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Knowing of the wetting of filler alloy on substrate is significant for brazing. Here, the isothermal wetting behavior of Sn-xCr alloys (x = 1, 2, 3, 4 and 5 wt%) on SiC substrates was studied by a modified sessile drop method in the temperature range of 1173 K–1323 K. The interfacial microstructures were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) and its evolution was analyzed thermodynamically. Also, the spreading kinetics is calculated and the formation of precursor film is discussed. The spreading of Sn melt on SiC consists of rapid-spreading and sluggish-spreading stages. A better wettability is obtained at higher Cr concentration and isothermal temperature. The direct reaction between Cr and SiC forming metallics Cr–C compounds (Cr3C2, Cr7C3 and Cr23C6) at the interface accounts for the improving wettability of Sn melt on SiC. More metallic Cr–C compound occupies a higher proportion of interfacial layer inducing a lower final contact angle. Temperature has a violent influence on the spreading kinetic constant Kr. The spreading activity energy is calculated to be 312 kJ/mol.
Zhenxing Fan; Min Guo; Wei Fu; Yidi Xue; Shengpeng Hu; Xiaoguo Song. Wettability and spreading behavior of Sn–Cr alloys on SiC. Materials Chemistry and Physics 2021, 272, 124979 .
AMA StyleZhenxing Fan, Min Guo, Wei Fu, Yidi Xue, Shengpeng Hu, Xiaoguo Song. Wettability and spreading behavior of Sn–Cr alloys on SiC. Materials Chemistry and Physics. 2021; 272 ():124979.
Chicago/Turabian StyleZhenxing Fan; Min Guo; Wei Fu; Yidi Xue; Shengpeng Hu; Xiaoguo Song. 2021. "Wettability and spreading behavior of Sn–Cr alloys on SiC." Materials Chemistry and Physics 272, no. : 124979.
Harvesting energy from ambient moisture and natural water sources is currently of great interest due to the need for standalone self-powered nano/micro-systems. In this work, we report on the development of a cost-effective nanogenerator based on a carbon paper-Al2O3 nanoparticle layer-carbon paper (CAC) sandwich structure, where the 3D Al2O3 layer is deposited via vacuum filtration. This type of device can produce an open-circuit voltage (UOC) of up to 4 V and a short-circuit current (ISC) of ∼18 μA with only an 8 μL water droplet applied. To our knowledge, this is the highest voltage yet reported from a single moisture/water-induced electricity nanogenerator using solid oxides and carbon-based materials. A remarkable output power of 14.8 μW can be reached with an optimized resistive load. An LED with a working voltage of 3–3.2 V can operate for a short time with the power from a single CAC device exposed to one 8 μL water droplet. Furthermore, a CAC generator adsorbing as little as 2 μL water droplets every 3 min can also give a UOC of 3.63 V. We show that CAC devices provide a robust electrical output over more than 200 wet–dry cycles without any deterioration in performance. These units demonstrate much promise as cost-effective electricity generators for harvesting energy from natural sources like rainwater, tap water, snow runoff, and dew. The response time of CAC devices can be as fast as 10–100 ms, making them ideal for applications as self-powered water detectors. The generation of power in this device arises from the streaming current. To assist in the optimization of these devices, we have analyzed how their response is related to such factors as layer thickness, time interval between application of water droplets, and the volume of each water droplet.
Xiaoye Zhao; Jiayun Feng; Ming Xiao; Daozhi Shen; Caiwang Tan; Xiaoguo Song; Jicai Feng; Walter W. Duley; Y. Norman Zhou. A Simple High Power, Fast Response Streaming Potential/Current-Based Electric Nanogenerator Using a Layer of Al2O3 Nanoparticles. ACS Applied Materials & Interfaces 2021, 13, 27169 -27178.
AMA StyleXiaoye Zhao, Jiayun Feng, Ming Xiao, Daozhi Shen, Caiwang Tan, Xiaoguo Song, Jicai Feng, Walter W. Duley, Y. Norman Zhou. A Simple High Power, Fast Response Streaming Potential/Current-Based Electric Nanogenerator Using a Layer of Al2O3 Nanoparticles. ACS Applied Materials & Interfaces. 2021; 13 (23):27169-27178.
Chicago/Turabian StyleXiaoye Zhao; Jiayun Feng; Ming Xiao; Daozhi Shen; Caiwang Tan; Xiaoguo Song; Jicai Feng; Walter W. Duley; Y. Norman Zhou. 2021. "A Simple High Power, Fast Response Streaming Potential/Current-Based Electric Nanogenerator Using a Layer of Al2O3 Nanoparticles." ACS Applied Materials & Interfaces 13, no. 23: 27169-27178.
Cast Al0.3CoCrFeNi high-entropy alloy was successfully bonded by Ni/Zr/Ni laminated foils using a transient liquid phase bonding method. When the bonding temperature exceeded 1140 °C, the active Zr atoms from Zr-Ni liquid alloy diffused into the grain boundaries and interdendritic region of the Al0.3CoCrFeNi base material and triggered a eutectic reaction with Al0.3CoCrFeNi in this region, which acted as a pseudo element. The formed liquid phase accelerated the dissolution of cast Al0.3CoCrFeNi base metal and a composite microstructure with the soft FCC Al0.3CoCrFeNi phase embedded into the brittle Ni7Zr2 intermetallic compound formed in the seam upon cooling. The mechanical performance of the joint was significantly affected by the bonding parameters. When the bonding was carried out at 1160 °C for 30 min, a joint with balanced ductility (face-centered cubic phase) and strength (Ni7Zr2) was obtained. The maximum shear strength of approximately 247 MPa was obtained. This value was approximately six times higher than that of the joint bonded at 1120 °C. The joints fractured in ductile interlamellar fracture mode.
Y. Lei; S.P. Hu; X.G. Song; Y. Luo; P.X. Li; J. Cao; G.D. Wang. Transient liquid phase bonding of cast Al0.3CoCrFeNi high-entropy alloy using Ni/Zr/Ni laminated foils. Journal of Alloys and Compounds 2021, 871, 159504 .
AMA StyleY. Lei, S.P. Hu, X.G. Song, Y. Luo, P.X. Li, J. Cao, G.D. Wang. Transient liquid phase bonding of cast Al0.3CoCrFeNi high-entropy alloy using Ni/Zr/Ni laminated foils. Journal of Alloys and Compounds. 2021; 871 ():159504.
Chicago/Turabian StyleY. Lei; S.P. Hu; X.G. Song; Y. Luo; P.X. Li; J. Cao; G.D. Wang. 2021. "Transient liquid phase bonding of cast Al0.3CoCrFeNi high-entropy alloy using Ni/Zr/Ni laminated foils." Journal of Alloys and Compounds 871, no. : 159504.
The surface properties is an important factor in the surface activated bonding of aluminum. The effect of argon (Ar) bombardment on the surface properties of aluminum was investigated in this work. The changes in surface chemical composition, wettability and structure were analyzed. The results revealed that the AlO bonds of surface oxide film were broken by Ar ion bombardment. The positive aluminum ions (Al+) and oxygen radicals (O*) produced by breaking of AlO bonds could react with the adsorbed water molecules to form hydrophilic hydroxyl (OH groups) and AlOH groups, which improved the wettability of aluminum surface. A large number of dislocations and subgrains with lattice distortion accumulated in the bombard-induced modification layer near the surface. The stress distribution on the surface was transformed from tensile stress into compressive stress with the bombardment power enhanced. The simulation results showed that the regular structure was broken and the point defects were produced from the collision. In the later stage of collision, most of the disordered atoms rearranged with the point defects annihilated, and finally a crater with several stable point defects was left near the surface.
Chaonan Niu; Jiangyue Han; Shengpeng Hu; Xiaoguo Song; Weimin Long; Duo Liu; Guodong Wang. Surface modification and structure evolution of aluminum under argon ion bombardment. Applied Surface Science 2020, 536, 147819 .
AMA StyleChaonan Niu, Jiangyue Han, Shengpeng Hu, Xiaoguo Song, Weimin Long, Duo Liu, Guodong Wang. Surface modification and structure evolution of aluminum under argon ion bombardment. Applied Surface Science. 2020; 536 ():147819.
Chicago/Turabian StyleChaonan Niu; Jiangyue Han; Shengpeng Hu; Xiaoguo Song; Weimin Long; Duo Liu; Guodong Wang. 2020. "Surface modification and structure evolution of aluminum under argon ion bombardment." Applied Surface Science 536, no. : 147819.
In this study, SiC/AlSi10Mg aluminum matrix composites (AMCs) were fabricated by laser metal deposition (LMD), and the effects of SiC content on microstructure, microhardness, wear performance and tensile properties were investigated. After LMD processing, the diffraction angle of the highest diffraction peak of the α-Al phase changed from 38.470° to 44.833°, demonstrating a clear preferred orientation. Si and Mg elements gathered at the grain boundaries in form of Si and Mg2Si phases. The presence of SiC promoted the aggregation of Fe elements, forming the needle-like Al-Fe-Si eutectic phase. As the SiC content increased, the grain size of the middle area decreased and the randomness of the texture distribution increased. Furthermore, the AMCs with 2wt.% SiC exhibited impressive comprehensive performances, i.e., microhardness of 117.06 HV, a wear rate of 1.84×10−3 mm3N-1m-1 and tensile strength of 219.04MPa. The wear resistance was improved and the wear mechanism changed from adhesive wear to abrasive wear with the addition of SiC participles.
Xin Xi; Bo Chen; Caiwang Tan; Xiaoguo Song; Jicai Feng. Microstructure and mechanical properties of SiC reinforced AlSi10Mg composites fabricated by laser metal deposition. Journal of Manufacturing Processes 2020, 58, 763 -774.
AMA StyleXin Xi, Bo Chen, Caiwang Tan, Xiaoguo Song, Jicai Feng. Microstructure and mechanical properties of SiC reinforced AlSi10Mg composites fabricated by laser metal deposition. Journal of Manufacturing Processes. 2020; 58 ():763-774.
Chicago/Turabian StyleXin Xi; Bo Chen; Caiwang Tan; Xiaoguo Song; Jicai Feng. 2020. "Microstructure and mechanical properties of SiC reinforced AlSi10Mg composites fabricated by laser metal deposition." Journal of Manufacturing Processes 58, no. : 763-774.
Grid pattern was textured on Ti-6Al-4V alloy (TC4) substrate surface by nanosecond laser system. Laser joining of carbon fiber reinforced thermoplastic composite (CFRTP) to TC4 joints were performed, and the effect of texture grid depth was investigated. The contact angle of molten CFRTP on textured TC4 surface was measured and the tensile-shear force was tested. The fracture surface and interface morphology were observed. The results indicated that the wettability of molten CFRTP on TC4 surface improved remarkably after laser textured TC4. Shear force of CFRTP/TC4 joints was increased by 156% after laser textured TC4 surface. When the depth of grid was deeper than 100 μm, contact angle increased and incomplete filling of molten CFRTP in grid occurred, the shear force thus decreased gradually. Resin-carbon fibers mixture was adhered on the fracture surface of TC4, and the variation tendency of adhesion ratio was consistent with that of shear force. TC4 matrix was exfoliated from substrate and adhered at the fracture surface of CFRTP, indicating stronger mechanical interlocking occurred at the joining interface after laser textured TC4 surface. Beside mechanical interlocking, compound layer consisted of CTi0.42V1.58 carburization phase was also confirmed at interface, suggesting that chemical bonding also occurred at the joining interface.
Caiwang Tan; Jianhui Su; Ziwei Feng; Yifan Liu; Bo Chen; Xiaoguo Song. Laser joining of CFRTP to titanium alloy via laser surface texturing. Chinese Journal of Aeronautics 2020, 34, 103 -114.
AMA StyleCaiwang Tan, Jianhui Su, Ziwei Feng, Yifan Liu, Bo Chen, Xiaoguo Song. Laser joining of CFRTP to titanium alloy via laser surface texturing. Chinese Journal of Aeronautics. 2020; 34 (5):103-114.
Chicago/Turabian StyleCaiwang Tan; Jianhui Su; Ziwei Feng; Yifan Liu; Bo Chen; Xiaoguo Song. 2020. "Laser joining of CFRTP to titanium alloy via laser surface texturing." Chinese Journal of Aeronautics 34, no. 5: 103-114.
In this work, chromium coating conducted by magnetron sputtering was introduced to braze SiC ceramics using inactive AgCu filler metal. The results showed that reliable metallurgical bonding of SiC ceramics was obtained at 900°C for 10min. SEM, XRD and TEM were used to identify the reaction phase in the joint, and the typical interfacial microstructure was SiC / mixed CrSi2+Cr23C6 layer / CrSi2 / Ag(s,s) + Cu(s,s) / CrSi2 / mixed CrSi2+Cr23C6 layer / SiC. The shear strength of SiC joint using chromium coating brazed with inactive AgCu filler metal was 29.6MPa and the joint fractured at the SiC substrate entirely after shear test. The proposed active element coating method provides a feasible way to achieve the brazing of ceramics.
Zubin Chen; Shengpeng Hu; Xiaoguo Song; Yu Lei; Xinyuan Wang; Weimin Long; Jicai Feng. Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal. International Journal of Applied Ceramic Technology 2020, 17, 2591 -2597.
AMA StyleZubin Chen, Shengpeng Hu, Xiaoguo Song, Yu Lei, Xinyuan Wang, Weimin Long, Jicai Feng. Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal. International Journal of Applied Ceramic Technology. 2020; 17 (6):2591-2597.
Chicago/Turabian StyleZubin Chen; Shengpeng Hu; Xiaoguo Song; Yu Lei; Xinyuan Wang; Weimin Long; Jicai Feng. 2020. "Brazing of SiC ceramics pretreated by chromium coating using inactive AgCu filler metal." International Journal of Applied Ceramic Technology 17, no. 6: 2591-2597.
Titanium and zirconia (ZrO2) ceramics are widely used in biomedical fields. This study aims to achieve reliable brazed joints of titanium/ZrO2 using biocompatible Au filler for implantable medical products. The effects of brazing temperature and holding time on the interfacial microstructures and mechanical properties of titanium/Au/ZrO2 joints were fully investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results indicated that the typical interfacial microstructure of the titanium/Au/ZrO2 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/TiO layer/ZrO2 ceramic. With an increasing brazing temperature or holding time, the thickness of the Ti3Au + TiAu + TiAu2 layer increased gradually. The growth of the TiO layer was observed, which promoted metallurgical bonding between the filler metal and ZrO2 ceramic. The optimal shear strength of ~35.0 MPa was obtained at 1150 °C for 10 min. SEM characterization revealed that cracks initiated and propagated along the interface of TiAu2 and TiAu4 reaction layers.
Yuzhen Lei; Hong Bian; Wei Fu; Xiaoguo Song; Jicai Feng; Weimin Long; Hongwei Niu. Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties. Metals 2020, 10, 526 .
AMA StyleYuzhen Lei, Hong Bian, Wei Fu, Xiaoguo Song, Jicai Feng, Weimin Long, Hongwei Niu. Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties. Metals. 2020; 10 (4):526.
Chicago/Turabian StyleYuzhen Lei; Hong Bian; Wei Fu; Xiaoguo Song; Jicai Feng; Weimin Long; Hongwei Niu. 2020. "Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties." Metals 10, no. 4: 526.
Reliable SiC/Sn-Ti/SiC joints were obtained by brazing (950 °C/10 min) and soldering (250 °C/2 min) following premetallization depend on the wettability of Sn-Ti on SiC. The microstructures of Sn-Ti/SiC interface were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy, and the mechanical properties of joints were evaluated by shear tests. Active Ti enhanced the wettability of Sn on SiC with the decrease of contact angle from 150° to 20°. Ti direct reacted with SiC to produce TiC and combines with released Si forming Ti5Si3. Much lower Ti concentration per contacting area in brazing and metallization, compared to wetting, resulted in defective bonding of Sn-Ti/SiC and few amounts of interfacial products (thin TiC layer or partial covered TiC layer with Ti5Si3). All of the SiC/SiC joints possess a similar shear strength of 27–32 MPa and rupture through β-Sn matrix in ductile fracture.
Wei Fu; Xiaoguo Song; Ruichen Tian; Yuzhen Lei; Weimin Long; Sujuan Zhong; Jicai Feng. Wettability and joining of SiC by Sn-Ti: Microstructure and mechanical properties. Journal of Materials Science & Technology 2019, 40, 15 -23.
AMA StyleWei Fu, Xiaoguo Song, Ruichen Tian, Yuzhen Lei, Weimin Long, Sujuan Zhong, Jicai Feng. Wettability and joining of SiC by Sn-Ti: Microstructure and mechanical properties. Journal of Materials Science & Technology. 2019; 40 ():15-23.
Chicago/Turabian StyleWei Fu; Xiaoguo Song; Ruichen Tian; Yuzhen Lei; Weimin Long; Sujuan Zhong; Jicai Feng. 2019. "Wettability and joining of SiC by Sn-Ti: Microstructure and mechanical properties." Journal of Materials Science & Technology 40, no. : 15-23.
Ar ion bombardment was conducted to modify the SiC surface microstructures, which had a vital effect on the interfacial microstructure and shear property of brazing joints. The amorphous layer with thickness of ∼120 nm was formed on the bombarded surface, accompanied with plenty of dislocations and twins beneath the amorphous layer. Reliable SiC/AgCu-Ti/SiC joints were brazed in vacuum at 900 °C for 10 min, and the interfacial microstructure was investigated by SEM, EDS and TEM in detail. When the ion bombarded SiC was used as substrates, the microstructure of brazing beam was optimized as SiC / Ti5Si3 + TiC mixed layer / Ag(s,s) + Cu(s,s) containing TiCu / Ti5Si3 + TiC mixed layer / SiC, in which the interfacial stratification was eliminated compared to the conventional SiC brazing. The shear strength was improved to 30.9 MPa with ion bombardment, which was ∼72.6 % higher than that of the original SiC joints without ion bombardment. The proposed Ar ion bombardment method provides a novel way to modify the brazability of ceramics.
Z.B. Chen; S.P. Hu; X.K. Duan; M. Dan; X.G. Song; W.M. Long; J.C. Feng. Study of ion bombardment of SiC ceramics: Surface and interfacial reaction modification. Journal of the European Ceramic Society 2019, 40, 1005 -1013.
AMA StyleZ.B. Chen, S.P. Hu, X.K. Duan, M. Dan, X.G. Song, W.M. Long, J.C. Feng. Study of ion bombardment of SiC ceramics: Surface and interfacial reaction modification. Journal of the European Ceramic Society. 2019; 40 (4):1005-1013.
Chicago/Turabian StyleZ.B. Chen; S.P. Hu; X.K. Duan; M. Dan; X.G. Song; W.M. Long; J.C. Feng. 2019. "Study of ion bombardment of SiC ceramics: Surface and interfacial reaction modification." Journal of the European Ceramic Society 40, no. 4: 1005-1013.
High-entropy alloy Al0.85CoCrFeNi was joined to TiAl alloy through vacuum diffusion bonding. The typical interfacial microstructure of Al0.85CoCrFeNi/TiAl joint was TiAl/ α2-Ti3Al + solid solution strengthened γ-TiAl / FeNi, AlNiTi / Al(Co, Ni)2Ti /Cr(Fe, Co)ss / Al0.85CoCrFeNi. The formation of Al(Co, Ni)2Ti phase and Cr(Fe, Co)ss layer was result from the diffusion of Ni and Co atoms from Al0.85CoCrFeNi into TiAl substrate and the accumulation of Fe and Cr atoms at the Al0.85CoCrFeNi side. The effects of joining temperature and holding time on the microstructure and mechanical properties of joints were revealed. The joint with the maximum shear strength of ∼70 MPa was obtained at the joining temperature of 850 °C for 1.5 h under pressure of 30 MPa. The fracture path was deflected from solid strengthened γ-TiAl layer where FeNi, AlNiTi existed to Cr(Fe, Co)ss layer.
Y. Lei; S.P. Hu; T.L. Yang; X.G. Song; Y. Luo; G.D. Wang. Vacuum diffusion bonding of high-entropy Al0.85CoCrFeNi alloy to TiAl intermetallic. Journal of Materials Processing Technology 2019, 278, 116455 .
AMA StyleY. Lei, S.P. Hu, T.L. Yang, X.G. Song, Y. Luo, G.D. Wang. Vacuum diffusion bonding of high-entropy Al0.85CoCrFeNi alloy to TiAl intermetallic. Journal of Materials Processing Technology. 2019; 278 ():116455.
Chicago/Turabian StyleY. Lei; S.P. Hu; T.L. Yang; X.G. Song; Y. Luo; G.D. Wang. 2019. "Vacuum diffusion bonding of high-entropy Al0.85CoCrFeNi alloy to TiAl intermetallic." Journal of Materials Processing Technology 278, no. : 116455.
The influence of laser texturing on the bonding property of 30CrMnSiA steel joints were investigated. Three patterns including dimple, groove and grid were laser textured on the 30CrMnSiA steel substrate by nanosecond fiber laser. The processed surface was characterized by surface morphology, surface roughness (Ra and Rz) and wettability. The single lap adhesive joints were fabricated and fracture surfaces were observed. The accelerated hygrothermal aging experiments were performed. The results indicated that surface roughness and wettability were both enhanced after laser texturing. The grid patterned substrate was improved pronouncedly, where Ra increased by 400% and Rz was 13 times higher than as-received specimens, and the contact angle was decreased from 65° to 24°. The shear strength of adhesive joints for dimple pattern was not improved evidently, while it was 14.6 MPa and 23.3 MPa in the groove and grid patterned specimens, which was increased by 219%, 348% compared to as-received ones, respectively. The coverage of adhesive layer on the fracture surface was increased and the fracture mode of dimple and groove patterned specimens was adhesive failure and a cohesive failure was achieved for those joints with grid pattern. The bonding property was decreased after hygrothermal aging, and the residual strength of specimens with grid pattern was the highest. The fracture mode was not changed in all adhesive joints.
Ziwei Feng; Hongyun Zhao; Caiwang Tan; Baohua Zhu; Fengbin Xia; Qiang Wang; Bo Chen; Xiaoguo Song. Effect of laser texturing on the surface characteristics and bonding property of 30CrMnSiA steel adhesive joints. Journal of Manufacturing Processes 2019, 47, 219 -228.
AMA StyleZiwei Feng, Hongyun Zhao, Caiwang Tan, Baohua Zhu, Fengbin Xia, Qiang Wang, Bo Chen, Xiaoguo Song. Effect of laser texturing on the surface characteristics and bonding property of 30CrMnSiA steel adhesive joints. Journal of Manufacturing Processes. 2019; 47 ():219-228.
Chicago/Turabian StyleZiwei Feng; Hongyun Zhao; Caiwang Tan; Baohua Zhu; Fengbin Xia; Qiang Wang; Bo Chen; Xiaoguo Song. 2019. "Effect of laser texturing on the surface characteristics and bonding property of 30CrMnSiA steel adhesive joints." Journal of Manufacturing Processes 47, no. : 219-228.
By coating active titanium, Sn0.3Ag0.7Cu (SAC) filler wetted SiC effectively, as the contact angle decreased significantly from ~145° to ~10°. Ti3SiC2 and TiOx (x ≤ 1) reaction layers were formed at the droplet/SiC interface, leading to the reduction of contact angle. Reliable brazing of SiC was achieved using titanium deposition at 900°C for 10 minutes, and the typical interfacial microstructure of Ti‐coated SiC/SAC was SiC/TiOx + Ti3SiC2/Sn(s,s). Comparing to direct brazing, Ti–Sn compounds in the brazing seam were effectively reduced and the mechanical property of joints was dramatically improved by titanium coating. The optimal average shear strength of SiC joints reached 25.3 MPa using titanium coating‐ assisted brazing, which was ∼62% higher than that of SiC brazed joints using SAC‐Ti filler directly.
Xiaoguo Song; Zubin Chen; Shengpeng Hu; Xiaokang Duan; Yuzhen Lei; Chaonan Niu; Jicai Feng. Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler. Journal of the American Ceramic Society 2019, 1 .
AMA StyleXiaoguo Song, Zubin Chen, Shengpeng Hu, Xiaokang Duan, Yuzhen Lei, Chaonan Niu, Jicai Feng. Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler. Journal of the American Ceramic Society. 2019; ():1.
Chicago/Turabian StyleXiaoguo Song; Zubin Chen; Shengpeng Hu; Xiaokang Duan; Yuzhen Lei; Chaonan Niu; Jicai Feng. 2019. "Wetting behavior and brazing of titanium‐coated SiC ceramics using Sn0.3Ag0.7Cu filler." Journal of the American Ceramic Society , no. : 1.
30CrMnSiA steel substrate was treated with sandblasting and laser texturing to improve its adhesive-bonded strength. The characterization of treated substrate was performed by surface morphology, surface roughness (Ra and Rz) and wettability. The water contact angle (WCA) was measured and solid surface energy was calculated. The adhesive-bonded single lap joints were then prepared and tested. For comparison, the similar discussion was established for the metal substrate with degreasing. Fracture surface was observed and analyzed by SEM and EDS. The results indicated that the surface roughness was increased both with sandblasting and laser texturing. The wettability was improved due to the decrease of WCA and the increase of surface energy. The tensile shear strength of adhesive-bonded joints after sandblasting and laser texturing increased by 151% and 465.9% respectively. The proportion of adhesive on the same side (left side) of joints was 1.5%,29.3% and 67.7% under three types of joints. The fracture mode of specimens with degreased and sandblasted substrate was found to be an interfacial fracture, while it was mixed fracture with laser textured substrate.
Ziwei Feng; Hongyun Zhao; Caiwang Tan; Jun Chen; Yong Wang; Bo Chen; Xiaoguo Song. Modification of surface treatment on the strength of 30CrMnSiA steel adhesively bonded joints. Materials Research Express 2019, 6, 116521 .
AMA StyleZiwei Feng, Hongyun Zhao, Caiwang Tan, Jun Chen, Yong Wang, Bo Chen, Xiaoguo Song. Modification of surface treatment on the strength of 30CrMnSiA steel adhesively bonded joints. Materials Research Express. 2019; 6 (11):116521.
Chicago/Turabian StyleZiwei Feng; Hongyun Zhao; Caiwang Tan; Jun Chen; Yong Wang; Bo Chen; Xiaoguo Song. 2019. "Modification of surface treatment on the strength of 30CrMnSiA steel adhesively bonded joints." Materials Research Express 6, no. 11: 116521.
In this work, carbon fiber was introduced into the Ag-26.7Cu-4.5Ti (wt%) filler to optimize brazed joints by participating in brazing reaction process. The interfacial microstructure was analyzed by SEM and TEM, the effects of carbon fiber content on the microstructure and mechanical property of brazed joints were studied, the formation of brazing interface was systematically discussed, and the action mechanism of carbon fiber was illustrated. Experimental results demonstrated that carbon fiber reacted with Ti to generate TiC during the brazing process, and formed a structure of carbon fiber wrapped by TiC and Ti-Cu compounds (TiCu+Ti3Cu4). Due to competitive reaction between carbon fiber and Cu to Ti, the formation of bulk Ti3Cu4 and TiCu4 was inhibited, while the formation of Cu-based solid solution was promoted. The microstructure of joints was dispersed as the increase of carbon fiber. The maximum shear strength of 27.8 MPa was achieved when 0.3 wt% carbon fiber was added into AgCuTi filler. The reinforcing effects of carbon fiber were mainly to relieve the residual stress generated by CTE mismatch and reduce the thickness of brittle TiC layer close to C/C composite. However, excessive carbon fiber would deteriorate the joints because of the insufficient reaction between filler and C/C composite.
Duo Liu; Kehan Zhao; Yanyu Song; Lei Zhang; Xiaoguo Song; Weimin Long. Effect of introducing carbon fiber into AgCuTi filler on interfacial microstructure and mechanical property of C/C-TC4 brazed joints. Materials Characterization 2019, 157, 109890 .
AMA StyleDuo Liu, Kehan Zhao, Yanyu Song, Lei Zhang, Xiaoguo Song, Weimin Long. Effect of introducing carbon fiber into AgCuTi filler on interfacial microstructure and mechanical property of C/C-TC4 brazed joints. Materials Characterization. 2019; 157 ():109890.
Chicago/Turabian StyleDuo Liu; Kehan Zhao; Yanyu Song; Lei Zhang; Xiaoguo Song; Weimin Long. 2019. "Effect of introducing carbon fiber into AgCuTi filler on interfacial microstructure and mechanical property of C/C-TC4 brazed joints." Materials Characterization 157, no. : 109890.
Medical titanium and alumina (Al2O3) bioceramic are widely utilized as biomaterials. A reliable brazed joint of titanium and alumina was successfully obtained using biocompatible Au foil for implantable devices in the present study. The interfacial microstructure and reaction products of titanium/Au/Al2O3 joints brazed under different conditions were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). In this study, the typical interfacial microstructure of the titanium/Au/Al2O3 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/Au + granular TiAu4 layer/TiOx phase/Al2O3 ceramic. With increasing brazing temperature or holding time, the thicknesses of Ti3Au + TiAu + TiAu2 layers adjacent to the titanium substrate increased gradually. Shear tests indicated that the joint brazed at 1115 °C for 3 min exhibited the highest shear strength of 39.2 MPa. Typical fracture analysis displayed that the crack started at the Al2O3 ceramic and propagated along the interface of TiAu2 and TiAu4 reaction layers.
Hong Bian; Xiaoguo Song; Shengpeng Hu; Yuzhen Lei; Yide Jiao; Shutong Duan; Jicai Feng; Weimin Long. Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants. Metals 2019, 9, 644 .
AMA StyleHong Bian, Xiaoguo Song, Shengpeng Hu, Yuzhen Lei, Yide Jiao, Shutong Duan, Jicai Feng, Weimin Long. Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants. Metals. 2019; 9 (6):644.
Chicago/Turabian StyleHong Bian; Xiaoguo Song; Shengpeng Hu; Yuzhen Lei; Yide Jiao; Shutong Duan; Jicai Feng; Weimin Long. 2019. "Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants." Metals 9, no. 6: 644.
Residual stress in ceramic‐metal joints is always a big issue that would adversely affect the mechanical properties of the joints. Herein, in‐situ particles reinforced brazing technique by utilizing AgCuTi filler metal incorporated with graphene nanoplatelets (GNPs) has been developed for joining SiC ceramic and GH99 surperalloy. TiC nanocrystalline particles were synthesized on the surface of GNPs through the Ti‐GNPs reaction. GNPs equipped with TiC particles released the residual stress in the joints due to the inherent low coefficient of thermal expansion (CTE) characteristic. The microstructure evolution of the joints as a function of brazing temperature was investigated; it realized the control for in‐situ reaction and the diffusion behavior of Ni which played an important role in mechanical properties of the joints. The joints strength increased as the brazing temperature increased up to 860 °C due to the higher fraction of TiC particles. Ti2Ni intermetallic compound formed in the joint interfacial region when the brazing temperature was higher than or equal to 860 °C; it destroyed the graded CTE composite structure and induced the stress concentration in the joints, which led to poorer performance. This article is protected by copyright. All rights reserved.
Yanyu Song; Duo Liu; Xiaoguo Song; Shengpeng Hu; Jian Cao. In‐situ synthesis of TiC nanoparticles during joining of SiC ceramic and GH99 superalloy. Journal of the American Ceramic Society 2019, 102, 6529 -6541.
AMA StyleYanyu Song, Duo Liu, Xiaoguo Song, Shengpeng Hu, Jian Cao. In‐situ synthesis of TiC nanoparticles during joining of SiC ceramic and GH99 superalloy. Journal of the American Ceramic Society. 2019; 102 (11):6529-6541.
Chicago/Turabian StyleYanyu Song; Duo Liu; Xiaoguo Song; Shengpeng Hu; Jian Cao. 2019. "In‐situ synthesis of TiC nanoparticles during joining of SiC ceramic and GH99 superalloy." Journal of the American Ceramic Society 102, no. 11: 6529-6541.
A two-step process involving, first, the pre-metallization of the SiC ceramic, followed by the vacuum brazing using graphene nanoplatelets (GNPs) reinforced AgCuTi composite filler was developed to join SiC ceramic and GH99 superalloy. The metallization characteristics, joint microstructure and fracture behavior were investigated. Through pre-metallization, a smooth metallic coating formed on the SiC ceramic surface; the carbide layer adjacent to SiC ceramic had a semi-coherent interface with it. Brazing process showed that in situ synthesized TiC particles with fine-grains were evenly dispersed in the filler matrix due to GNPs acting as nucleation sites, promoting the refinement of microstructure of the joint. Moreover, the effect of GNPs in retarding the diffusion of metal atoms limited the reaction of Ti with Cu and Ni, thereby reducing the negative impact induced by the brittle compounds. The maximum shear strength of 26.4 MPa was obtained at AgCuTi-1%GNPs, which was ∼151.4% higher than the joint brazed using AgCuTi filler.
Yanyu Song; Duo Liu; Shengpeng Hu; Xiaoguo Song; Yuzhen Lei; Jian Cao. Brazing of metallized SiC ceramic to GH99 superalloy using graphene nanoplatelets reinforced AgCuTi composite filler. Ceramics International 2019, 45, 8962 -8970.
AMA StyleYanyu Song, Duo Liu, Shengpeng Hu, Xiaoguo Song, Yuzhen Lei, Jian Cao. Brazing of metallized SiC ceramic to GH99 superalloy using graphene nanoplatelets reinforced AgCuTi composite filler. Ceramics International. 2019; 45 (7):8962-8970.
Chicago/Turabian StyleYanyu Song; Duo Liu; Shengpeng Hu; Xiaoguo Song; Yuzhen Lei; Jian Cao. 2019. "Brazing of metallized SiC ceramic to GH99 superalloy using graphene nanoplatelets reinforced AgCuTi composite filler." Ceramics International 45, no. 7: 8962-8970.
In this study, the low‐temperature ultrasound‐activated joining of ZrO2 ceramics using Sn–4Al–0.7Cu solder was achieved at 350°C. It was found that a nanoscale amorphous Al2O3 layer formed at the solder‐ceramic interface during the ultrasonic soldering process. The occurrence of the interfacial oxidation of aluminum could be attributed to the sonochemical effects of acoustic cavitation and turbulent streaming induced by the propagation of ultrasonic waves in the liquid solder. The formed butt joints exhibited an average tensile strength of 47.3 MPa.
Hongjie Dong; Zhuolin Li; Xiaoguo Song; Xiajun Guo; Yanxu Luo; Tiansheng Bai; Shoujing Wei; Hongyun Zhao; Jiuchun Yan; Jicai Feng. Low-temperature ultrasound-activated joining of ZrO2 ceramics using Sn-Al-Cu solder. Journal of the American Ceramic Society 2018, 102, 2272 -2277.
AMA StyleHongjie Dong, Zhuolin Li, Xiaoguo Song, Xiajun Guo, Yanxu Luo, Tiansheng Bai, Shoujing Wei, Hongyun Zhao, Jiuchun Yan, Jicai Feng. Low-temperature ultrasound-activated joining of ZrO2 ceramics using Sn-Al-Cu solder. Journal of the American Ceramic Society. 2018; 102 (5):2272-2277.
Chicago/Turabian StyleHongjie Dong; Zhuolin Li; Xiaoguo Song; Xiajun Guo; Yanxu Luo; Tiansheng Bai; Shoujing Wei; Hongyun Zhao; Jiuchun Yan; Jicai Feng. 2018. "Low-temperature ultrasound-activated joining of ZrO2 ceramics using Sn-Al-Cu solder." Journal of the American Ceramic Society 102, no. 5: 2272-2277.
The reactive wetting behavior of zirconia with SnAgCu-x%Ti (SAC-x%Ti, wt. %, x=1, 4) alloy was investigated via the sessile drop method in isothermal experiments. As temperatures elevated, the final contact angle decreased and the minimum contact angle of 21° and 7° were obtained at 1000 °C for SAC-1%Ti and SAC-4%Ti droplets, respectively. Kinetic calculations indicated that the spreading of SAC-Ti droplets on zirconia was controlled by interfacial reaction and the wetting activation energy was 108.8 kJ/mol. The reaction products distribution and morphology in droplets were influenced vastly by the addition of Ti. Along with the increase of Ti content from 1% to 4%, a great deal of Ti-Sn intermetallic compounds (IMCs) were generated in droplets, thereby the outline of droplets were transformed from hemispherical into similar trapezoidal due to the limited spreading and fluidity of droplets. Owing to the interfacial reaction between active elements Ti and zirconia and the subsequent formation of the Ti-O layer, the wettability of SAC-Ti/zirconia was greatly promoted. According to transmission electron microscopy (TEM) analysis, the thin Ti-O reaction layer consisted of the Ti2O, Ti4O7, Ti7O13 and TiO2 phase.
Hong Bian; Yuexin Zhou; Xiaoguo Song; Shengpeng Hu; Bin Shi; Jiarui Kang; Jicai Feng. Reactive wetting and interfacial characterization of ZrO2 by SnAgCu-Ti alloy. Ceramics International 2018, 45, 6730 -6737.
AMA StyleHong Bian, Yuexin Zhou, Xiaoguo Song, Shengpeng Hu, Bin Shi, Jiarui Kang, Jicai Feng. Reactive wetting and interfacial characterization of ZrO2 by SnAgCu-Ti alloy. Ceramics International. 2018; 45 (6):6730-6737.
Chicago/Turabian StyleHong Bian; Yuexin Zhou; Xiaoguo Song; Shengpeng Hu; Bin Shi; Jiarui Kang; Jicai Feng. 2018. "Reactive wetting and interfacial characterization of ZrO2 by SnAgCu-Ti alloy." Ceramics International 45, no. 6: 6730-6737.