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The influence of enhanced gravity on the microstructure and mechanical properties of the Al0.9CoCrFeNi high-entropy alloy, which was solidified under normal gravity (acceleration 1 g) and enhanced gravity (acceleration 140 g, acceleration 210 g, and acceleration 360 g) conditions is reported in this paper. Its solidification under enhanced gravity fields resulted in refinement of the columnar nondendritic grain structure and an increase in the area fraction of the body-centered cubic (BCC) structure phases. The mass transfer strengthened by enhanced gravity promoted element diffusion and enrichment, which caused changes in the composition and microstructure that, in turn, affected the mechanical properties of the alloy. The compressive strength and plasticity of the sample solidified at acceleration 360 g were equal to 2845 MPa and 36.4%, respectively, which are the highest values reported to date for Al0.9CoCrFeNi alloy.
Anjun Shi; Ruixuan Li; Yong Zhang; Zhe Wang; Zhancheng Guo. Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al0.9CoCrFeNi High-Entropy Alloy. Entropy 2020, 22, 1318 .
AMA StyleAnjun Shi, Ruixuan Li, Yong Zhang, Zhe Wang, Zhancheng Guo. Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al0.9CoCrFeNi High-Entropy Alloy. Entropy. 2020; 22 (11):1318.
Chicago/Turabian StyleAnjun Shi; Ruixuan Li; Yong Zhang; Zhe Wang; Zhancheng Guo. 2020. "Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al0.9CoCrFeNi High-Entropy Alloy." Entropy 22, no. 11: 1318.
Supergravity technology is an efficient method for the separation of trace elements from Al-Mg alloys made of their scraps. This study investigated the enrichment and separation behavior of impurities from Al-Mg alloy using supergravity technology under various conditions. After supergravity enrichment, nonmetallic inclusions and precipitated intermetallic compounds were concentrated at the bottom of the samples, and the enrichment degree positively correlated with the gravity coefficient. High-purity Al-Mg alloys was obtained with efficient impurity removal from the alloy melt of the scraps by filtration in supergravity fields. Improving the gravity coefficient benefited the recoveries of the Al and Mg but had little influence on the purity of the obtained Al-Mg alloy. Although the recoveries of the Al and Mg increased slightly with increasing the separation temperature, the removal rates of the metallic impurities were relatively low at elevated temperatures. At the temperature of 500 °C, gravity coefficient of 600, and separation time of 1 min, 91.6% and 90.1% of Al and Mg were recovered, respectively. Their corresponding mass fractions in the filtered Al-Mg alloy were 99.2 wt%. An amplified experimental centrifugal separation apparatus was also designed for purifying the alloys on an engineering scale. The results indicate that supergravity technology is feasible on an industrial scale and that it can be potentially employed as a separation and purification process.
Long Meng; Zhe Wang; Lu Wang; Lei Guo; Zhancheng Guo. Novel and efficient purification of scrap Al-Mg alloys using supergravity technology. Waste Management 2020, 119, 22 -29.
AMA StyleLong Meng, Zhe Wang, Lu Wang, Lei Guo, Zhancheng Guo. Novel and efficient purification of scrap Al-Mg alloys using supergravity technology. Waste Management. 2020; 119 ():22-29.
Chicago/Turabian StyleLong Meng; Zhe Wang; Lu Wang; Lei Guo; Zhancheng Guo. 2020. "Novel and efficient purification of scrap Al-Mg alloys using supergravity technology." Waste Management 119, no. : 22-29.
The recovery of zinc from galvanizing dross and the removal of iron contained dross particles by gas pressure filtration were investigated using the model of Zn–Fe–Al alloys. The majority of molten zinc was separated after filtration, and the residue intercepted by the filter consisting mostly of dross particles. The effects of the pressure differential (p), separation temperature (T) and alloy composition on the zinc recovery and iron removal were investigated. At p = 0.30 MPa and T = 723 K, 86.2 wt.% zinc was recovered from the Zn–4Al–2Fe alloy, and up to 99.9 wt.% of the iron was concentrated in the residue. Applying a higher pressure differential led to the improved filtration efficiency, and the desired separation temperature was about 723 K. The aluminum content in the Zn–Al–Fe alloy had little effect on separation efficiency, whereas increasing the iron content led to a decrease in the separation efficiency. Our findings demonstrate the potential of the gas pressure filtration method for the recovery of zinc from galvanizing dross.
Tian-Yang Li; Zhe Wang; Lei Guo; Zhan-Cheng Guo. Recovery of zinc from Zn–Al–Fe alloys by gas pressure filtration. Journal of Iron and Steel Research International 2020, 27, 1322 -1330.
AMA StyleTian-Yang Li, Zhe Wang, Lei Guo, Zhan-Cheng Guo. Recovery of zinc from Zn–Al–Fe alloys by gas pressure filtration. Journal of Iron and Steel Research International. 2020; 27 (11):1322-1330.
Chicago/Turabian StyleTian-Yang Li; Zhe Wang; Lei Guo; Zhan-Cheng Guo. 2020. "Recovery of zinc from Zn–Al–Fe alloys by gas pressure filtration." Journal of Iron and Steel Research International 27, no. 11: 1322-1330.
A supergravity-induced separation method was proposed to recover matrix alloy and SiC particles from scrap aluminum matrix composites (AMCs). Effects of the gravity coefficient (G), temperature (T), and separation time (t) on the separation efficiencies were evaluated and the corresponding separation mechanism was analyzed. Under optimum conditions (T = 710 °C, G = 600, and t = 300 s), the recovery rates of Al and SiC reached 83.9 and 98.2%, respectively. The theoretical calculated separating efficiencies based on the capillary law were in good consistent with the observed values. At 710 °C, the interfacial reaction between liquid Al and SiC that produced Al4C3 and free Si was limited. A small amount of Al4C3 was retained in the residue. After removing Al4C3 and excess metallic Al from the residue by acid pickling, the SiC particles were thoroughly recovered and could be directly reused as fresh reinforcements. Moreover, an amplified centrifugal separation apparatus was conceptually designed for recycling AMC scraps on an engineering scale. Preliminary results indicate that supergravity technology can be potentially employed as a practical process for recovering reinforcements and matrix alloy from scrap AMCs.
Ningjie Sun; Zhe Wang; Lei Guo; Lu Wang; Zhancheng Guo. Efficient separation of reinforcements and matrix alloy from aluminum matrix composites by supergravity technology. Journal of Alloys and Compounds 2020, 843, 155814 .
AMA StyleNingjie Sun, Zhe Wang, Lei Guo, Lu Wang, Zhancheng Guo. Efficient separation of reinforcements and matrix alloy from aluminum matrix composites by supergravity technology. Journal of Alloys and Compounds. 2020; 843 ():155814.
Chicago/Turabian StyleNingjie Sun; Zhe Wang; Lei Guo; Lu Wang; Zhancheng Guo. 2020. "Efficient separation of reinforcements and matrix alloy from aluminum matrix composites by supergravity technology." Journal of Alloys and Compounds 843, no. : 155814.
In this study, the purification of metallurgical-grade silicon using a combination of solvent refining and gas pressure filtration was investigated in the Sn–Si alloy.
Tianyang Li; Lei Guo; Zhe Wang; Zhancheng Guo. Purification of metallurgical-grade silicon combining Sn–Si solvent refining with gas pressure filtration. RSC Advances 2020, 10, 11435 -11443.
AMA StyleTianyang Li, Lei Guo, Zhe Wang, Zhancheng Guo. Purification of metallurgical-grade silicon combining Sn–Si solvent refining with gas pressure filtration. RSC Advances. 2020; 10 (19):11435-11443.
Chicago/Turabian StyleTianyang Li; Lei Guo; Zhe Wang; Zhancheng Guo. 2020. "Purification of metallurgical-grade silicon combining Sn–Si solvent refining with gas pressure filtration." RSC Advances 10, no. 19: 11435-11443.
The in-situ reaction method for preparing metal matrix composites (MMCs) features the advantages like simple process, good combination of reinforcing phase and matrix, and it is especially suitable for the fabrication of TiCx reinforced copper matrix composites. In this study, the in-situ reaction method with CuxTi melt and dissolvable solid carbon was used to prepare the Cu-based TiCx composites. A uniformly dispersed TiCx particulate phase was obtained in the metal matrix, and they were tightly bonded. For the sample with the TiCx volume fraction of 26.2 vol%, the stoichiometry of the TiCx phase obtained was very close to 1, the flexural strength, the micro hardness and the thermal expansion coefficient reached 600 MPa, 360 HV and 12 × 10−6 °C−1 respectively. The in-situ reaction mechanism of carbon source particles in CuxTi alloy melt was analyzed, and the solid-liquid reaction kinetics of fine carbon source particles in CuxTi melt was mathematically modeled.
Lei Guo; Yang Yang; Xiaochun Wen; Han Gao; Zhe Wang; Zhancheng Guo. Synthesis of Cu-based TiCx composites via in-situ reaction between CuxTi melt and dissolvable solid carbon. Powder Technology 2019, 362, 375 -385.
AMA StyleLei Guo, Yang Yang, Xiaochun Wen, Han Gao, Zhe Wang, Zhancheng Guo. Synthesis of Cu-based TiCx composites via in-situ reaction between CuxTi melt and dissolvable solid carbon. Powder Technology. 2019; 362 ():375-385.
Chicago/Turabian StyleLei Guo; Yang Yang; Xiaochun Wen; Han Gao; Zhe Wang; Zhancheng Guo. 2019. "Synthesis of Cu-based TiCx composites via in-situ reaction between CuxTi melt and dissolvable solid carbon." Powder Technology 362, no. : 375-385.
The feasibility of applying supergravity technology to enhance desilverization of crude Sn with Zn was studied using the model Sn–1.5Ag–xZn alloys. The solidification characteristics of the alloys were examined using differential scanning calorimetry and scanning electron microscopy. In addition, the effect of the supergravity field on the enrichment and separation behavior of Ag in the alloy samples was investigated. Upon cooling, Ag–Zn compounds crystallized first from the alloy melts, followed by the proeutectic Sn phase and Sn–Zn eutectic phase. A greater number of Ag–Zn compounds were formed with increasing Zn content. After supergravity enrichment, the Ag–Zn compounds were concentrated at the bottom of the samples. The Ag content gradually increased along the supergravity direction, and the distribution gradient of Ag in the sample became steeper with increasing gravity coefficient (G). The Ag–Zn compounds were effectively separated from the alloy melt by filtration under supergravity fields. After separating the Sn–1.5Ag–7.5Zn alloy at 230 °C and G = 400, Ag content of molten Sn which passed through the filter was decreased by 15.6 times to 0.102 wt%, while the majority of the Ag–Zn compounds were retained by the filter, resulting in a 93.6% separation rate of Ag.
Ning Zhang; Zhe Wang; Lei Guo; Long Meng; Zhancheng Guo. Supergravity process for enriching and separating Ag from Sn–Ag–Zn melts. Chemical Engineering and Processing - Process Intensification 2019, 143, 107591 .
AMA StyleNing Zhang, Zhe Wang, Lei Guo, Long Meng, Zhancheng Guo. Supergravity process for enriching and separating Ag from Sn–Ag–Zn melts. Chemical Engineering and Processing - Process Intensification. 2019; 143 ():107591.
Chicago/Turabian StyleNing Zhang; Zhe Wang; Lei Guo; Long Meng; Zhancheng Guo. 2019. "Supergravity process for enriching and separating Ag from Sn–Ag–Zn melts." Chemical Engineering and Processing - Process Intensification 143, no. : 107591.
The selective leaching of zinc from three different basic oxygen steelmaking (BOS) filter cakes by butyric acid was investigated to compare the leaching behaviors of zinc and further to establish the correlation of the zinc leaching performances and the chemical compositions. The effects of acid concentration and the acid to solid (L/S) stoichiometric ratio were studied, with different optimal leaching conditions obtained. BOS-1 showed the lowest leachability with only less than 10% of zinc removed by 0.5 M acid concentration and 90% of the L/S stoichiometric ratio in 10 h. The best zinc selectivity was achieved with BOS-2 at 51.2% of zinc leaching efficiency, with only 0.47% of iron loss under optimal conditions of 1.5 M acid concentration and a 70% stoichiometric ratio. BOS-3 showed the highest leaching of zinc but the optimal conditions depend on the priority consideration. Using 1.0 M acid and 90% stoichiometric ratio for 10 h, the leaching efficiency of zinc was 84.6% with 20% iron loss. The filter cakes and the leaching residues were characterized. The results indicate different zinc and iron leaching behaviors, which were probably related to the storage conditions, zinc containing phases and the leaching parameters.
Jingxiu Wang; Zhe Wang; ZhongZhi Zhang; Guangqing Zhang. Comparison of Butyric Acid Leaching Behaviors of Zinc from Three Basic Oxygen Steelmaking Filter Cakes. Metals 2019, 9, 417 .
AMA StyleJingxiu Wang, Zhe Wang, ZhongZhi Zhang, Guangqing Zhang. Comparison of Butyric Acid Leaching Behaviors of Zinc from Three Basic Oxygen Steelmaking Filter Cakes. Metals. 2019; 9 (4):417.
Chicago/Turabian StyleJingxiu Wang; Zhe Wang; ZhongZhi Zhang; Guangqing Zhang. 2019. "Comparison of Butyric Acid Leaching Behaviors of Zinc from Three Basic Oxygen Steelmaking Filter Cakes." Metals 9, no. 4: 417.
The selective leaching of zinc over iron from basic oxygen steelmaking (BOS) filter cake was investigated using mixtures of butyric acid with acetic and/or propionic acid, HCl, or H2SO4. The main focus was to assess the effects of other acids on the zinc and iron leaching in butyric acid. The results show that slight reduction of zinc leaching and increase in iron leaching may take place with addition of acetic and propionic acids, causing a minor decrease in the selectivity of zinc leaching over iron. Intermittent addition of H2SO4 and HCl was required to control the pH to be not less than that of pure butyric acid solution. Overall, an excellent selectivity can be maintained with the butyric acid–other acid mixtures. The results demonstrate the feasibility to use raw butyric acid without purification or waste butyric acid containing other impurity acids for leaching of zinc from the BOS filter cake to be recycled. Using high content of H2SO4 in leaching is not recommended because it has a more detrimental effect on the selectivity of zinc leaching and may cause deposition of CaSO4 in the leaching residue which may increase the SO2 or CO2 emission in later high-temperature recycling processes.
Jingxiu Wang; Zhe Wang; ZhongZhi Zhang; Guangqing Zhang. Effect of Addition of Other Acids into Butyric Acid on Selective Leaching of Zinc from Basic Oxygen Steelmaking Filter Cake. Metallurgical and Materials Transactions A 2019, 50, 1378 -1386.
AMA StyleJingxiu Wang, Zhe Wang, ZhongZhi Zhang, Guangqing Zhang. Effect of Addition of Other Acids into Butyric Acid on Selective Leaching of Zinc from Basic Oxygen Steelmaking Filter Cake. Metallurgical and Materials Transactions A. 2019; 50 (3):1378-1386.
Chicago/Turabian StyleJingxiu Wang; Zhe Wang; ZhongZhi Zhang; Guangqing Zhang. 2019. "Effect of Addition of Other Acids into Butyric Acid on Selective Leaching of Zinc from Basic Oxygen Steelmaking Filter Cake." Metallurgical and Materials Transactions A 50, no. 3: 1378-1386.
Hot-dip galvanizing dross is a valuable by-product and contains high levels of zinc and some iron impurities. In this work, the super-gravity technology was applied to removing iron impurities from an industrial galvanizing dross. Firstly, the enriching behaviour of iron phase was investigated in different super-gravity fields. The floatation movement of iron phase was greatly intensified by super gravity, leading to an iron-rich layer in the top area of the sample. Then, the separation of iron impurity from galvanizing dross was further carried out via filtration enhanced by super gravity. The majority of the iron impurities were retained in the upper residue by a filter felt, with the filtered zinc purified significantly. The efficiency of separating increased with increasing gravity coefficient (G). At G = 600, about 99.2 wt% iron was removed and the filtered zinc with a purity of about 99.9 wt% can be directly used as galvanizing zinc.
Anjun Shi; Zhe Wang; Lei Guo; Ning Zhang; Zhancheng Guo. Enriching and Separating Iron Impurity from Galvanizing Dross by Super-Gravity Technology. Proceedings of the International Conference on Martensitic Transformations: Chicago 2019, 467 -478.
AMA StyleAnjun Shi, Zhe Wang, Lei Guo, Ning Zhang, Zhancheng Guo. Enriching and Separating Iron Impurity from Galvanizing Dross by Super-Gravity Technology. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2019; ():467-478.
Chicago/Turabian StyleAnjun Shi; Zhe Wang; Lei Guo; Ning Zhang; Zhancheng Guo. 2019. "Enriching and Separating Iron Impurity from Galvanizing Dross by Super-Gravity Technology." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 467-478.
It was found that the real-time fluidization state can be monitored with the help of electric current acquisition during a fluidized bed reduction of iron ore fines, which might be used to the prediction of de-fluidization and localized fluidization state monitoring in a plant-scale fluidized bed. All Fe, FeO, and Fe3O4 phases have been proven to be conductive at high temperatures. In addition, the electric current detected in a fluidized bed under a normal fluidized state is virtually zero even for conductive bed materials. The solid bridges that emerged between these conductive particles were proved to be the cause of conductivity in a fluidized bed.
Lei Guo; Zhe Wang; Shengping Zhong; Qipeng Bao; Zhancheng Guo. Fluidization state monitoring using electric current during fluidized bed reduction of iron ore. Powder Technology 2018, 343, 683 -692.
AMA StyleLei Guo, Zhe Wang, Shengping Zhong, Qipeng Bao, Zhancheng Guo. Fluidization state monitoring using electric current during fluidized bed reduction of iron ore. Powder Technology. 2018; 343 ():683-692.
Chicago/Turabian StyleLei Guo; Zhe Wang; Shengping Zhong; Qipeng Bao; Zhancheng Guo. 2018. "Fluidization state monitoring using electric current during fluidized bed reduction of iron ore." Powder Technology 343, no. : 683-692.
Replicated open-cell aluminum foams were produced by infiltration casting in super-gravity fields.
Zhe Wang; Jintao Gao; Kuan Chang; Long Meng; Ning Zhang; Zhancheng Guo. Manufacturing of open-cell aluminum foams via infiltration casting in super-gravity fields and mechanical properties. RSC Advances 2018, 8, 15933 -15939.
AMA StyleZhe Wang, Jintao Gao, Kuan Chang, Long Meng, Ning Zhang, Zhancheng Guo. Manufacturing of open-cell aluminum foams via infiltration casting in super-gravity fields and mechanical properties. RSC Advances. 2018; 8 (29):15933-15939.
Chicago/Turabian StyleZhe Wang; Jintao Gao; Kuan Chang; Long Meng; Ning Zhang; Zhancheng Guo. 2018. "Manufacturing of open-cell aluminum foams via infiltration casting in super-gravity fields and mechanical properties." RSC Advances 8, no. 29: 15933-15939.
Exergy analyses on four solid oxide fuel cell (SOFC) systems using methane as the original fuel are conducted.
Zhe Wang; Weiyu Fan; Guangqing Zhang. Comparison of the exergy efficiency of four power generation systems from methane using fuel cells. RSC Advances 2017, 7, 39391 -39402.
AMA StyleZhe Wang, Weiyu Fan, Guangqing Zhang. Comparison of the exergy efficiency of four power generation systems from methane using fuel cells. RSC Advances. 2017; 7 (62):39391-39402.
Chicago/Turabian StyleZhe Wang; Weiyu Fan; Guangqing Zhang. 2017. "Comparison of the exergy efficiency of four power generation systems from methane using fuel cells." RSC Advances 7, no. 62: 39391-39402.