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Dapeng Gu
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China

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Paper
Published: 27 July 2020 in Journal of Materials Chemistry C
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Two-dimensional (2D) layered bismuth (Bi) with a thickness-dependent direct bandgap (0–0.55 eV) has attracted ever-increasing research interest in electronics, energy storage and conversion devices.

ACS Style

Bingchao Yang; Xiangjun Li; Yong Cheng; Shuai Duan; Bo Zhao; Wencai Yi; Chao Wang; Hairui Sun; Zhixiu Wang; Dapeng Gu; Suwen Chen; Xiaobing Liu. Liquid phase exfoliation of bismuth nanosheets for flexible all-solid-state supercapacitors with high energy density. Journal of Materials Chemistry C 2020, 1 .

AMA Style

Bingchao Yang, Xiangjun Li, Yong Cheng, Shuai Duan, Bo Zhao, Wencai Yi, Chao Wang, Hairui Sun, Zhixiu Wang, Dapeng Gu, Suwen Chen, Xiaobing Liu. Liquid phase exfoliation of bismuth nanosheets for flexible all-solid-state supercapacitors with high energy density. Journal of Materials Chemistry C. 2020; ():1.

Chicago/Turabian Style

Bingchao Yang; Xiangjun Li; Yong Cheng; Shuai Duan; Bo Zhao; Wencai Yi; Chao Wang; Hairui Sun; Zhixiu Wang; Dapeng Gu; Suwen Chen; Xiaobing Liu. 2020. "Liquid phase exfoliation of bismuth nanosheets for flexible all-solid-state supercapacitors with high energy density." Journal of Materials Chemistry C , no. : 1.

Articles
Published: 05 May 2020 in Tribology Transactions
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The tribological performances of ceramic-polymer composites prepared by high pressure (3GPa) compression molding of Silicon nitride (Si3N4) and Polytetrafluoroethylene (PTFE) with epoxy resin (EP) binder were investigated under the dry friction conditions. Fourier Transform Infrared (FTIR) Spectroscopy, Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive Spectroscopy (EDS) were utilized to characterize Si3N4-PTFE-EP composites. The Vickers hardness and Shore hardness were tested respectively and the thermal stability was evaluated by Thermogravimetric Analysis (TGA). The results indicate that the lowest wear rate reaches 10−7 mm3(Nm)−1 and the lowest friction coefficient is about 0.06. With the increase of the PTFE mass fraction, the main wear form gradually changes from abrasive wear to adhesive wear, but fatigue wear always exists.

ACS Style

Dapeng Gu; Shouyao Liu; Suwen Chen; Kefeng Song; Bingchao Yang; Deng Pan. Tribological Performance of Si3N4-PTFE Composites Prepared by High-Pressure Compression Molding. Tribology Transactions 2020, 63, 756 -769.

AMA Style

Dapeng Gu, Shouyao Liu, Suwen Chen, Kefeng Song, Bingchao Yang, Deng Pan. Tribological Performance of Si3N4-PTFE Composites Prepared by High-Pressure Compression Molding. Tribology Transactions. 2020; 63 (4):756-769.

Chicago/Turabian Style

Dapeng Gu; Shouyao Liu; Suwen Chen; Kefeng Song; Bingchao Yang; Deng Pan. 2020. "Tribological Performance of Si3N4-PTFE Composites Prepared by High-Pressure Compression Molding." Tribology Transactions 63, no. 4: 756-769.

Short communication
Published: 24 February 2020 in Materials Letters
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A novel method combined with fabric embossing (embossing with fabric template) and thermal annealing is proposed to prepare multistage textured superhydrophobic polytetrafluoroethylene (PTFE) surface. Multistage (four-stage) textures of microscale Y-grooves (≈175 µm), F-grooves (≈10 µm), warts (≈3 µm), and nanoscale dendrites (≈380 nm) were obtained. The multistage textures endowed the PTFE surface with better superhydrophobicity, comparing with the two-stage textures with Y-grooves and F-grooves or the two-stage textures with warts and dendrites. Optimum superhydrophobicity is obtained at thermal annealing temperatures 345 °C and 360 °C.

ACS Style

Dapeng Gu; Kefeng Song; Suwen Chen; Shouyao Liu; Bingchao Yang; Xiaoying Ma; Zibo Wang; Shuaibing Wang. Multistage textured superhydrophobic polytetrafluoroethylene surface prepared by fabric embossing and thermal annealing. Materials Letters 2020, 268, 127556 .

AMA Style

Dapeng Gu, Kefeng Song, Suwen Chen, Shouyao Liu, Bingchao Yang, Xiaoying Ma, Zibo Wang, Shuaibing Wang. Multistage textured superhydrophobic polytetrafluoroethylene surface prepared by fabric embossing and thermal annealing. Materials Letters. 2020; 268 ():127556.

Chicago/Turabian Style

Dapeng Gu; Kefeng Song; Suwen Chen; Shouyao Liu; Bingchao Yang; Xiaoying Ma; Zibo Wang; Shuaibing Wang. 2020. "Multistage textured superhydrophobic polytetrafluoroethylene surface prepared by fabric embossing and thermal annealing." Materials Letters 268, no. : 127556.

Journal article
Published: 18 July 2019 in RSC Advances
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Wear resistance of PMMA/PTFE composite improved by heat treatment (pressures temperatures, times).

ACS Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Deng Pan; Bingchao Yang; Shouyao Liu. Heat treatment to improve the wear resistance of PTFE/PMMA composites. RSC Advances 2019, 9, 22289 -22294.

AMA Style

Dapeng Gu, Longxiao Zhang, Suwen Chen, Kefeng Song, Deng Pan, Bingchao Yang, Shouyao Liu. Heat treatment to improve the wear resistance of PTFE/PMMA composites. RSC Advances. 2019; 9 (39):22289-22294.

Chicago/Turabian Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Deng Pan; Bingchao Yang; Shouyao Liu. 2019. "Heat treatment to improve the wear resistance of PTFE/PMMA composites." RSC Advances 9, no. 39: 22289-22294.

Research article
Published: 16 January 2019 in Advances in Mechanical Engineering
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An analytical model for large-cylinder asymmetrical rolling is proposed based on an improved slab method, which can predict the rolling force more quickly. In this method, uneven normal and shear stresses acting on the vertical side are supposed. In the solution, the upper and lower contact lengths are different, and the roll gap is divided into four slabs. Moreover, the effects of the rolling parameters such as roll speed ratio, roll radius, exit thickness, and radius of cylinder on the rolling force and cross-shear zone ratio are investigated. The cross-shear zone ratio, which means the shear effect, is a key parameter in reducing rolling force and microstructure refinement. This method is conducted with the experimental and finite element verification, and good agreement has been found. It should be noted that the calculation result can be obtained rapidly and easily by this proposed model. Therefore, the present model is suitable for online application.

ACS Style

Suwen Chen; Jie Li; Xingxing Yuan; Dapeng Gu; Hongmin Liu. A fast calculation method of large-cylinder asymmetrical rolling force considering shear effect. Advances in Mechanical Engineering 2019, 11, 1 .

AMA Style

Suwen Chen, Jie Li, Xingxing Yuan, Dapeng Gu, Hongmin Liu. A fast calculation method of large-cylinder asymmetrical rolling force considering shear effect. Advances in Mechanical Engineering. 2019; 11 (1):1.

Chicago/Turabian Style

Suwen Chen; Jie Li; Xingxing Yuan; Dapeng Gu; Hongmin Liu. 2019. "A fast calculation method of large-cylinder asymmetrical rolling force considering shear effect." Advances in Mechanical Engineering 11, no. 1: 1.

Article
Published: 21 September 2018 in Journal of Applied Polymer Science
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The filling combination of polytetrafluoroethylene (PTFE)/Cu/Al2O3 filled poly(methyl methacrylate) (PMMA) based composites aiming at low friction and wear is optimized based on L9(34) by Taguchi method. The worn morphologies of PMMA based composites are analyzed by scanning electron microscopy (SEM). The PTFE transfer film and the wear debris on the steel ball surface are analyzed by SEM and X‐ray spectroscopy. It is observed that the friction and wear of PMMA can be obviously decreased by filling with PTFE, Cu, and Al2O3. PTFE has the most significant but Cu has the negligibly smallest contribution on both the friction coefficient and the wear rate. The lower friction coefficient (<0.2) appears by the combination of the mass ratio of PTFE larger than about 4.5% and the mass ratio of Al2O3 lower than ∼7.5%. The lower wear rate (<5 × 10−5 mm3/Nm) appears by the combination of the mass ratio of PTFE larger than about 5% and the mass ratio of Al2O3 lower than ∼8%, but it does not include that PTFE is greater than about 8.5% and Al2O3 is less than about 1.5%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46705.

ACS Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Shouyao Liu. Optimization of PTFE/Cu/Al2 O3 filled PMMA based composites on tribological properties using Taguchi design method. Journal of Applied Polymer Science 2018, 135, 1 .

AMA Style

Dapeng Gu, Longxiao Zhang, Suwen Chen, Kefeng Song, Shouyao Liu. Optimization of PTFE/Cu/Al2 O3 filled PMMA based composites on tribological properties using Taguchi design method. Journal of Applied Polymer Science. 2018; 135 (45):1.

Chicago/Turabian Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Shouyao Liu. 2018. "Optimization of PTFE/Cu/Al2 O3 filled PMMA based composites on tribological properties using Taguchi design method." Journal of Applied Polymer Science 135, no. 45: 1.

Journal article
Published: 01 September 2018 in Polymers
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Polytetrafluoroethylene/Poly(methyl methacrylate) (PTFE/PMMA) composite was prepared by mixing PTFE into PMMA matrix which synthesized by the PMMA powder mixture and methyl methacrylate (MMA) liquid mixture. The effects of the filling mass ratio of PTFE and powder/liquid (P/L) ratio on the friction and wear properties of PTFE/PMMA composites against bearing steel were studied by a ball-on-disk tribometer. Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS) were used to characterize the synthesis of PTFE/PMMA composite. The shore hardness and glass transition temperature (Tg) were obtained respectively by shore hardness tester and differential scanning calorimetry (DSC). The results show that the friction coefficient and wear rate of PMMA based composite, comparing with the unfilled PMMA, can be significantly reduced by filling with PTFE. With the increasing of PTFE filling mass ratio, the wear rate of PTFE/PMMA composite increases. The friction coefficient and wear rate of the unfilled PMMA and PTFE/PMMA composite generally decrease with the P/L ratio increasing. The main wear mechanism of the unfilled PMMA is adhesive wear. While the main wear mechanisms of PTFE/PMMA composites are fatigue wear and abrasive wear.

ACS Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Shouyao Liu. Significant Reduction of the Friction and Wear of PMMA Based Composite by Filling with PTFE. Polymers 2018, 10, 966 .

AMA Style

Dapeng Gu, Longxiao Zhang, Suwen Chen, Kefeng Song, Shouyao Liu. Significant Reduction of the Friction and Wear of PMMA Based Composite by Filling with PTFE. Polymers. 2018; 10 (9):966.

Chicago/Turabian Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Shouyao Liu. 2018. "Significant Reduction of the Friction and Wear of PMMA Based Composite by Filling with PTFE." Polymers 10, no. 9: 966.

Journals
Published: 07 June 2018 in RSC Advances
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Orientations and weaves played an important role in the friction reduction and antiwear properties of PTFE/Kevlar fabric composite.

ACS Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Shouyao Liu. Reciprocating sliding wear of hybrid PTFE/Kevlar fabric composites along different orientations. RSC Advances 2018, 8, 20877 -20883.

AMA Style

Dapeng Gu, Longxiao Zhang, Suwen Chen, Kefeng Song, Shouyao Liu. Reciprocating sliding wear of hybrid PTFE/Kevlar fabric composites along different orientations. RSC Advances. 2018; 8 (37):20877-20883.

Chicago/Turabian Style

Dapeng Gu; Longxiao Zhang; Suwen Chen; Kefeng Song; Shouyao Liu. 2018. "Reciprocating sliding wear of hybrid PTFE/Kevlar fabric composites along different orientations." RSC Advances 8, no. 37: 20877-20883.

Journal article
Published: 20 December 2017 in Autex Research Journal
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Polytetrafluoroethylene (PTFE)/Kevlar fabric or fabric composites with excellent tribological properties have been considered as important materials used in bearings and bushing, for years. The components’ (PTFE, Kevlar, and the gap between PTFE and Kevlar) distribution of the PTFE/Kevlar fabric is uneven due to the textile structure controlling the wear process and behavior. The components’ area ratio on the worn surface varying with the wear depth was analyzed not only by the wear experiment, but also by the theoretical calculations with our previous wear geometry model. The wear process and behavior of the PTFE/Kevlar twill fabric were investigated under dry sliding conditions against AISI 1045 steel by using a ring-on-plate tribometer. The morphologies of the worn surface were observed by the confocal laser scanning microscopy (CLSM). The wear process of the PTFE/Kevlar twill fabric was divided into five layers according to the distribution characteristics of Kevlar. It showed that the friction coefficients and wear rates changed with the wear depth, the order of the antiwear performance of the previous three layers was Layer III>Layer II>Layer I due to the area ratio variation of PTFE and Kevlar with the wear depth.

ACS Style

Dapeng Gu; BingLi Fan; Fei Li; Yulin Yang; Suwen Chen. Wear Process Analysis of the Polytetrafluoroethylene/Kevlar Twill Fabric Based on the Components’ Distribution Characteristics. Autex Research Journal 2017, 17, 295 -302.

AMA Style

Dapeng Gu, BingLi Fan, Fei Li, Yulin Yang, Suwen Chen. Wear Process Analysis of the Polytetrafluoroethylene/Kevlar Twill Fabric Based on the Components’ Distribution Characteristics. Autex Research Journal. 2017; 17 (4):295-302.

Chicago/Turabian Style

Dapeng Gu; BingLi Fan; Fei Li; Yulin Yang; Suwen Chen. 2017. "Wear Process Analysis of the Polytetrafluoroethylene/Kevlar Twill Fabric Based on the Components’ Distribution Characteristics." Autex Research Journal 17, no. 4: 295-302.

Journal article
Published: 01 November 2016 in Tribology International
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The dry sliding tribological properties of hybrid PTFE/Kevlar fabric composite were investigated under ambient and different vacuums, loads, sliding velocities, and temperatures. The results showed that hybrid PTFE/Kevlar fabric composite displayed lower friction coefficient in vacuum than that in ambient and satisfactory antiwear performance in low vacuum and middle vacuum, but poor antiwear performance in high vacuum. In vacuum, the friction coefficient and wear rates decrease with the increasing of sliding velocities, loads and temperature within a certain range. But the higher temperature of 60 °C detriments the friction coefficient and wear rate. Textile structure also has an obvious influence on the antiwear performance. The main wear mechanism in vacuum including plastic deformation, micro-cutting, fatigue damage and abrasive wear.

ACS Style

Dapeng Gu; Changsheng Duan; BingLi Fan; Suwen Chen; Yulin Yang. Tribological properties of hybrid PTFE/Kevlar fabric composite in vacuum. Tribology International 2016, 103, 423 -431.

AMA Style

Dapeng Gu, Changsheng Duan, BingLi Fan, Suwen Chen, Yulin Yang. Tribological properties of hybrid PTFE/Kevlar fabric composite in vacuum. Tribology International. 2016; 103 ():423-431.

Chicago/Turabian Style

Dapeng Gu; Changsheng Duan; BingLi Fan; Suwen Chen; Yulin Yang. 2016. "Tribological properties of hybrid PTFE/Kevlar fabric composite in vacuum." Tribology International 103, no. : 423-431.