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Hongfei Shang
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

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Journal article
Published: 30 October 2020 in Coatings
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A simulation of magnetic-field-induced ion motion in vacuum arc deposition for the inner surfaces of a tubular workpiece was performed. An auxiliary magnetic field was set to guide the motion of ions inside a pipe, with different magnetic flux densities and ion emission parameters. The results showed the trajectories, deposition ratio and depth of the ions can be controlled via a magnetic field. Within a certain range, the deposition ratio of the ions increases with magnetic flux density. When the magnetic flux density reached a certain value, both the trajectories and deposition ratio of the ions exhibited an obvious periodicity. The depth at which the ions were deposited decreased as an exponential function of the magnetic flux density and ion emission radius, respectively. With an increase in the emission angle, the deposition depth decreased linearly. A numerical model was proposed to express the distribution of the deposition depth. In addition, the deposition ratio and depth are improved with a magnetic field in an environment with a certain density of neutral gas.

ACS Style

Tiancheng Wang; Yulei Yang; Tianmin Shao; Bingxue Cheng; Qian Zhao; Hongfei Shang. Simulation of Magnetic-Field-Induced Ion Motion in Vacuum Arc Deposition for Inner Surfaces of Tubular Workpiece. Coatings 2020, 10, 1053 .

AMA Style

Tiancheng Wang, Yulei Yang, Tianmin Shao, Bingxue Cheng, Qian Zhao, Hongfei Shang. Simulation of Magnetic-Field-Induced Ion Motion in Vacuum Arc Deposition for Inner Surfaces of Tubular Workpiece. Coatings. 2020; 10 (11):1053.

Chicago/Turabian Style

Tiancheng Wang; Yulei Yang; Tianmin Shao; Bingxue Cheng; Qian Zhao; Hongfei Shang. 2020. "Simulation of Magnetic-Field-Induced Ion Motion in Vacuum Arc Deposition for Inner Surfaces of Tubular Workpiece." Coatings 10, no. 11: 1053.

Journal article
Published: 21 December 2019 in Applied Surface Science
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Nitrogen implantation was utilized to improve the adhesion strength of TiAlN film on γ-TiAl alloy. The process involves nanometer-scale TiAlN film deposition by ion beam assisted deposition (IBAD), followed by successive nitrogen implantation and final TiAlN film deposition by IBAD. All processes were conducted in the same chamber without breaking vacuum. Adhesion strength of TiAlN films was evaluated using scratch test. Elemental depth profiles and bonding status in the mixed transition zone created by implantation were analyzed using X-ray photoelectron spectroscopy (XPS). Mechanical properties of the mixed transition zone were studied using nanoindentation. Nitrogen implantation significantly improves the adhesion strength of the TiAlN films. Mechanisms behind the improvement were explained in terms of the mixed transition zone formed and enhanced mechanical properties.

ACS Style

Yulei Yang; Hongfei Shang; Tianmin Shao. Influence of nitrogen implantation on adhesion strength of TiAlN film on γ-TiAl alloy. Applied Surface Science 2019, 508, 145141 .

AMA Style

Yulei Yang, Hongfei Shang, Tianmin Shao. Influence of nitrogen implantation on adhesion strength of TiAlN film on γ-TiAl alloy. Applied Surface Science. 2019; 508 ():145141.

Chicago/Turabian Style

Yulei Yang; Hongfei Shang; Tianmin Shao. 2019. "Influence of nitrogen implantation on adhesion strength of TiAlN film on γ-TiAl alloy." Applied Surface Science 508, no. : 145141.

Journal article
Published: 05 August 2019 in Biomimetics
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Plunger pumps are widely used in oil pumping units around the world. The water content of the wellbore is increasing along with the development progress, so the lubricating capacity of the well fluids between the plunger and barrel is decreasing correspondingly. Commonly, the substrate material of the plunger and barrel are stainless steel, and the plunger surface is usually covered with nickel-based coating. Therefore, the performance of the plunger and barrel has been affected due to poor lubrication and eccentric wear. Non-smooth surfaces have been proven to improve the tribology performance in many cases. A surface texturing plunger covered with specific dimples has been prepared by using laser surface texturing technology. The morphology of the surface texturing plunger was characterized and analyzed. The tribology performance of surface texturing plunger samples was tested using standard friction and wear test machines with oil and water lubrication, respectively. The results indicated that surface texturing could effectively reduce the coefficient of friction, and the wear resistance of the surface textured samples has been improved to some extent.

ACS Style

Songbo Wei; Hongfei Shang; Chenglong Liao; Junyuan Huang; Bairu Shi. Tribology Performance of Surface Texturing Plunger. Biomimetics 2019, 4, 54 .

AMA Style

Songbo Wei, Hongfei Shang, Chenglong Liao, Junyuan Huang, Bairu Shi. Tribology Performance of Surface Texturing Plunger. Biomimetics. 2019; 4 (3):54.

Chicago/Turabian Style

Songbo Wei; Hongfei Shang; Chenglong Liao; Junyuan Huang; Bairu Shi. 2019. "Tribology Performance of Surface Texturing Plunger." Biomimetics 4, no. 3: 54.