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2. Plasma surface alloyed Ta diffusion layer and Ta coating on Ti6Al4V alloy: Mechanical and wear properties.

Author

Zheng, Xin, Zheng, Ke, Jia, Wenru, Qu, Shuaiwu, Yu, Shengwang, Zhou, Bing, Chang, Jiannan, Ma, Yong, and Gao, Jie

Subjects
PLASMA surface alloying, MECHANICAL wear, STRAINS & stresses (Mechanics), SURFACE coatings, NANOINDENTATION tests, MECHANICAL alloying
Abstract

In this study, a pure Ta diffusion layer and Ta deposition coating were diffused and deposited on the Ti6Al4V substrate by the double glow plasma surface alloying technique. The surface morphology, cross-sectional element distribution, and phases were characterized by SEM, energy-dispersive x-ray spectrometer (EDS), and XRD. Both the mechanical properties and the wear resistance were investigated through the nanoindentation test and reciprocating friction-wear test. In addition, wear simulation was also examined. Ta deposition coating showed a denser and typical cauliflower structure. The Ta diffusion layer, however, exhibited two distinct types of structure: cellular grains and a kind of structure, aggregated and white, with a greater concentration of the Ta element. The cross-sectional morphology and the EDS result showed that a metallurgical bonding was developed between the coating and substrate. In addition, based on the result of nanoindentation, the Ta diffusion layer had higher hardness, elastic modulus, and initial yield strength than that of Ta deposition coating. However, the reciprocating friction-wear result revealed that the Ta deposition coating displayed better wear resistance compared with the Ta diffusion layer due to the thin thickness and inhomogeneous Ta element concentration. The wear simulation result revealed that the stable highest contact temperature is 103.7 °C by nonlinear curve fitting, and the Ta diffusion layer showed the highest equivalent stress. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Influence of Si on the Microstructure and Mechanical and Tribological Properties of Ag/a-C:H Films

Author

Wu, Yanxia, Zhang, Shujiao, Meng, Jie, Wang, Shengxi, Yu, Shengwang, Ma, Yong, Tang, Bin, Liu, Ying, and Komvopoulos, Kyriakos

Subjects
Hydrogenated amorphous carbon, composition, films, mechanical, tribological properties, silicon, silver, Mechanical Engineering, Mechanical Engineering & Transports
Abstract

The relatively high toughness, high adhesion to steel, and low internal stress of hydrogenated amorphous carbon (a-C:H) films containing Ag make them good candidate materials for various applications in sensors, tribology, and biomaterials; however, the relatively low hardness and poor tribological properties in oxidizing environments hinder their broad use. Incorporating a small amount of Si in Ag/a-C:H films may modify the film microstructure and, in turn, improve their mechanical and tribological properties. To test this hypothesis, Ag/Si/a-C:H films were synthesized by magnetron sputtering and their microstructure, composition, and mechanical/tribological properties were examined with various microanalysis techniques and mechanical testing methods. The Si content of the films was varied by controlling the rotational speed of the substrate. It is shown that the incorporation of Si in the films increases the sp 3 C, sp 3 CH, and sp 3 CH2 contents, slightly roughens the film surface, and greatly improves the mechanical and tribological properties through the formation of a SiC phase. The results of this study also show that there is a critical Si content for optimal tribological properties.

Published
2020

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