Effect of Ag and Ti3SiC2 on Tribological Properties of TiAl Matrix Self-lubricating Composites at Room and Increased Temperatures |
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Authors: | Zengshi Xu Xiaoliang Shi Mang Wang Wenzheng Zhai Jie Yao Siyuan Song Qiaoxin Zhang |
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Affiliation: | 1. School of Mechanical and Electronic Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China
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Abstract: | Dry sliding tribological properties of TiAl matrix self-lubricating composites (TMSC) containing Ag, Ti3SiC2, Ag and Ti3SiC2 were investigated from 25 to 800 °C under ball-on-disk test conditions against Si3N4 counterface under the same conditions of 10 N-0.234 m/s. The results indicated that the tribological properties were strongly dependent on the lubricant additives. TMSC with the addition of Ag and Ti3SiC2 (TAT) exhibited the lower friction coefficients (0.32–0.43) and less wear rates (1.23–4.13 × 10?4 mm3 N?1m?1) in the wide temperature range of 25–800 °C. The excellent tribological properties of TAT over the wide temperature range were attributed to the synergetic effect of Ag and Ti3SiC2 lubricants, silver diffusion forming a rich-silver smooth tribo-film on the frictional surface of TAT at low and moderate temperatures from 25 to 400 °C, while Ti3SiC2 oxidation reaction forming rich-oxide tribo-film on the worn surface of TAT at higher temperatures of 600 and 800 °C. |
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