Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898306 | Journal of the European Ceramic Society | 2018 | 8 Pages |
Abstract
High toughness integrated with self-lubricity of β-Sialon composites at elevated temperature containing second phase particles were successfully fabricated. It was found that the fracture toughness can be substantially improved by addition of Cu powder. The fracture toughness can be reached 6.75â¯MPaâ¯m1/2 and 4.42â¯MPaâ¯m1/2 at 25 and 900â¯Â°C, respectively. Meanwhile, the tribological properties of Cu-doped Sialons have a tremendous improvement at high temperature. Especially when the content of Cu powder is above 10â¯wt%, the wear rate decreases by two orders of magnitude and the friction coefficient reduces to 0.56-0.65 at 900â¯Â°C. In addition, the microstructure of composites was characterized, and crack propagation behavior and tribological behavior were discussed to clarify the toughening mechanisms and self-lubrication mechanisms. The results show that the principal toughening mechanisms are crack deflection and crack bridging. The tribo-chemical reaction and generated CuO films with lubricity are the main self-lubrication mechanisms.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Qichun Sun, Jun Yang, Bing Yin, Jun Cheng, Shengyu Zhu, Shuai Wang, Yuan Yu, Zhuhui Qiao, Weimin Liu,