Tribo-oxide Competition and Oxide Layer Formation of Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub> Self-Lubricating Composites during the Friction Process in a Wide Temperature Range
oleh: Rui Zhang, Wei Feng, Fuyan Liu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2021-12-01 |
Deskripsi
Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub> composites were prepared by the spark plasma sintering (SPS) process. Both the microstructure of Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub> and the influence of test temperature on the tribological behavior of the Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub>composites were investigated. The synergistic effect of friction and oxidation was evaluated by analyzing the worn surface morphology. The results showed that Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub> were still brittle materials after adding CaF<sub>2</sub>, which was in agreement with Ti<sub>3</sub>SiC<sub>2</sub>. The hardness, relative density, flexural strength and compressive strength of the Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub> composites were slightly lower than those of Ti<sub>3</sub>SiC<sub>2</sub>, and the addition of CaF<sub>2</sub> decreased the decomposition temperature of Ti<sub>3</sub>SiC<sub>2</sub> from 1350 to 1300 °C. Simultaneously, as the temperature of the test increased, the friction coefficient of Ti<sub>3</sub>SiC<sub>2</sub>/CaF<sub>2</sub> showed a downward trend (from 0.81 to 0.34), and its the wear rate was insensitive.