1. Investigation of the Synergistic Effect of Cr and CeO2 on the Mechanical, Oxidation, and Tribological Properties of Ni-Based Self-lubricating Composites.
- Author
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Yu, Chengtao, Xie, Leipeng, Wang, Qunchang, Niu, Jianmin, Niu, Yunsong, Chen, Minghui, and Wang, Fuhui
- Subjects
MECHANICAL wear ,FLEXURAL strength ,WEIGHT gain ,COMPRESSIVE strength ,FRICTION - Abstract
To improve the tribological properties of sulfur-containing Ni-based self-lubricating composites, FGH97-WS
2 -Cr-CeO2 (FWCC) were prepared by spark plasma sintering technique. All composites prepared obtained new phases Crx Sy and M6 C, originating from the decomposition of WS2 . Homogenization and fine microstructure resulted in the best mechanical properties of the FWCC composites, with the microhardness of 542 ± 12 HV, compressive yield strength of 1910 ± 52 MPa, and flexural strength of 954 ± 34 MPa. When the composites exposed to 600 °C, the oxidation of Crx Sy dominated the oxidative weight gain. The coefficient of friction and wear rate of FWCC composites both tend to decrease with increasing temperature. The optimum tribological properties of FWCC composites are obtained at 600 °C with the coefficient of friction of 0.23 and the wear rate of 0.22 × 10-5 mm3 N-1 m-1 . The wear rate is two orders of magnitude lower than that of FGH97-WS2 composites (FW). This is mainly due to the synergistic effect of Cr and CeO2 . The addition of Cr promotes the formation of enough Cr2 O3 oxide particles during friction, while the addition of CeO2 not only enhances the adhesion of the oxide enamel layer, but also improves the high-temperature stability of the sulfide. [ABSTRACT FROM AUTHOR]- Published
- 2024
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