1. Microstructure, mechanical properties and tribological properties of NiCrAlY-Ag-SrF2 self-lubricating coatings by detonation spraying.
- Author
-
Liu, Jiangxia, Chen, Wenyuan, Chen, Juanjuan, Tan, Hui, Cheng, Jun, Zhu, Shengyu, and Yang, Jun
- Subjects
- *
MECHANICAL wear , *MECHANICAL failures , *HIGH temperatures , *BOND strengths , *TEMPERATURE effect , *LUBRICATION & lubricants - Abstract
Self-lubricating coating is used to solve the problem of insufficient lubrication and failure of mechanical transmission parts at high temperature. In this work, we designed a NiCrAlY-Ag-SrF 2 coating through the synergistic lubricating effect of a novel SrF 2 lubricant and Ag, and the reinforcing action of in-situ formed oxides. The results showed that the NiCrAlY-Ag-10 wt% SrF 2 coatings have high bond strength (60 MPa) and hardness due to the low porosity and production of in-situ oxides. From room temperature (RT) to 900 °C, the friction coefficient and wear rate of the coating are 0.29 − 0.47 and 1.03 × 10−5 − 6.74 × 10−5 mm3/N·m, respectively. This reveals that SrF 2 can be employed as an alternative to high temperature lubricants, and the coatings achieve lubrication effect at a wide temperature range. • NiCrAlY-Ag-SrF 2 coatings were produced by detonation spraying method. • SrF 2 and in-situ oxides are employed to lubricate and strengthen the coatings. • NiCrAlY-Ag-SrF 2 coatings achieve lubrication from room temperature to 900 °C. • The synergistic effect of SrF 2 , Ag, and in-situ formed SrCrO 4 is responsible for the lubrication performance over a wide temperature range. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF