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-SrF2 coating through the synergistic lubricating effect of a novel SrF2 lubricant and Ag, and the reinforcing action of in-situ formed oxides. The results showed that the NiCrAlY-Ag-10 wt% SrF2 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 SrF2 can be employed as an alternative to high temperature lubricants, and the coatings achieve lubrication effect at a wide temperature range.
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