| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1658422 | Surface and Coatings Technology | 2012 | 6 Pages |
A Ni3Al–Ag–Mo–BaF2/CaF2 self-lubricating composite coating was fabricated by a powder metallurgical process. The tribological properties of the coating against Si3N4 were investigated over a wide temperature range (25–1000 °C). The results showed that the coating had a low friction coefficient (0.24–0.38) in the entire temperature range. Lubricating mechanism analysis results indicated that Ag took effect at low temperature (below 400 °C); BaF2/CaF2 began to work as a solid lubricant as the temperature raised; and the molybdates, which formed by the fluorides oxidation, act as lubricants at higher temperatures (above 800 °C). As a result, the coating expressed a low friction coefficient from 25 °C to 1000 °C.
► A Ni3Al-based composite coating was fabricated by a powder metallurgical process. ► The coating is well adherent to the substrate and possesses high bonding strength. ► The coating shows low friction coefficient over a wide temperature range.
