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Tribological performance of a Ni3Al matrix self-lubricating composite coating tested from 25 to 1000°C
- Source :
-
Surface & Coatings Technology . May2012, Vol. 206 Issue 19/20, p3938-3943. 6p. - Publication Year :
- 2012
-
Abstract
- Abstract: 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. [Copyright &y& Elsevier]
- Subjects :
- *TRIBOLOGY
*NICKEL compounds
*POWDER metallurgy
*METAL coating
*MOLYBDATES
*FLUORIDES
Subjects
Details
- Language :
- English
- ISSN :
- 02578972
- Volume :
- 206
- Issue :
- 19/20
- Database :
- Academic Search Index
- Journal :
- Surface & Coatings Technology
- Publication Type :
- Academic Journal
- Accession number :
- 76157554
- Full Text :
- https://doi.org/10.1016/j.surfcoat.2012.03.064