Citation

Zmii VI, Kovtun NV. Powder Metallurgy and Metal Ceramics 2002; 41(7-8): 395-399.

Copyright

(Copyright © 2002)

DOI

10.1023/A:1021121227445

PMID

unavailable

Abstract

The effect of a subsurface layer of metal suicide on the phase composition stability of high-temperature MeSi2-type coatings on refractory metals was investigated. Using the system WSi2-W as a prototype it was experimentally determined that a subsurface layer of the tungsten disilicide, and the distribution profile of silicon in the diffusion zone upon high-temperature heating have a substantial effect on the formation of a barrier layer of lower suicide which determines the stability of the system as a whole. It is proposed that the search for more stable suicide coatings on refractory metals should be directed toward the creation of diffusion barriers on not only the inner interface MeSi2-Me, but also the external surface of the coating. The process of coating formation must be accompanied by the formation of a metal suicide on the external surface with the highest possible concentration of silicon.

Language: en

Keywords

Coatings; Concentration (process); Diffusion; Protective coatings; Refractory metal; Refractory metals; Silcides; Silicon; Silicon compounds; Subsurface layers; Surfaces