Abstract: The high temperature reaction between particle SiC and base Ni of Ni-SiC composite plating, and the effect of the reaction on wearing resistance are studied. SiC decomposes only partly on annealing the plating at 600℃. At first, a transist phase Ni5Si2 is formed and then it is replaced by a stable phase Ni3Si gradually. As a result, a composite, SiC-Ni3Si-graphite-Ni, is produced. At high temperature, SiC decomposes completely. With temperature, the graphite layer thickenes and Si/Ni ratio of the Ni-Si compound increases. The wearing resistant of the plating depends on the high temperature reaction.

Key words: Composite plating, High temperature reaction, Wearing resistance