Diffusion barrier layers

Details Diffusion barrier layers Diffusion barrier layers

C - Chemistry, Metallurgy

23

C

C23C 14/04 (2006.01) C23C 14/16 (2006.01) C23C 14/58 (2006.01) C23C 26/00 (2006.01)

Patent

CA 2156081

A method of applying a continuous stable intermetallic diffusion barrier layer to a high temperature metallic article is described. In many instances, protective coatings are incompatible with the material of the substrate to which they are applied. Such incompatilibility is overcome in the invention through in situ formation of an intermediate stable diffusion barrier layer by sequential deposition and subsequent reaction of suitable metals to form a continuous intermetallic layer. A conventional overlay coating may then be applied to the intermetallic layer without risk to the underlying substrate. The invention also contemplates creation of unitary diffusion barriers from multi-layer deposits; deposition of plural diffusion barriers, and formation of complete protective systems comprising substrate, diffusion barrier(s) and overlay coating prior to heat treatment in situ.

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