Abstract
This paper describes post-heat treatment reaction diffusion between thermal sprayed aluminium and several kinds of substrate. The alloy layer formedby the spray diffusion process depends strongly on the composition of the substrate. It was found that appropriate surface properties can be obtained by selecting substrates of suitable composition and/or byselecting appropriate interlayers between the substrate and aluminium top coating. First, formation of alloy phases between an aluminium spray coating and a pure iron or plain carbon steel substrate by spray diffusion was examined in order to obtain fundamental information. Second, an 18Cr–8Ni austenitic stainless steelsubstrate was selected for testing. Finally, interdiffusion of multiple layered coatings with Ni–Cr–Mo alloys and aluminium on to stainless steel substrates was investigated.
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