Stop-off for diffusion coating

C - Chemistry – Metallurgy – 23 – C

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C23C 10/04 (2006.01)

Patent

CA 2365709

A mask suitable for protecting a portion of a substrate surface against diffusion coating of the substrate with a metal, which mask comprises a ceramic material comprising silica and an inert refractory diluent and a metal or metal alloy, wherein the metal or metal alloy is one which is reactive with silicon thereby minimising or preventing siliconisation of the substrate with silicon in the ceramic material under conditions of diffusion coating, and which is reactive with the metal being applied by diffusion coating thereby preventing diffusion coating of the portion of the substrate surface it is desired to protect.

L'invention concerne un masque protégeant une partie de la surface du substrat contre l'application d'un revêtement métallique par diffusion sur le substrat. Ce masque comprend un matériau céramique comportant de la silice, un diluant réfractaire inerte et un métal ou un l'alliage de métaux. Ce métal ou cet alliage de métaux réagissant avec le silicium, ils minimisent ou empêchent la pénétration dans le substrat du silicium contenu dans le matériau céramique dans les conditions de l'application du revêtement par diffusion. Ce métal ou cet alliage de métaux réagissant avec le métal appliqué par diffusion, ils empêchent l'application du revêtement par diffusion sur la partie de la surface du substrat que l'on désire protéger.

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