using gases (C23C8/36 takes precedence)

Full Title

Solid state diffusion of only non-metal elements into metallic material surfaces (diffusion of silicon C23C10/00); Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals (C23C14/00 takes precedence) > using gases (C23C8/36 takes precedence)

Child Classifications

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• C23C 8/08 only one element being applied
• C23C 8/28 more than one element being applied in one step
• C23C 8/34 more than one element being applied in more than one step
• C23C 8/36 using ionised gases, e.g. ionitriding