Method and apparatus for surface treatment

Details Method and apparatus for surface treatment Method and apparatus for surface treatment

C - Chemistry, Metallurgy

23

C

32/28, 117/88

C23C 16/00 (2006.01) C23C 16/32 (2006.01) C23C 16/34 (2006.01) C23C 16/36 (2006.01) C23C 16/442 (2006.01) C23C 16/448 (2006.01)

Patent

CA 1336150

Particles of a layer-forming agent containing at least one element for forming a surface layer of e.g. a carbide on the material to be treated are disposed in a furnace below and/or at the side of the material to be treated. A fluidizing gas is introduced into the furnace below the layer-forming agent for fluidizing a powder of alumina or other refractory material to form a fluidized bed above the layer-forming agent, while the agent is not fluidized. The furnace is heated and a solid halide is supplied into the furnace below the layer-forming agent. The halide is sublimable to produce a gas which activates the element, so that it may combine with a particular element which the material to be treated contains, whereby the surface layer is formed thereon. An apparatus for forming such a surface layer is also provided.

574402

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