Method for surface treatment

Details Method for surface treatment Method for surface treatment

1988-08-05

1990-01-09

Lawrence, Evan

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

4272552, 4272554, C23C 1644, B05D 122

Patent

active

048927597

ABSTRACT:
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.

REFERENCES:
patent: 4461656 (1984-07-01), Ross
patent: 4569862 (1986-02-01), Arai et al.
patent: 4623400 (1986-11-01), Japka et al.
patent: 4686117 (1987-08-01), Arai et al.
patent: 4786526 (1988-11-01), Arai et al.
patent: 4844949 (1989-07-01), Arai et al.

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