Method of surface treatment and apparatus used therefor

Details Method of surface treatment and apparatus used therefor Method of surface treatment and apparatus used therefor

1988-09-23

1989-07-04

Beck, Shrive

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

118717, 118429, 118DIG5, 427249, 4272552, 4272554, 148278, 148240, C23C 1600

Patent

active

048449490

ABSTRACT:
A method of forming a surface layer of carbide, nitride, carbonitride, or solid-solution on the surface of a material to be treated, which comprises disposing in a fluidized bed furnace a treating agent comprising a powder of a refractory material, and a powder of a metal for forming a carbide, nitride, carbonitride or solid-solution or a powder of an alloy thereof, introducing a fluidizing gas into the fluidized bed furnace to fluidize the treating agent and form a fluidized layer, disposing the material to be treated in the fluidized layer, and introducing a predetermined amount of halide into the fluidized layer, and an apparatus for forming the surface layer on the material to be treated, comprising a furnace body for forming the surface layer in the fluidized layer of the treating agent, a heating furnace for heating the fluidized layer, a halide supply pipe in communication with the outside of the furnace body, and a halide gas jetting pipe disposed within the furnace body, which is connected to the halide supply pipe and has a plurality of apertures opened into the fluidized layer.

REFERENCES:
patent: 3579373 (1971-05-01), Pingel
patent: 4569862 (1986-02-01), Arai et al.
patent: 4585673 (1986-04-01), Sigai
patent: 4623400 (1986-11-01), Japka et al.
patent: 4637837 (1987-01-01), Von Matuschka et al.
patent: 4686117 (1987-08-01), Arai et al.

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