초록 ▼

A method of forming a layer of the carbide of titanium, vanadium, etc. on the surface of an article containing carbon by employing a fluidized bed furnace. The formation of the layer is effected by disposing in the furnace a coating agent prepared from a refractory powder, a carbide forming powder c

A method of forming a layer of the carbide of titanium, vanadium, etc. on the surface of an article containing carbon by employing a fluidized bed furnace. The formation of the layer is effected by disposing in the furnace a coating agent prepared from a refractory powder, a carbide forming powder composed of at least one carbide forming metal or alloy and a halide powder, and the article, and introducing a fluidizing gas into the furnace under heat to fluidize the agent. This method enables the safe and rapid formation of a carbide layer having a uniform thickness and smooth surface.

대표청구항 ▼

A method of using a fluidized bed to form a carbide layer on the surface of a carbon-containing article, which comprises the steps of: (a) disposing the article and a coating agent in a fluidized bed furnace, (b) introducing a fluidizing gas into the furnace under heat to fluidize the coating agent,

A method of using a fluidized bed to form a carbide layer on the surface of a carbon-containing article, which comprises the steps of: (a) disposing the article and a coating agent in a fluidized bed furnace, (b) introducing a fluidizing gas into the furnace under heat to fluidize the coating agent, and (c) heating the coating agent to a treating temperature in the range of from 700°to 1200°C. said coating agent comprising: a fluidizable refractory powder, a carbide-forming powder composed of at least one carbide-forming metal or alloy and a halide powder composed of at least one of a halogenated ammonium salt and a metal halide which is sublimable or vaporizable at a temperature which is not in excess of the treating temperature.