Method of forming a nitride or carbonitride layer

Details Method of forming a nitride or carbonitride layer Method of forming a nitride or carbonitride layer

1993-06-30

1995-08-22

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

427245, 4272552, 4272554, C23C 1644, B05D 122

Patent

active

054436621

ABSTRACT:
A nitride or carbonitride layer is formed on the surface of a metal material as follows: A treating agent composed of a refractory powder of alumina or the like and a powder of a metal for forming a nitride or a carbide or an alloy thereof is disposed in a fluidized bed furnace; the treating agent is fluidized to form a fluidized bed by introducing an inert gas; the fluidized bed furnace is heated to a temperature of not higher than 700.degree. C.; an activator of a halogenated ammonium salt is intermittently supplied into the fluidized bed at a rate of 0.001 to 5 wt %/hour based on the total amount of the treating agent; and the metal material to be treated is disposed in the fluidized bed during or after any of the above steps. For example, a nitride layer composed of only a metal for forming a nitride which contains almost no Fe--N is formed on the surface of iron steel even at a temperature as low as not higher than 700.degree. C. The layer is very hard and efficient in wear resistance, and the toughness of the base metal is hardly lowered.

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Archer, Wear, 48, 237-250, 1978; "Chemical Vapor Deposited Tungsten Carbide Wear-Resistant Coatings Formed at Low Temperatures".

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