发明名称 |
Method of forming a nitride or carbonitride layer |
摘要 |
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 DEG 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 DEG 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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申请公布号 |
US5443662(A) |
申请公布日期 |
1995.08.22 |
申请号 |
US19930084322 |
申请日期 |
1993.06.30 |
申请人 |
KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO |
发明人 |
ARAI, TOHRU;NAKANISHI, KAZUYUKI;TAKEDA, HIROMASA;TACHIKAWA, HIDEO |
分类号 |
C23C8/06;C23C8/24;C23C8/30;C23C16/442;(IPC1-7):C23C16/44;B05D1/22 |
主分类号 |
C23C8/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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