| 摘要 |
PROBLEM TO BE SOLVED: To provide a treatment method where the temperature range of nitriding/oxidizing treatment is wide, the thermal fatigue resistance of hot tool steel can be improved, the dimensional precision of a workpiece can be retained, a ferrous alloy and a nonferrous alloy having a passive film can be nitrided, the seizure and erosion reaction between the ferrous alloy and the nonferrous alloy can be suppressed, and the problems of heat cracks and seizure/erosion in a die for aluminum alloy casting can be solved. SOLUTION: In the nitriding/oxidizing treatment method for a metal member, the part requiring nitriding/oxidizing treatment in a metal member is buried in solid nitriding agent powder composed of solid nitrogen compound powder decomposed at a temperature less than a nitriding/oxidizing treatment temperature and capable of generating nitriding gas and inorganic matter powder not changed under nitriding/oxidizing treatment conditions, and nitriding/oxidizing treatment is performed while an oxygen-containing gas is always made present within voids in the solid nitriding agent powder, and, if required, the metal member subjected to the nitriding/oxidizing treatment is subjected to oxidizing treatment in an oxygen-containing atmosphere. COPYRIGHT: (C)2008,JPO&INPIT
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