Patent ID: 7896980
Filing Date: 2011-03-01
Classification: C23C

Abstract:
1. A nitriding-oxidizing method for a metal member, comprising the steps of: providing a powdery nitriding agent comprised of 10 to 90% by volume of a powdery nitride compound and 90 to 10% by volume of an inorganic powder, wherein the powdery nitride compound has an average particle size of from 1 to 10 μm and decomposes below a temperature of a nitriding-oxidizing treatment to generate a nitriding gas, and the inorganic powder has an average particle size of from 20 to 100 μm but does not react under the nitriding-oxidizing treatment; and embedding an essential part of the metal member to be nitrided and oxidized into the powdery nitriding agent, wherein the metal member is composed of ferrous alloys or non-ferrous alloys; and then performing the nitriding-oxidizing method at a temperature of 400 to 900° C. for 0.5 to 20 hours while an oxygen-containing gas is always present in the powdery nitriding agent, wherein the inorganic powder comprises at least one of metal oxides, complex metal oxides, ceramics and minerals.