摘要 |
PROBLEM TO BE SOLVED: To provide a method by which a carbonitride layer can easily be formed on the surface of a metallic material and to provide a titanium based metallic material provided with high surface hardness and having excellent wear resistance. SOLUTION: Graphite is arranged on the surface of a metallic material, and heating treatment is performed in a nitrogen atmosphere to form a carbonitride layer on the surface of the metallic material. The heating treatment in a nitrogen atmosphere is performed so as to hold the same to a temperature in the range of 1,100 to 1,300 deg.C for 10 to 90 min. The surface of the metallic material composed of a titanium based metal is, as the above carbonitride layer, formed with a titanium carbonitride layer. The titanium based metallic material can be obtained by performing the heating treatment in a nitrogen atmosphere to form the titanium carbonitride layer on the surface of the metallic material, and the surface hardness is >=1,000 Hv by Vickers hardness.
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