METHOD FOR FORMING CARBONITRIDE LAYER ON SURFACE OF METALLIC MATERIAL AND TITANIUM BASED METALLIC MATERIAL PROVIDED WITH CARBONITRIDE LAYER ON SURFACE

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°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.;COPYRIGHT: (C)2002,JPO