COMPOSITE MEMBER EXCELLENT IN WEAR RESISTANCE AND THERMAL SHOCK RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a composite member such as a hot-forming roll and a hot-working die, which is excellent in wear resistance, thermal shock resistance and thermal fatigue resistance.;SOLUTION: A ground layer which has a layer thickness of 1-5 μm and is composed of a kind of a metal layer of any of Ti, Zr and Hf is formed on the surface of a base material which is composed of cemented carbide, die steel or tool steel, a surface layer which has a thickness of 1-20 μm and is composed of a composite nitride layer of Ti and Al expressed by composition formula of (Ti₁-_xAl_x)N (where, x is an atomic ratio and 0.3≤x≤0.7) is formed on the surface of the ground layer, and a thermal load and a thermal strain between the surface layer and the base material are alleviated using a heat resistant ground layer. Thereby the generation of cracks on the surface of the base material is prevented by raising heat shock resistance without degrading wear resistance.;COPYRIGHT: (C)2013,JPO&INPIT