| 摘要 |
PROBLEM TO BE SOLVED: To provide a hard material with a composite structure in which adhesion of grain boundaries is improved, and to provide a method for producing the same. SOLUTION: In the hard material produced by liquid phase sintering, the hard material with a composite structure is produced by simultaneously sintering a hard material layer not including titanium carbide and a hard material layer including titanium carbide, wherein the hard material layer not including titanium carbide contains one or more selected from tantalum and niobium. In the method for producing the hard material with the composite structure, a hard material layer not including titanium carbide and a hard material layer including titanium carbide are heated to a temperature at which metals included in both the layers produce liquid phases so as to form a reaction layer on the boundary part of both the layers, thus the quantity of the metals in the grain boundary part is reduced so as to produce the hard material with a composite structure in which the peeling of both the layers is prevented. In this way, the hard material including titanium carbide and the hard material not including titanium carbide are made of different hard materials, thus reaction at the grain boundaries is controlled, and both the hard materials can be simultaneously sintered. COPYRIGHT: (C)2011,JPO&INPIT |
