Patent ID: 6918943

Claim:
A machining tool composed of a composite material containing ceramics and metal, comprising: said ceramics containing at least one selected from the group consisting of carbide, nitride, and carbonitride of W, Cr, Mo, Ti, V, Zr, Hf, and lanthanoid, said metal containing at least one selected from the group consisting of Fe, Ni, Co, and alloy comprising two or more of Fe, Ni, and Co, said metal further containing at least one selected from the group consisting of Cr, Mn, V, and Ti, wherein a composition ratio of said ceramics to a composition ratio of said metal is 85:15 to 95:5 by weight, wherein said composition ratio of said ceramics is increased and said composition ratio of said metal is decreased inwardly from a surface of said machining tool, and wherein a degree of train growth of said ceramics inside said machining tool is larger than that of said ceramics in the vicinity of said surface of said machining tool. 2 .The machining tool according to claim 1 , wherein Vickers hardness of said surface of said machining tool is not less than 1700.