SINTERED COMPOSITE MATERIAL

摘要

A sintered composite material comprising 20 to 80% by volume of cubic boron nitride grains and a binder, wherein the binder is one which consists of at least one member selected from the group consisting of nitrides, carbides, borides, oxides and solid solutions of Group 4a, 5a and 6a elements of the periodic table, at least one member selected from the group consisting of simple substances, compounds and solid solutions of Zr, Si, Hf, Ge, W, and Co, and an aluminum compound and which is characterized in that when the sintered composite material contains W and/or Co, the total weight of W and/or Co is below 2.0wt% and the material also contains one or more of Zr, Si, Hf and Ge (hereinafter referred to as "X") in an amount of 0.005wt% or above but below 2.0wt% satisfying the relationship: X/(X+W+Co) = 0.01 to 1.0, and that the Al content is 2.0 to 20.0wt%.