Sintered compact for use in machining chemically reactive materials

摘要

A sintered cubic boron nitride (cBN) compact for use in a tool is composed of between about 60 and 80 volume % cBN having a volumetric mean particle size of between about 3 to 6 mu m and between about 40 and 20 volume % of a ceramic binder phase. The ceramic binder is composed of between about 20 and 60 volume % of one or more of a carbide, nitride, or boride of a Group IVB or VIB metal, and between about 40 and 80 volume % of one or more of carbides, nitrides, borides, or oxides of aluminum. The cBN compact additionally contains between about 3 and 15 weight % tungsten. The cBN compacts are especially useful in machining iron and like chemically reactive parts, especially where such parts are powder metal parts.