| 摘要 |
PURPOSE: A sintered compact for use in machining chemically reactive materials is provided to improve the performance of cubic boron nitride(cBN) superabrasive tools for material removal operations. CONSTITUTION: The sintered cubic boron nitride(cBN) compact for use in a tool comprises (a) from 60 to 80 volume% cBN having a volumetric mean particle size of about 3 to 6 μm; (b) from about 40 to 20 volume% of a ceramic binder phase, of which (i) about 20 to 60 volume% is one or more of carbides, nitrides, or borides of a Group IVB or VIB metals; and (ii) about 40 to 80 volume% is one or more of carbides, nitrides, borides, or oxides of aluminum; and (c) from about 3 to 15 weight% tungsten. The process for making a sintered cubic boron nitride(cBN) compact for use in a tool comprises subjecting to high pressure and high temperature(HP/HT) conditions a mixture of: (a) about 60 to 80 volume% cBN having a volumetric mean particle size of between about 3 to 6 μm; (b) about 40 to 20 volume% of a ceramic binder phase of which (i) about 20 to 60 volume% is one or more of carbides, nitrides, or borides of a Group IVB or VIB metals; and (ii) about 40 to 80 volume% is one or more of carbides, nitrides, borides, or oxides of aluminum; and (c) about 3 to 15 weight% tungsten. |
