Sintered compact for use in machining chemically reactive materials
AssigneeDiamond Innovations, Inc.
InventorsRobert Dean Scurlock, Stephen Lee Dole
Life of this patent
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Abstract
A sintered cubic boron nitride (cBN) compact for use in a tool is composed of between about 60 and 80 vol-% cBN having a volumetric mean particle size of between about 3 to 6 μm and between about 40 and 20 vol-% of a ceramic binder phase. The ceramic binder is composed of between about 20 and 60 vol-% of one or more of a carbide, nitride, or boride of a Group IVB or VIB metal, and between about 40 and 80 vol-% of one or more of carbides, nitrides, borides, or oxides of aluminum. The cBN compact additionally contains between about 3 and 15 wt-% tungsten. The cBN compacts are especially useful in machining iron and like chemically reactive parts, especially where such parts are powder metal parts.
Claims19
A sintered cubic boron nitride (cBN) compact for use in a tool, which comprises:
- (a) between about 60 and 80 vol-% cBN having a volumetric mean particle size of between about 3 to 6 μm;
- (b) between about 20 and 40 vol-% of a ceramic binder phase, of which
- (i) between about 20 and 60 vol-% of one or more of carbides, nitrides, or borides of a Group IVB or VIB metals, wherein said one or more carbides, nitrides, or borides is a compound having the formula MXz, where M is a metal from Group IVB or VIB, X is a carbide, nitride or boride and z has a value >0.97;
- (ii) between about 40 and 80 vol-% of one or more of carbides, nitrides, borides, or oxides of aluminum;
- and
- (c) between about 3 and 15 wt-% tungsten.
Process for making a sintered cubic boron nitride (cBN) compact for use in a toot, which comprises subjecting to high pressure and high temperature (HP/HT) conditions a mixture of:
- (a) between about 60 and 80 vol-% cBN having a volumetric mean particle size of between about 3 to 6 μm;
- (b) between about 20 and 40 vol-% of a ceramic binder phase, of which
- (i) between about 20 and 60 vol-% of one or more of carbides, nitrides, or borides of a Group IVB or VIB metals, wherein said one or more carbides, nitrides, or borides is a compound having the formula MXz, where M is a metal from Group IVB or VIB, X is a carbide, nitride or boride and z has a value >0.97;
- (ii) between about 40 and 80 vol-% of one or more of carbides, nitrides, borides, or oxides of aluminum;
- and
- (c) between about 3 and 15 wt-% tungsten.
A method for a machining chemically reactive material, which comprises:
- contacting a chemically reactive material with a sintered cubic boron nitride (cBN) compact far removing at least a portion of said material, said cBN compact comprising:
- (a) between about 60 and 80 vol -% cBN having a volumetric mean particle size of between about 3 to 6 μm;
- (b) between about 20 and 40 vol-% of a ceramic binder phase, of which
- (i) between about 20 and 60 vol-% of one or more of carbides, nitrides, or borides of a Group IVB or VIB metals, wherein said one or more carbides, nitrides, or borides is a compound having the formula MXz, where M is a metal from Group IVB or VIB, X is a carbide, nitride or boride and z has a value >0.97;
- (ii) between about 40 and 80 vol-% of one or more of carbides, nitrides, borides, or oxides of aluminum;
- and
- (c) between about 3 and 15 wt-% tungsten.
Dependencies are inferred from the claim text.