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US 5,398,455 AGranted
Grinding tool
AssigneeUnited Technologies Corporation
InventorsThomas P. Slavin, James D. Campbell
Life of this patent
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Abstract
A hafnium nitride coating is applied over the cubic boron nitride layer of conventional CBN tools by the process of arc physical-vapor-deposition at temperatures below the tempering temperature of the core metal. The hafnium nitride coating protects the cubic boron nitride or diamond abrasive and the core, resulting in a grinding tool with greater strength and longer life.
Claims7
A grinding tool consisting essentially of:
- a hard core with a grinding surface;
- a layer of diamond or cubic boron nitride particles adhering to the grinding surface;
- and a coating of hafnium nitride or hafnium carbide covering the particles and grinding surface,
- wherein a bonding metal adheres the particles to the grinding surface and the hafnium-based coating also covers the bonding metal.
1 more element
A grinding wheel consisting essentially of:
- a hard metallic core with a grinding surface;
- a coating of cubic boron nitride particles adhering to the grinding surface;
- and
- a coating of hafnium nitride covering the particles and grinding surface,
- wherein a bonding metal adheres the particles to the grinding surface and the hafnium coating also covers the bonding metal.
2 more elements
Dependencies are inferred from the claim text.