Al2O3 coated cutting tool
The present invention relates to a cutting tool for metal machining, comprising at least one body containing PCBN, (polycrystalline cubic boron nitride), with or without cemented carbide backing, and a hard and wear resistant refractory coating on the surface of said body. The coating is adherently...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
07.05.2002
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| Online Access | Get full text |
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| Summary: | The present invention relates to a cutting tool for metal machining, comprising at least one body containing PCBN, (polycrystalline cubic boron nitride), with or without cemented carbide backing, and a hard and wear resistant refractory coating on the surface of said body. The coating is adherently bonded to the body and covers all functional parts thereof. The coating is composed of one or more layers of refractory compounds of which at least one layer consists of fine-crystalline -Al
O
, deposited by Plasma Activated CVD-methods (PACVD).
The present invention describes a coated CBN cutting tool for metal machining. The tool is composed of one or more CBN bodies with or without a cemented carbide backing. The coating comprises one or more layers of refractory compounds of which at least one layer consists of fine-grained, crystalline -phase alumina, AlO, with a grain give less than 0.1 m. The -phase alumina is deposited with a Plasma Activated Chemical Vapor Deposition (PACVD) process in which the plasma is produced by applying a bipolar pulsed DC voltage across two electrodes to which the tool substrates to be coated are fixtured and electrically connected. |
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