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US 4,801,510 AGranted
Alumina coated silcon carbide whisker-alumina composition
AssigneeKennametal Inc.
InventorsPankaj K. Mehrotra, Elizabeth R. Billman
Life of this patent
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Abstract
An article of manufacture is provided having a SiC whisker reinforced alumina matrix substrate which has an alumina coating bonded to its exterior surface. It has been found that these articles are useful as cutting inserts in the high speed rough machining of steels.
Claims40
A coated composite comprising:
- a substrate comprising at least 5, and less than 30, volume percent silicon carbide whiskers;
- and less than about 95, and more than 70, volume percent alumina;
- and an alumina coating bonded to said substrate.
A cutting insert comprising:
- a cutting edge formed at a juncture of a rake surface and a flank surface of said cutting insert;
- said cutting insert having a substrate and an alumina coating bonded to said substrate, said substrate composed of more than 5, and less than 30, volume percent silicon carbide whiskers, and less than 95, and more than 70, volume percent alumina.
A cutting insert comprising:
- a cutting edge formed at the juncture of a rake surface and a flank surface of said cutting insert;
- said cutting insert having a substrate and an alumina coating bonded to said substrate;
- and said substrate containing more than 5, and less than 30, volume percent SiC whiskers distributed in an alumina based matrix.
A cutting insert comprising:
- a cutting edge formed at the juncture of a rake surface and a flank surface of said cutting insert;
- said cutting insert having a substrate and an alumina coating bonded to said substrate;
- and said substrate composition consisting of more than 5, and less than 30, volume percent SiC whiskers distributed in an alumina matrix.
Dependencies are inferred from the claim text.