Drill bit having a diamond-coated sintered body

Details Drill bit having a diamond-coated sintered body Drill bit having a diamond-coated sintered body

1991-04-25

1992-08-11

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool having crystalline cutting edge

51295, 51308, 1754202, 407110, 407119, 408144, 408233, 408713, 501 90, B23B 5100, B23B 2720

Patent

active

051373980

ABSTRACT:
A drill bit of a diamond-coated sintered body has a substrate mainly composed of Si.sub.3 N.sub.4 or SiC. At least a wear portion of the bit is coated with a diamond layer. If the bit is of the throw-away kind, an insert is removably secured to a shank. At least the insert or a wear portion thereof is coated with a diamond layer. The sintered body contains a prescribed amount of a sintering assistant or aid selected from MgO, Y.sub.2 O.sub.3 and the like. The diamond coating layer has a thickness of at least 0.1 .mu.m.

REFERENCES:
patent: 4744704 (1988-05-01), Galvefors
patent: 4909677 (1990-03-01), Noguchi et al.

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