Microdrill bit

Details Microdrill bit Microdrill bit

1989-12-28

1991-04-23

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 18, 428552, 428457, 428220, 51307, 407119, C22C 2908

Patent

active

050097059

ABSTRACT:
A microdrill bit is made of a tungsten carbide based cemented carbide which contains a binder phase of 6% by weight to 14% by weight of a cobalt alloy and a hard dispersed phase of balance tungsten carbide. The cobalt alloy contains cobalt, chromium, vanadium and tungsten and has weight ratios so as to satisfy the relationships of 0.04.ltoreq.(c+d)/(a+b+c+d).ltoreq.0.10 and 0.50.ltoreq.c/(c+d).ltoreq.0.95, where a, b, c and d denote weight ratios of tungsten, cobalt, chromium and vanadium, respectively. The drill bit is formed so as to have a Rockwell A scale hardness of 92.0 to 94.0.

REFERENCES:
patent: 4203262 (1980-05-01), Dunnington et al.
patent: 4276096 (1981-06-01), Kolaska et al.
patent: 4277283 (1981-07-01), Tobioka et al.
patent: 4639352 (1987-01-01), Kodama et al.
patent: 4753678 (1988-06-01), Maruyama et al.
patent: 4923512 (1990-05-01), Timm et al.
patent: 4959929 (1990-10-01), Burnard et al.

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