Cemented carbide body used preferably for abrasive rock drilling

Details Cemented carbide body used preferably for abrasive rock drilling Cemented carbide body used preferably for abrasive rock drilling

1992-02-18

1994-02-15

Turner, A. A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

51307, 51309, 428457, 428469, 428697, 428698, 428699, 428547, 428552, 428565, B32B 1504

Patent

active

052865495

ABSTRACT:
The present invention relates to cemented carbide bodies preferably for wear demanding rock drilling and mineral cutting. The bodies are built up of a core of eta-phase-containing cemented carbide surrounded by a surface zone free of eta-phase where the binder phase content in the outer part of said zone is lower than the nominal and, in addition, constant or near constant, and the binder phase content in the inner part of the eta-phase free zone closer to the eta-phase core is higher than the nominal. According to the method of the invention, bodies comprising evenly distributed eta-phase are subjected to a partly carburizing treatment with a carbon activity, a.sub.c, close to 1.

REFERENCES:
patent: 3909895 (1975-10-01), Abrahamson et al.
patent: 4610931 (1986-09-01), Nemeth et al.
patent: 4705124 (1987-11-01), Abrahamson et al.
patent: 4743515 (1988-05-01), Fischer et al.
patent: 4820482 (1989-04-01), Fischer et al.

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