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

1993-09-22

1995-03-28

Derrington, James

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 11, 419 15, 419 18, 419 38, B22F 312

Patent

active

054014611

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 pan 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: 4743515 (1988-05-01), Fischer
patent: 5158148 (1992-10-01), Keshavan

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