Cemented carbide body used preferably for mining abrasive rock.

摘要

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 that 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 according to the invention bodies comprising evenly distributed eta-phase are subjected to a partly carburizing treatment with a carbon activity, ac, close to 1.