Santrade, Ltd

Sandvik Ab

Erik T Hartzell

Udo K Fischer

Jan G Akerman

Mats G Waldenstrom

The present invention relates to a cemented carbide body, preferably for rock drilling, mineral cutting and wear parts, in which the content of binder phase in the surface is lower and in the center higher than the nominal content. In the center there is a zone having a uniform content of binder phase. The WC grain size is uniform throughout the body.

Cemented carbide body with a binder phase gradient and method of making

A tool or wear part comprises a cast iron or cast steel body carrying a plurality of cast-in inserts. Each insert comprises a cemented carbide cutting or wearing element partially embedded in the body, and an enclosure completely surrounding the embedded portion of the element. The enclosure is cast-in with respect to the body and has a higher melting point than the body. The enclosure is connected by a metallurgical bond to the body and by a shrink-fit to the element.

Cemented carbide tool

The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. By having the bodies comprising a core of cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone the bodies have obtained an increased strength and life in practical use.

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Alvsjo, Sweden

Erik T Hartzell