A cermet having a binder with improved plasticity, a method...

Details A cermet having a binder with improved plasticity, a method... A cermet having a binder with improved plasticity, a method...

C - Chemistry, Metallurgy

22

C

C22C 29/06 (2006.01) C22C 1/10 (2006.01) C22C 19/07 (2006.01)

Patent

CA 2302354

Cermets having a Co-Ni-Fe-binder, a method for the manufacture and use thereof are described. The Co-Ni-Fe-binder comprises about 40 wt.% to 90 wt.% Co, the remainder consisting of Ni, Fe and incidental impurities. The binder is unique in that even when subjected to plastic deformation, it substantially maintains its face centered cubic crystal structure and avoids stress and/or strain induced phase transformations. Stated differently, the Co-Ni-Fe-binder exhibits reduced work hardening. The cermets are used as tools for mining and construction, for machining materials, and as a screw head punch.

L'invention concerne des cermets présentant un liant Co-Ni-Fe, un procédé de production et d'utilisation de ceux-ci. Le liant Co-Ni-Fe comprend environ 40 % en poids à 90 % en poids de Co, le reste étant constitué de Ni, Fe et des impuretés accidentelles. Le liant est unique en ce que même lorsqu'il est soumis à une déformation plastique, il conserve sensiblement sa structure cristalline cubique à faces centrées et il évite les transformations de phases induites par efforts et/ou contraintes. En d'autres termes, le liant Co-Ni-Fe présente un écrouissage réduit. On utilise les cermets en tant qu'outils dans l'extraction minière et la construction, pour des matériaux d'usinage et en tant que poinçon à tête de vis.

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