Hard composite and method of making the same

Details Hard composite and method of making the same Hard composite and method of making the same

B - Operations, Transporting

24

D

57/17

B24D 3/06 (2006.01) C04B 35/56 (2006.01) C22C 1/05 (2006.01) C23C 26/00 (2006.01) E21B 10/46 (2006.01) E21C 35/183 (2006.01) E21C 35/18 (2006.01)

Patent

CA 2229032

A method of heat treating a green compact having an exposed surface. The method includes the steps of: providing a green compact comprised of a hard carbide and binder; placing a powder of grain refiner on at least one portion of the exposed surface of the green compact; and heat treating the green compact and grain refiner powder so as to diffuse the grain refiner toward the center of the green compact thereby forming a peripheral zone (80) inwardly from the exposed surface in which the grain refiner was placed, and forming an interior zone (84). The peripheral zone having a grain size that is smaller than the grain size of the bulk zone.

L'invention porte sur un procédé de traitement thermique d'un comprimé cru possédant une surface nue. Le procédé consiste à se munir d'un comprimé cru constitué d'un carbure dur et d'un liant, à déposer une poudre de produit d'affinage du grain sur au moins une partie de la surface nue du comprimé cru et à soumettre à un traitement thermique le comprimé dur et le produit d'affinage du grain pulvérulent de manière à ce que celui-ci diffuse vers le centre du comprimé cru, constituant ainsi une zone périphérique (80) intérieurement à partir de la surface nue sur laquelle a été déposé le produit d'affinage du grain, ainsi qu'une zone interne (84), la grosseur de grain de la zone périphérique étant inférieure à celle de la zone principale.

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