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)

Patent

CA 2229082

A method of heat treating a sintered body having an exposed surface which has the steps of: providing a sintered body comprised of a hard carbide and a binder, the binder being present in the sintered body at a first binder level and the hard carbide in the sintered body being of a first grain size; placing granules of a sacrificial sintered material in contact with at least one portion of the exposed surface of the sintered body, the sacrificial sintered material comprised of the hard carbide and the binder, the binder being present in the sacrificial sintered material at a second binder level and the hard carbide in the sacrificial sintered material being of a second grain size; and heat treating the sintered body and sacrificial sintered material so as to change the binder content in a surface region of the sintered body.

L'invention a trait à un procédé de traitement thermique d'un corps fritté possédant une surface nue. Le procédé consiste à se munir d'un corps fritté constitué d'un carbure dur et d'un liant, ce dernier étant présent dans le corps fritté à un premier niveau et le carbure dur se trouvant dans le corps fritté avec une première grosseur de grain, à déposer des granules d'un matériau fritté perdu sur une partie au moins de la surface nue du corps fritté, ce matériau fritté perdu étant constitué du carbure dur et du liant présents dans ledit matériau à un second niveau et avec une seconde grosseur de grain, respectivement, et enfin, à soumettre à un traitement thermique le corps fritté de manière à modifier la teneur en liant dans la zone superficielle du corps fritté.

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