Abstract: The present invention relates to a method of producing a sintered body comprising one or more hard constituents and a binder phase based on cobalt, nickel and/or iron by powder metallurgical methods milling, pressing and sintering of powders. At least part of the binderphase powder consists of non-agglomerated particles of spheroidal morphology having dimensions of 0.1 to 20 .mu.m.
Type:
Grant
Filed:
July 6, 1995
Date of Patent:
April 8, 1997
Assignees:
Sandvik AB, Eurotungstene Poudres S.A.
Inventors:
Stefan Ederyd, Jan kerman, Robert Beaufoy, Michael Carpenter, Maxime Bonneau, Jacques Pillot
Abstract: A process for the production of hard materials wherein hard constituent powders are coated with cobalt and/or nickel metal in solution by reducing the metals from a suitable compound such as an oxide, hydroxide or salt with a polyol while keeping the powder in suspension. The polyol functions both as a solvent and a reducing agent at the same time and is present in an amount of at least 5 times more moles polyol than moles metal. There is obtained an even distribution of the cobalt and/or nickel over the surface of the hard constituent powder without the formation of islands of pure metal.
Type:
Grant
Filed:
March 29, 1995
Date of Patent:
June 25, 1996
Assignees:
Sandvik AB, Eurotungstene Poudres S.A.
Inventors:
Maxime Bonneau, Nicolas Chardon, Sara Andersson, Mamoun Muhammed