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US RE40,785 E1Granted
Method of making a submicron cemented carbide with increased toughness
AssigneeSandvik Intellectual Property Aktiebolag
InventorMats Waldenstrom
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Abstract
The present invention relates to a method of making a cemented carbide comprising WC, 6-12 wt. % Co and 0.1-0.7 wt. % Cr, wherein the WC-grains are coated with Cr prior to mixing and no milling takes place during the mixing step. As a result a cemented carbide with improved properties is obtained.
Claims13
A method of manufacturing a cemented-carbide powder, comprising the steps of:
- (i) coating a hard constituent powder comprising WC with a coating selected from the group consisting of Cr and Cr+Co to form a coated hard constituent powder;
- (ii) wet-mixing, without milling, the coated WC-powder with binder metal and pressing agent, to form a wet-mixed powder;
- and
- (iii) drying said wet-mixed powder to form a dried cemented carbide powder;
- (iv) pressing the dried cemented carbide powder to form a shaped body;
- and
- (v) sintering the shaped body,
- wherein the dried cemented carbide powder has a CW-ratio of 0.8 to 1.0, where the CW-ratio is defined as
- CW-ratio=Ms/(wt. % Co*0.0161)
- where Ms is the saturation magnetization of the sintered cemented carbide body in hAm2/kg and wt % Co is the weight percentage of Co in the cemented carbide.
7 more elements
Dependencies are inferred from the claim text.