Method of making a cemented carbide powder with low compacting pressure
AssigneeSandvik AB
InventorMats Waldenström
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Abstract
The present invention relates to a method of making a cemented carbide with submicron WC grain size with a powder metallurgical technique including milling, pressing and sintering. The method includes milling all components except WC for about three hours, then adding the WC powder and milling for about ten additional hours. In this way a cemented carbide powder with acceptable low compacting pressure is obtained.
Claims15
A method of making a submicron cemented carbide powder comprising a plurality of components including submicron WC and binder metal, the powder having a low compacting pressure, the method comprising the steps of:
- (i) pre-milling a mixture of components which does not include the WC for more than 2 hours;
- (ii) adding the WC to the mixture of step (i) and milling for approximately 10 hours;
- and
- (iii) drying the milled mixture to obtain a powder.
A submicron cemented carbide powder having a compacting pressure of less than 200 MPa to obtain no more than 18% shrinkage upon sintering.
A submicron cemented carbide powder having a compacting pressure of less than 200 MPa to obtain no more than 18% shrinkage upon sintering the cemented carbide comprising:
- WC grains having an average size of 0.2-1.0 μm.
Dependencies are inferred from the claim text.