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US 6,207,102 B1Granted
Method of sintering cemented carbide bodies
AssigneeSandvik AB
InventorsBarbro Rohlin, Margareta Pålsson
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Abstract
A method of sintering cemented carbide bodies includes heating said bodies to the sintering temperature in a suitable atmosphere and cooling. If said cooling at least to below 1250° C. is performed in a higher speed i.e. at more than 20° C./min cemented carbide bodies with no surface layer of binder phase are obtained. This is an advantage when said bodies are to be coated with wear resistant layers by the use of CVD-, MTCVD- or PVD-technique.
Claims4
A method of making coated cemented carbide bodies with a composition of 4 to 15 weight % Co, up to 20 weight % cubic carbides and rest WC said method including the steps of:
- sintering cemented carbide bodies including heating to a sintering temperature above 1350° C. in an argon atmosphere;
- cooling the bodies in the temperature range from 1350° to 1250° C. at a cooling rate of more than 20° C./min to form binder phase of nominal content on the surface;
- cooling the bodies thereafter in a conventional manner;
- and
- providing the bodies with a thin wear resistant coating including at least one layer by CVD-, MTCVD- or PVD-technique.
2 more elements
Dependencies are inferred from the claim text.