Cemented carbide insert
AssigneeSandvik AB
InventorsAnders Lenander, Mikael Lindholm
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Abstract
Methods of making a coated cemented carbide body include: forming a powder mixture having WC, 5-12 wt % Co, 3-11% cubic carbides of Ta and Ti with a ratio of Ta/Ti is 1.0-4.0; adding N in an amount of 0.6-2.0% of the weight of Ta and Ti; milling and spray-drying the mixture to form a powder; compacting and sintering the powder at a temperature of 1300-1500° C., in a controlled atmosphere of about 50 mbar followed by cooling, whereby a body having a binder phase enriched and essentially gamma-phase free surface zone of 5-50 μm in thickness is obtained; applying a pre-coating treatment to the body; and appling a hard, wear-resistant coating to the body.
Claims5
A method of making a coated cemented carbide body having a gamma phase-free and binder rich surface zone comprising the steps of:
- (i) forming a powder mixture comprising WC, 5-12 wt. % Co, 3-11 wt. % cubic carbides of Ta and Ti, where the ratio of Ta/Ti is 1.0-4.0;
- (ii) adding N in an amount of 0.6-2.0% of the weight of Ta and Ti;
- (iii) milling and spray drying the mixture to form a powder material with the desired properties;
- (iv) compacting and sintering the powder material at a temperature of 1300-1500° C., in a controlled atmosphere of about 50 mbar followed by cooling, whereby a body having a binder phase enriched and essentially gamma phase free surface zone of 5-50 μm in thickness is obtained;
- (v) applying a pre-coating treatment to the body;
- and
- (vi) applying a hard, wear resistant coating.
Dependencies are inferred from the claim text.