Hard metal or cermet sintered body and method for the production thereof
AssigneeWidia GmbH
InventorsKlaus Rödiger, Klaus Dreyer, Monika Willert-Porada, Thorsten Gerdes
Life of this patent
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Abstract
A hard metal or cermet sintered body and a method of making it wherein a solid phase containing WC and a binder phase are formed together with WC platelets by direct microwave irradiation, utilizing reactive sintering to form the WC at least in part and to produce the platelets.
Claims12
A hard metal or cermet sintered body consisting of at least one WC-containing hard material phase and a binder phase, and WC platelets embedded therein as a reinforcement and formed by compressing a powder mixture of tungsten and carbon in preparations required for the formation of the hard material phase and the platelets and a binder metal into a shaped body and microwave sintering the body by reactive sintering in a microwave field with an average density of 0.01 to 10 W/cm2.
A microwave sintered hard metal or cermet body consisting of at least one WC-containing metal phase and a binder phase and WC platelets embedded therein and formed by mixing at least tungsten, carbon and a binder metal in powdered form and compressing the mixture to a shaped body and subjecting the shaped body to reactive sintering in a microwave field of 0.01 to 10 W/cm2 energy density and forming the WC platelet with a diameter/thickness ratio of greater than or equal to 3.
A method of producing a hard metal or cermet body which comprises the steps of:
- mixing substances required for forming a hard metal or cermet hard material phase, carbon and a preparation of tungsten sufficient with said carbon for forming WC platelets to be embedded in said body, and optionally other metals, metal carbides and nitrides and/or solid nitrogen compounds supplying carbon and/or nitrogen to form a powder mixture;
- pressing said powder mixture into a shaped body;
- and
- reactively sintering said shaped body in a microwave field of 0.01 to 10 W/cm2 energy density to form a sintered body consisting of at least one WC-containing hard material phase and a binder phase and embedded WC platelets.
Dependencies are inferred from the claim text.