A graphene and cobalt reverse gradient tungsten carbide hard alloy and its preparation method

Abstract

The present invention provides a graphene and cobalt reverse gradient tungsten carbide cemented carbide and a preparation method thereof, which belongs to the technical field of gradient cemented carbide preparation. The preparation method provided by the present invention comprises the following steps: WC-Co cemented carbide powder is subjected to a first vacuum hot pressing sintering to obtain a prefabricated WC-Co cemented carbide; the prefabricated WC-Co cemented carbide is subjected to a first ultrasonic treatment and a second ultrasonic treatment in sequence to obtain a graphene / WC-Co cemented carbide; the treatment liquid of the first ultrasonic treatment is anhydrous ethanol; the treatment liquid of the second ultrasonic treatment is a graphene dispersion liquid; the graphene / WC-Co cemented carbide is subjected to a second vacuum hot pressing sintering to obtain the graphene and cobalt reverse gradient tungsten carbide cemented carbide. The graphene and cobalt reverse gradient tungsten carbide prepared by the preparation method provided by the present invention has high hardness, high wear resistance and high toughness at the same time.

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