Preparation of WC-3%Co Cemented Carbide at High Temperature and High Pressure and Characterization of its Physical and Mechanical Properties
High temperature and high pressure method,an effective method for synthesizing gems,has the advantages of ultra-high isostatic pressure and short synthesis time in the preparation of composite materials.In this paper,WC-3％Co cemented carbide was prepared at high temperature and high pressure,and the phase composition and mechanical properties of the cemented carbide samples were characterized by using tools including a universal testing machine,an X-ray diffractometer(XRD),and a microhardness tester.The effects of sintering temperature on the phase and physical and mechanical properties of WC-3％Co cemented carbide were investigated.The results show that sintering at high temperature and high pressure can ensure that the prepared cemented carbide samples are pure WC and Co phases;the relative density of the samples increases with the increase of temperature and can reach 99.3％at 1 450℃;the hardness,bending strength and fracture toughness of the samples increase firstly and then decrease with the increase in sintering temperature.WC-Co cemented carbide samples prepared at 1 400 ℃ have excellent mechanical properties,of which bending strength reaches 2 230 MPa,hardness reaches 22.78 GPa and fracture toughness reaches 11.9 MPa·m1/2.
high temperature and high pressuresintering temperatureWC-Cocemented carbidephysical and mechanical property
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