Effect of sintering temperature on microstructure and properties of automative graphite-TiB2 reinforced copper matrix composites
Graphite and TiB2 hybrid reinforced Cu matrix composites were prepared using vacuum hot pressing sintering method.The effect of sintering temperature on microstructure,density,microhardness,conductivity and friction and wear properties of the composites was studied.The results show that during the sintering process,there is no oxidation of each powder raw material,and no chemical reaction occurs between the powders.The two reinforcing phases are uniformly dispersed in the continuous Cu matrix,and no aggregation is formed between the particles.As the sintering temperature increases,the density and microhardness of the composites first increase and then decrease,while the friction coefficient and wear rate first decrease and then increase,and the conductivity gradually decreases.When the sintering temperature is 800℃,the graphite and TiB2 hybrid reinforced Cu matrix composites exhibit excellent comprehensive properties,with density,microhardness,conductivity,friction coefficient and wear rate of 98.8%,92.2 HV0.1,43.2%IACS,0.213 and 1.757×10-5 mm3/(N·m),respectively,and the wear mechanism is mainly micro cutting,supplemented by a small amount of adhesive wear.
Cu matrix compositessintering temperaturemechanical propertycoefficient of frictionwear rate
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