首先采用合金化法制备了铜-铬基体合金粉,然后向其中加入质量分数为10%的石墨粉和不同含量的纳米AlN粉,制备了不同含量纳米AlN颗粒增强的石墨/铜-0.6%铬复合材料,研究了纳米AlN含量对复合材料密度、电阻率、硬度、抗弯强度及磨擦磨损性能的影响.结果表明:随着纳米AlN含量的增加,复合材料的抗弯强度及硬度逐渐增加,密度和导电性逐渐降低,磨损量逐渐减少,摩擦因数变化不大;当纳米AlN质量分数为0.5%时,可在保证不过多降低导电性的前提下,有效提高复合材料的抗弯强度和耐磨性.

First Cu-Cr alloy powders were prepared by alloying method,and then nano-AlN particles strengthened graphite/Cu-0.6%Cr composites were gained by adding of 10% graphite particles and different content of AlN particles into the Cu-Cr alloy.The influence of nano-AlN content on the density,conductivity,hardness,bending strength,wear and friction properties of the composites was studied.The results show that with the increase of nano-AlN content,the hardness and bending strength increased,the density,conductivity and wear mass loss decreased,and friction coefficient changed little.When the nano-AlN content was 0.5%,the bending strength and wear resisting property of the composite could be improved effectively in the premise of not reducing the electrical conductivity too much.