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以自制的高纯Cr_2AlC陶瓷粉体为原料,采用冷压真空烧结技术制备了Cu-15%Cr_2AlC(质量分数)复合材料。研究了不同压制压力、烧结温度及烧结时间对复合材料的电阻率、热导率、摩擦因数以及材料的断裂方式和组织结构的影响。结果表明:随着压制压力的增大、烧结温度的升高,复合材料的电阻率、摩擦因数呈下降趋势,热导率逐渐升高;随着烧结时间延长,复合材料的电阻率逐渐降低,摩擦因数先降低后升高,热导率先升高后降低;复合材料的断裂方式均为脆性断裂;随着烧结温度的提高、烧结时间的延长,Cr_2AlC与Cu发生固溶强化效应,引起Cr_2AlC晶格常数畸变。
The Cu-15% Cr 2 AlC (mass fraction) composites were prepared by self-made high-purity Cr 2 AlC ceramic powders by cold vacuum sintering. The effects of different pressing pressure, sintering temperature and sintering time on the resistivity, thermal conductivity, friction coefficient, fracture mode and microstructure of the composites were investigated. The results show that the resistivity and friction coefficient of composite decrease with the increase of pressing pressure and sintering temperature, and the thermal conductivity increases gradually. With the sintering time prolonging, the resistivity of composite decreases gradually, The friction coefficient first decreased and then increased, and the thermal conductivity first increased and then decreased. The fracture modes of the composites were brittle fracture. With the increase of sintering temperature and sintering time, the solid solution strengthening effect of Cr 2 AlC and Cu caused the Cr 2 AlC crystal Lattice constant distortion.