Abstract:Co structural failure of copper alloy under the condition of cold-heat cycle occurred when it was applied as thermal management material for a long time. Therefore, it was considered to introduce MAX phase material with low expansion coefficient into the copper alloy to reduce the thermal expansion of the composites. Ti3SiC2 was a three-layer ceramic material with excellent properties of both ceramic and metal, which had the characteristics of self-lubrication, high toughness and high electrical conductivity. As a reinforcing phase, Ti3SiC2 can improve the friction properties of Cu-based composites, then it reduced the thermal expansion coefficient of the composite material, so Ti3SiC2/Cu composites should be widely used in electronic packaging materials, thermal management materials and other fields. In this paper, rare earth oxide La2O3 was introduced into Ti3SiC2/Cu composite to survey the effects of La2O3 doping content on the phase composition, surface morphology, microhardness and friction factor of Ti3SiC2/Cu composites. It was found that the high density Ti3SiC2/Cu composites can be obtained by hot pressing sintering technology, then the relative density was more than 98.5%. After proper La2O3 doping, the microhardness of Ti3SiC2/Cu composites was increased, which can realize the dispersion strengthening of Ti3SiC2/Cu composites. With the increase of La2O3 doping, the friction coefficient of Ti3SiC2/Cu composites decreased first and then increased. Adding Ti3SiC2 to Cu matrix composites can play a lubricating role and was conducive to reducing friction factor. This research can provide experimental basis for the engineering application of Ti3SiC2/Cu composites.