Microstructure evolution and tribological behavior of TiC/Ti₂AlC core-shell particle-reinforced composite coatings

Abstract

TiC/Ti₂AlC core-shell structure reinforced Ti-based composite coating was prepared by laser cladding technology. The effect of Ti₂AlC content on the microstructure and mechanical behavior of the coating was studied. The results showed that the reinforced phase was mainly TiC/Ti₂AlC MAX phase core-shell structure at 20% Ti₂AlC content. According to the synthesis mechanism, Ti₂AlC nucleated on TiC through the diffusion of Al atoms to further generate the core-shell structure. The friction and wear test results showed that the wear resistance of the coating was significantly improved under the load distribution effect of the core-shell structure. The friction coefficient decreased to 0.342, and the wear rate reached 8.19×10⁻⁵ mm³/(N·m), which was only 47.07% of TC4 substrate.

Keywords

laser cladding / MAX phase decomposition / core-shell structure / frictional wear

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Central South University