Study on the Microstructure and Properties of Wear-resistant Composite Coating Prepared by Vacuum Infiltration Sintering
The wear-resistant composite coatings containing Cr3C2 and TaC ceramic particles were prepared by a vacuum infiltration sintering process,and the cross-sectional morphology,microstructure and mechanical properties of the composite coating were analyzed. The results show that the composite coating with the addition of Cr3C2 and TaC ceramic particles exhibits good formation. The primary constituents of the composite coatings include γ/γ',Cr23C6,Cr7C3,Cr3Si,TaC and G phase. The carbides in the composite coating are usually nucleated particles of the G phase,which generally appears to encapsulate other precipitated phases. These precipitated phases greatly improve the mechanical properties of the composite coating. When the content of Cr3C2 is 20％,the mechanical properties of the composite coating reach their optimal levels;however,with an increasing content of ceramic particles,more microscopic holes appear in the upper part of the composite coating,leading to a gradual decrease in hardness. The TaC particles of the composite coating are dispersed in the gaps between the coating particles. When the TaC content is 20％,the coating hardness reaches 1207HV0.2. Compared to the composite coating with Cr3C2 ceramic particles,the microstructure distribution of the composite coating with TaC ceramic particles is more uniform,and the mechanical properties are improved more significantly.
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