真空熔渗烧结制备耐磨复合涂层组织及性能研究  

Study on the Microstructure and Properties of Wear-resistant Composite Coating Prepared by Vacuum Infiltration Sintering

作　　者：李乐陶 LI Le-tao(School of Aeronautical Manufacturing and Architectural Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造与机械工程学院,南昌330063

出　　处：《中国陶瓷》2024年第12期51-57,共7页China Ceramics

摘　　要：利用真空熔渗烧结工艺,制备含有Cr_(3)C_(2)与TaC陶瓷颗粒的耐磨复合涂层,分析复合涂层的截面形貌、微观组织和力学性能。结果表明,添加Cr_(3)C_(2)与TaC陶瓷颗粒的复合涂层成型良好,复合涂层主要由γ/γ’、Cr_(23)C_(6)、Cr_(7)C_(3)、Cr_(3)Si、TaC和G相构成,复合涂层中的碳化物通常作为G相的形核质点,G相通常呈现出包覆其他析出相的状态。这些析出相使得复合涂层的力学性能大幅提升。当Cr_(3)C_(2)含量为20%时,复合涂层的力学性能达到最优,随着陶瓷颗粒含量的增加,复合涂层的上半部分区域出现了较多的微观孔洞,涂层硬度逐渐下降。添加TaC复合涂层中TaC颗粒分布在涂层颗粒间隙,当TaC含量为20%时,涂层区域硬度达到了1207HV0.2,与添加Cr_(3)C_(2)陶瓷颗粒的复合涂层相比,添加TaC陶瓷颗粒的复合涂层组织分布更加均匀,力学性能提升更加明显。The wear-resistant composite coatings containing Cr_(3)C_(2)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 Cr_(3)C_(2)and TaC ceramic particles exhibits good formation.The primary constituents of the composite coatings includeγ/γ',Cr_(23)C_(6),Cr_(7)C_(3),Cr_(3)Si,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 Cr_(3)C_(2)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 Cr_(3)C_(2)ceramic particles,the microstructure distribution of the composite coating with TaC ceramic particles is more uniform,and the mechanical properties are improved more significantly.

关 键 词：耐磨复合涂层 陶瓷颗粒 力学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]