氩弧熔敷原位合成TiCp/Al基复合涂层组织及性能分析

Microstructure and properties of TiCp/Al composite coating by argon arc cladding

关键词:  氩弧熔敷  原位合成  TiC  复合涂层

Key words:  argon arc cladding  in-situ synthesis  TiC  composite coating

摘要:

利用氩弧熔敷技术,在ZL104合金表面原位合成了TiC_p/Al复合材料涂层,利用X射线衍射、扫描电子显微镜及显微硬度计,研究了熔敷层的显微组织及性能.结果表明,(Ti+C)含量在30%以下时,复合材料涂层组织由TiC颗粒和块状的Al₃Ti组成;当(Ti+C)含量在30%以上时,氩弧熔敷过程中可以充分反应合成TiC颗粒;在所形成的TiC_p/Al复合材料层中,TiC颗粒尺寸细小,约为1.5μm;经氩弧熔敷后的TiC_p/Al复合材料层中TiC分布均匀,熔敷层与基体呈冶金结合,无裂纹、气孔等缺陷;熔敷层硬度从基体到表面呈梯度分布,涂层的显微硬度达到650 HV0.2,较基体提高近7倍.

Abstract:

By using argon arc cladding,TiC_p/Al composites coating was in-situ synthesized on the ZL104 alloy surface.The microstructures and properties of the composites coatings were investigated by X-ray diffractometer,scanning electron microscope and microhardness tester.The results show that if the content of(Ti+C) is less than 30% during argon arc cladding,both TiC particle and Al₃Ti compounds can be found.If the content of(Ti+C) is more than 30% during argon arc cladding,the fine TiC particles of 1.5 μm in size can be completely synthesized.The uniform and continuous excellent metallurgical bonding without defects between the coating and the ZL104 substrate was obtained and the particles were dispersively distributed in the coating.The microhardness of the coatings enhanced by the TiC particles can reach 650 HV0.2,which is about 7 times higher than that of the ZL104 alloy.