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利用氩弧熔敷技术,在ZL104合金表面原位合成了TiCp/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TiCp/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TiCp/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.
The TiCp / Al composite coating was synthesized in-situ on the surface of ZL104 alloy by argon arc welding technique. The microstructure and properties of the deposited layer were studied by X-ray diffraction, scanning electron microscopy and microhardness tester. Results The results show that the composite coating consists of TiC particles and massive Al3Ti when the content of (Ti + C) is less than 30%. When (Ti + C) is above 30% TiC particles formed in the TiCp / Al composite layer, the size of TiC particles is small, about 1.5μm; TiCp / Al composite layer after argon arc welding TiC distribution evenly, the cladding layer and the matrix Metallurgical bonding, no cracks, porosity and other defects; cladding hardness gradient distribution from the substrate to the surface, the coating hardness of 650 HV0.2, compared with the substrate increased nearly 7 times.