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以Ni60、TiO2、B4C、C、Al粉为原料,利用激光熔覆技术在45#号钢表面原位合成制备了TiC/TiB2增强的复合涂层,采用金相显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)、维氏硬度计对涂层组织进行测试分析。结果表明:复合涂层内部无裂纹、气孔等缺陷,与基体呈冶金结合;其主要物相为Ni3(Al,Ti)、TiC、TiB2、(Fe,Cr)7C3和α-Fe;激光熔覆过程中原位合成的块状TiC和六边形状TiB2增强相弥散分布在复合涂层中,明显提高了熔覆层显微硬度;涂层显微硬度呈梯度分布,最大可达767Hv0.2,约为基材显微硬度的3倍。
The TiC / TiB2 reinforced composite coating was prepared on the surface of 45 # steel by laser cladding technology with Ni60, TiO2, B4C, C and Al powders as raw materials. The microstructure of the coating was characterized by means of metallographic microscope, scanning electron microscope (SEM) X-ray diffractometer (XRD), Vickers hardness tester to test the coating structure. The results show that there are no defects such as cracks and pores in the composite coating and metallurgical bonding with the matrix. The main phases are Ni3 (Al, Ti), TiC, TiB2, (Fe, Cr) 7C3 and α-Fe. Laser cladding In the process of in-situ synthesis of bulk TiC and hexagonal TiB2 reinforcing phase dispersed in the composite coating, significantly increased the micro-hardness of the coating; micro-hardness gradient coating, up to 767Hv0.2, about 3 times the hardness of the substrate.