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采用溶胶-凝胶法制备得到含有TiO2、BN和C的复合粉末,将其预置在45钢基体表面,然后通过激光强化原位制备出含有TiN和TiB2颗粒的强化涂层。利用扫描电镜、能谱仪和X射线衍射仪对涂层组织、成分和物相进行了分析,并测试了涂层显微硬度。结果表明,强化涂层与基体结合良好,涂层中无裂纹、气孔等缺陷,原位生成的颗粒状TiN和须状TiB2均匀分布在强化层中。涂层最高硬度达到956 HV0.1,显著地提高了45钢的硬度。
A composite powder containing TiO2, BN and C was prepared by sol-gel method. The composite powder was pre-arranged on the surface of 45 steel substrate. Then, a strengthening coating containing TiN and TiB2 particles was prepared by laser strengthening in situ. The microstructure, composition and phase of the coating were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The microhardness of the coating was also tested. The results show that the strengthened coating has a good bond with the matrix, the coating has no defects such as cracks and pores, and the granular TiN and the whisker TiB2 generated in situ are uniformly distributed in the strengthening layer. The maximum hardness of the coating reached 956 HV0.1, significantly increased the hardness of 45 steel.