激光复合溶胶-凝胶法制备TiN-TiB<sub>2</sub>强化涂层的组织与性能

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。

Abstract

The compound powder consisted of TiO2、BN and graphitic was prepared by sol-gel method at first, and was preplaced on the surface of 45 steel substrate, and then was irradiated by high density laser to get the enhanced coating with TiN and TiB2 in this paper. The microstructures, elements composition and phases were investigated by scanning electron microscope, spectrum analyzer and x-ray diffraction respectively. The microhardness of the coating was tested as well. The results show that the coating has a good combination with the matrix and no cracks, holes and other defects. The granular TiN and whisker TiB2 which were in situ generated are uniformly distributed in the hardened layer. The hardness of the coating is up to 956 HV0.1, which shows that the hybrid strengthening technique significantly improves the hardness of the matrix.

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张群莉, 曾启, 姚建华, 潘颐. 激光复合溶胶-凝胶法制备TiN-TiB₂强化涂层的组织与性能[J]. 应用激光, 2012, 32(6): 469. Zhang Qunli, Zeng Qi, Yao Jianhua, Pan Yi. Microstructure and Property of TiN-TiB2 Hardened Coating Prepared by Hybrid Method Combined Sol-Gel with Laser Hardening[J]. APPLIED LASER, 2012, 32(6): 469.

激光复合溶胶-凝胶法制备TiN-TiB₂强化涂层的组织与性能

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