应用激光, 2015, 35 (2): 166, 网络出版: 2015-05-20  

锆合金表面激光熔覆TiN/ZrN复合陶瓷涂层的研究

Studying on Laser Cladding TiN/ZrN Composite Ceramic Layer on Zirconium Alloy
作者单位
1 南华大学机械工程学院, 湖南 衡阳 421001
2 南华大学电气工程学院, 湖南 衡阳 421001
摘要
为提高锆合金表面的耐摩擦、耐腐蚀性能, 研究在锆合金表面激光熔覆TiN粉末, 制备TiN/ZrN陶瓷涂层。采用扫描电镜(SEM)、X射线衍射仪(XRD)、能量散射X射线谱仪(EDX), 分别分析了熔覆层的显微组织形貌、成分与相结构, 测试了激光熔覆层的显微硬度。结果表明, 在适当的工艺参数下, 可制备出没有裂纹、气孔和表面质量良好的熔覆层。熔覆层的表层有大量密集生长的树枝晶组织, 中层开始出现颗粒状和块状的组织, 结合区有少量的纤维状组织, 且熔覆层主要由Zr、ZrN、TiN等相组成。激光熔覆层硬度值从表及里呈递减变化, 熔凝层的硬度最高达到863 HV0.1, 是锆合金基体(约为180 HV0.1)的4.8倍。
Abstract
The TiN/ZrN composite ceramic coating was manufactured by laser cladding TiN powder on Zr alloy surface to improve the surface property of friction resistance and corrosion resistance. Micro-structure morphology, composition and phase distributions of the composite coating are investigated by scan electron microscopy(SEM), energy-dispersive X-ray spectroscopy(EDX), X-ray diffraction(XRD), respectively. The micro-hardness of the ceramic layer is also measured. The results show that the TiN/ZrN ceramic coating with good surface quality can be formed by using appropriate experimental parameters. On the surface of the cladding layer, there is a large number of dense growth of dentritic structure; on the middle zone, granular and massive tissue began to appear; On the combining region, there exist a small amount of fibrous tissue. The coating is mainly composed of Zr, ZrN, TiN. The microhardness of the cladding from the surface to the bottom of the clad coating changed gradually, and the highest hardness of the cladding reaches 863 HV0.1,which is 4.8 times of the substrate(about 180 HV0.1).

陈科培, 陈志勇, 刘丹, 唐翠, 朱卫华, 何彬, 王新林. 锆合金表面激光熔覆TiN/ZrN复合陶瓷涂层的研究[J]. 应用激光, 2015, 35(2): 166. Chen Kepei, Chen Zhiyong, Liu Dan, Tang Cui, Zhu Weihua, He Bin, Wang Xinlin. Studying on Laser Cladding TiN/ZrN Composite Ceramic Layer on Zirconium Alloy[J]. APPLIED LASER, 2015, 35(2): 166.

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