中国激光, 2018, 45 (7): 0702008, 网络出版: 2018-09-11
激光熔化沉积NiTi基金属间化合物涂层的微结构与性能 下载: 875次
Microstructure and Performance of NiTi-Based Intermetallic Compound Coatings by Laser Melting Deposition
激光技术 激光熔化沉积 金属间化合物 耐蚀性能 点蚀 钛合金 laser technique laser melting deposition intermetallic compound corrosion resistance pitting titanium alloys
摘要
通过激光熔化沉积技术,在Ti-6Al-4V(TC4)基材表面原位合成了NiTi基金属间化合物涂层,并研究了其微结构特征、显微硬度和电化学腐蚀性能。研究结果表明,涂层主要由NiTi、Ni3Ti、NiTi2和Ni4Ti3等金属间化合物组成;涂层的显微硬度达到800 HV,比TC4基材的提高了约1.3倍;涂层表面生成了不均匀钝化膜,出现大量点蚀,故该涂层的耐蚀性能与TC4基材的相比略有下降。
Abstract
The NiTi-based intermetallic compound coating is in-situ synthesized on the surface of Ti-6Al-4V (TC4) substrate by the laser melting deposition (LMP) technique. The microstructure characteristics, microhardness and electrochemical corrosion resistance of this coating are investigated. The research results show that, this coating is mainly composed of the intermetallic compounds as NiTi, Ni3Ti, NiTi2, Ni4Ti3 and so on. The microhardness of this coating is up to 800 HV, which is about 1.3 times higher than that of the TC4 substrate. Inhomogeneous passive films are formed on the surface of the coating and there also exist many pittings, and thus there is a slight decrease in corrosion resistance of this coating compared with that of the TC4 substrate.
戴晓琴, 石全举, 赵宇, 许永波, 雷剑波, 周圣丰. 激光熔化沉积NiTi基金属间化合物涂层的微结构与性能[J]. 中国激光, 2018, 45(7): 0702008. Xiaoqin Dai, Quanju Shi, Yu Zhao, Yongbo Xu, Jianbo Lei, Shengfeng Zhou. Microstructure and Performance of NiTi-Based Intermetallic Compound Coatings by Laser Melting Deposition[J]. Chinese Journal of Lasers, 2018, 45(7): 0702008.