中国激光, 2012, 39 (2): 0203006, 网络出版: 2012-01-16
激光熔覆Al2O3-13% TiO2陶瓷层制备及其抗热震性能
Study on Al2O3-13% TiO2 Coatings Prepared by Laser Cladding and Thermal Shock Resistance
激光技术 激光熔覆 高频感应 微观结构 热震性能 laser technique Al2O3-13% TiO2 Al2O3-13% TiO2 laser cladding high frequency induction thermal shock resistance
摘要
利用高频感应辅助激光熔覆技术在镍基高温合金基体上制备了NiCoCrAl-Y2O3黏结层及Al2O3-13% TiO2(质量分数)陶瓷层。通过扫描电镜、能谱仪、X 射线衍射仪分析了涂层的微观结构。实验结果表明,在高频感应辅助激光的作用下,基体与黏结层、黏结层与陶瓷层之间的界面均展现了良好的结合特性,具有明显的界面扩散现象。陶瓷层在激光的作用下形成了三维网状结构,该结构使得陶瓷材料中的TiO2 材料与Al2O3材料均匀分布,减少了因不同材料聚集所产生的内应力。同时对涂层进行了热震实验,结果证明了利用高频感应辅助激光熔覆技术制备的Al2O3-13% TiO2陶瓷层具有良好的抗热震性能,适合工作于高温环境。
Abstract
NiCoCrAl-Y2O3 and Al2O3-13% TiO2 (mass fraction) coatings, formed with means of laser cladding on nickel-based alloy, are heated using high frequency induction sources. The coating and the cross-section are analysed by SEM, XRD, and EDS respectively. The results show that, MCrAlY/Al2O3-13% TiO2 ceramic coating has an excellent chemical combination due to elements obvious diffused in the interface. It is found that Al2O3-rich submicron particles embedded in the TiO2-rich matrix, three-dimensional net structure formed in ceramic coating, which could decrease inner stress between different materials. Meanwhile, thermal shock experiment of samples is tested which shows that Al2O3-13% TiO2 ceramic coating have excellent high temperature property.
高雪松, 田宗军, 沈理达, 刘志东, 黄因慧. 激光熔覆Al2O3-13% TiO2陶瓷层制备及其抗热震性能[J]. 中国激光, 2012, 39(2): 0203006. Gao Xuesong, Tian Zongjun, Shen Lida, Liu Zhidong, Huang Yinhui. Study on Al2O3-13% TiO2 Coatings Prepared by Laser Cladding and Thermal Shock Resistance[J]. Chinese Journal of Lasers, 2012, 39(2): 0203006.