大气等离子喷涂锆酸镧热障涂层

利用自制的稀土元素复合掺杂锆酸镧热喷涂粉末,采用大气等离子喷涂技术,在镍基高温合金表面制备La1.6Nd0.4Ce1.0Zr1.0O7(LNCZ)热障涂层,研究了喷涂参数对涂层沉积率、显微结构、结合强度及抗热震性能的影响。结果表明,增大喷涂功率,降低送粉速率可以有效地提高涂层的沉积率,但对涂层结合和抗热震性能不利。减小喷涂距离不仅提高沉积率,还有利于获得孔径细小、孔隙率适中的层状组织结构,该结构对提高涂层的抗热震性能极为有利。采用DH-1080大气等离子喷涂设备制备LNCZ涂层较好的喷涂条件为:功率40 kW,喷涂距离9 cm,送粉速率12 g/min。

Lanthanum zirconate thermal barrier coating prepared by atmospheric plasma spray

La_(1.6)Nd_(0.4)Ce_(1.0)Zr_(1.0)O_7(LNCZ)thermal barrier coating on Ni-based superalloy was prepared by atmospheric plasma spray with self-developed LNCZ thermal spray powder Effect of process parameters on the deposition ratio,microstructure,bonding strength and thermal-shock resistance of LNCZ coatings was studied The results show that increasing the power or decreasing the feed rate is useful to improve the deposition ratio,but deteriorates the coating′s bonding strength and thermal-shock resistance The deposition ratio increases significantly as decreasing the spray distance Also,the typical lamellar microstructure with appropriate porosity fraction can be obtained by low spray distance And the microstructure is good for thermal-shock resistance The optimum process parameters of LNCZ thermal barrier coating prepared by using DH-1080 equipment are that the power is 40 kW,the spray distance is 9 cm and the feed rate is 12 g/min.