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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。
La1.6Nd0.4Ce1.0Zr1.0O7 (LNCZ) thermal barrier coatings were prepared on the surface of Ni-based superalloy by atmospheric plasma spray coating using a homemade rare earth element doped lanthanum zirconate thermal spray powder. The effects of spraying parameters Coating deposition rate, microstructure, bonding strength and thermal shock resistance. The results show that increasing the spraying power and reducing the powder feeding rate can effectively improve the deposition rate of the coating, but not to the coating combination and thermal shock resistance. Reducing the spray distance not only increases the deposition rate, but also helps to obtain a layered structure with small pore size and moderate porosity, which is very beneficial to improve the thermal shock resistance of the coating. The optimum spraying conditions for the preparation of LNCZ coating by DH-1080 atmospheric plasma spraying equipment are: power 40 kW, spraying distance 9 cm, feeding rate 12 g / min.