液相等离子喷涂制备纳米ZrO2/Y2O3涂层的研究

传统的喷涂技术制备的ZrO2/Y2O3涂层存在原料需团聚烧结致密,纳米晶粒不定和物理性能不佳等缺点.采用一种新型的液相等离子喷涂法制备了纳米氧化锆热障涂层,初步分析了液相前驱体液滴在等离子焰流中和基体表面的沉积变化过程,研究了雾化液滴尺寸对纳米氧化锆涂层的显微结构,特别是其相结构的影响;同时分析了纳米氧化锆涂层的抗热震循环性能.结果表明,纳米氧化锆涂层可以承受1 000多次的热循环试验,具有优良的抗热震性能.

Microstructure and Thermal-Shocking Resistance of Nanostructured Zirconia Coating Prepared by Solution Precursor Plasma Spraying

Nanostructured zirconia thermal barrier coating was prepared using solution precursor plasma spraying process.The transformation and deposition process of the solution precursor in the plasma flame and on the substrate were primarily investigated.The effect of the size of the mist-like droplet on the microstructure and phase structure,in particular,of the nanometer zirconia coating was examined.At the same time,the thermal-shocking resistance of the nanostructured zirconia coating was also evaluated using cyclic thermal-shocking test.It was found that the microstructure and phase structure of the nanostructured zirconia coating were closely related to the solution precursor plasma spraying process,especially,to the size of the mist-like droplet.Moreover,the as-deposited nanostructrued zirconia coating had good thermal-shocking resistance.