热处理对大气等离子喷涂LaTi2Al9O19-Zr0.92Y0.08O1.96 复合涂层粉末的影响

Effect of Heat Treatment on LaTi2Al9O19-Zr0.92Y0.08O1.96 Com-posite Coating Powders by Air Plasma Spraying

摘要:

将纳米/亚微米级Zr_0.92Y_0.08O_1.96（YSZ）增韧稀土复合氧化物LaTi₂Al₉O₁₉（LTA）颗粒通过喷雾干燥制备出喷涂粉体，采用不同温度对其进行煅烧，并研究不同温度的热处理对喷雾干燥粉体的流动性、松装密度和形貌的影响。结果表明：未经热处理的喷雾干燥粉体呈现出疏松结构，粒径为40~80 μm。经过热处理后，LTA-YSZ颗粒之间的结合更加紧密，在1100 ℃下煅烧的粉体具有最好的喷雾特性和形貌。通过等离子喷涂进行沉积制备的LTA-YSZ涂层呈现良好的层状结构，并伴有缺陷。

Abstract:

The nano/submicron scaled spraying powders of lanthanum titanium aluminum oxide LaTi₂Al₉O₁₉ (LTA) toughened by yttria stabilized zirconia Zr_0.92Y_0.08O_1.96 (YSZ) were prepared via spray drying and then calcined at different temperatures. The effect of heat treatment on the flowability, apparent density, and morphology of the spray-dried powders was investigated. Results show that the spray-dried powders have loose structure with the size of 40~80 μm. The cohesion between LTA-YSZ particles becomes stronger after calcination. The spray-dried powders calcined at 1100 °C achieve the optimal spraying characteristics and morphology, and therefore are deposited via air plasma spraying (APS) to obtain LTA-YSZ coatings which show a good lamellar structure with defects.