Al2O3包覆ZrO2粉体制备的热障涂层材料的结构与性能  

Structure and Properties of Thermal Barrier Coating Prepared by Alumina Coated Zirconia Composite Powder

作　　者：易中周[1] 单科[1] 翟凤瑞[1] 李楠[1] 谢志鹏[2] YI Zhongzhou1, SHAN Ke1, ZHAI Fengrui1, LI Nan1, XIE Zhipeng2(1. College of Science, Honghe University, Mengzi 661199, Yunnan, China; 2. State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, Chin)

机构地区：[1]红河学院理学院,云南蒙自661199 [2]清华大学,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《硅酸盐学报》2018年第3期328-332,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51362011;51762015;51562009);红河学院中青年学术骨干培养项目(2016GG0306);云南省科技厅项目(2016FB098)资助

摘　　要：以化学液相法制备的Al2O3包覆ZrO2/Y2O3复合粉体作为喷涂原料,利用等离子喷涂法制备了不同厚度的热障涂层。采用X射线衍射仪和扫描电子显微镜对涂层物相和显微结构进行了分析,并对其相结构稳定性、与基体结合强度、抗高温氧化性等性能进行了研究。结果表明：采用Al2O3包覆ZrO2/Y2O3复合粉体制备的热障涂层具有t相结构,涂层与基体之间具有较好的结合力,不同厚度涂层试样SEM形貌表面平整、光滑细致、晶界清晰、晶粒大小均匀,但气孔和裂纹随涂层厚度增大明显减少。经1 050℃氧化10 h处理后,涂层的氧化后质量增加速率随氧化时间的延长明显变缓,另外涂层的稳定性、高温抗氧化性能及隔热效果随着涂层厚度的增大而增强。Thermal barrier coatings with different thicknesses were prepared by a plasma spraying method with A1203 coated ZrO2/Y2O3 composite powder as a raw material. The phase composition and microstructure of coating were analyzed by X-ray diffraction and scanning electronic microscopy. The phase structural stability and the bonding strength as well as the high-temperature oxidation resistance were investigated. The results indicate that the thermal barrier coating is composed by stable t-zirconia phase and shows an intense bonding strength between the coating and the matrix. The coatings with different thicknesses present the similar morphological characteristics, such as the smooth surface, the clear grain boundary and the uniform grain size. However, the porosity and cracks decrease significantly with the increase of coating thickness. The oxidative weight rate of the coating increases slowly with the increase of the soaking time at 1 050 ℃ for 〉 10 h. Furthermore, the stability, high-temperature oxidation resistance and thermal insulation effect of the coating increase with the increase of coating thickness.

关 键 词：氧化铝 氧化锆 粉体 热障涂层 等离子喷涂 

分 类 号：TB323[一般工业技术—材料科学与工程]