大气等离子体喷涂Sm_2Zr_2O_7涂层的结构和性能  

Microstructure and Properties of Air Plasma Sprayed Sm_2Zr_2O_7 Coatings

作　　者：于建华[1,2] 赵华玉[1,2] 周霞明[1,2] 陶顺衍[1,2] 丁传贤[1,2] 

机构地区：[1]中国科学院特种无机涂层重点实验室,上海200050 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2011年第7期696-700,共5页Journal of Inorganic Materials

摘　　要：稀土锆酸盐材料具有比Y2O3部分稳定ZrO2陶瓷低的热导率,是新型热障涂层的潜在候选材料之一.利用大气等离子体喷涂技术以喷雾造粒的Sm2Zr2O7粉体制备涂层,并在相同条件下沉积8wt%Y2O3稳定ZrO2涂层.对比评价了两种涂层的结构、热物理性能和力学性能.X射线衍射结果表明,制备态Sm2Zr2O7涂层为缺陷萤石结构.扫描电镜分析显示,Sm2Zr2O7和8wt%Y2O3稳定ZrO2涂层为典型的层状结构,内部有很多气孔、裂纹等缺陷.800℃测得的Sm2Zr2O7涂层的热导率为0.44 W/（m.K）,比相同条件下测得的8wt%Y2O3稳定ZrO2涂层的热导率低~40%,两者的热膨胀系数相似.力学测试结果显示,Sm2Zr2O7涂层的抗折强度、硬度和弹性模量均低于8wt%Y2O3稳定ZrO2涂层.Rare-earth zirconates with a pyrochlore structure have attracted great attention for potential application in thermal barrier coating systems.In the present work,Sm2Zr2O7 coatings were deposited by atmospheric plasma spraying technology.Their microstructure,thermo-physical and mechanical properties were examined,and com-pared with that of 8wt% Y2O3 stabilized ZrO2 coatings which was deposited under the same plasma spraying condi-tions.X-ray diffraction result shows that the as-sprayed Sm2Zr2O7 coating exhibits a defective fluorite structure.The thermal conductivity of Sm2Zr2O7 coating measured at 800℃ is 0.44W/（m.K）,about 40% lower than that of 8wt% Y2O3 stabilized ZrO2 coating,but the expansion coefficients of both coatings are similar.The Sm2Zr2O7 coat-ing exhibits lower bending strength,microhardness and elastic modulus compared with 8wt% Y2O3 stabilized ZrO2 coating.

关 键 词：等离子体喷涂 Sm2Zr2O7涂层 热导率 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]