摘要
以Yb2O3、Y2O3、Gd2O3稀土氧化物粉末和ZrOCl2.8H2O粉末为原料,采用化学共沉淀法制备了Yb2O3-Y2O3-Gd2O3-ZrO2(YYGZO)热喷涂用粉末,采用大气等离子喷涂技术制备了YYGZO涂层,利用场发射扫描电镜(FESEM)、X射线衍射(XRD)研究了YYGZO粉末及涂层的微观组织形貌、相结构。结果表明,制备的热喷涂YYGZO粉末大部分呈规则实心球体状,且球形度良好,颗粒粒径均匀,大部分颗粒粒径分布为30～60μm,流动性能较好,满足大气等离子喷涂的要求。YYGZO涂层具有较好的高温相结构稳定性。所制备YYGZO热障涂层组织结构比较致密,涂层各个界面结合紧密,孔隙率约为9.23%,结合强度为35.2 MPa。
Yb2O3-Y2O3-Gd2O3-ZrO2 (YYGZO) composition powder was synthesized by the chemical coprecipitation method using Yb2O3,Y2O3,Gd2O3 and ZrOCl2 .8H2O powders as raw materials,and applied as ceramic topcoats of thermal barrier coating (TBC) by atmospheric plasma spraying (APS).Microstructure and phases of YYGZO powder and thermal barrier coatings were examined by scanning electrical microscopy (FESEM) and X-ray diffraction (XRD).The results showed that the YYGZO ceramics powder were prepared with solid sphere shape and proper distribution of particle size about 3060 μm by spray-dried method are suitable for atmospheric plasma spraying. Phase analyses revealed that YYGZO coatings keep the single phase before and after under heat treatment at 1200 ℃ . The coating has compact microstructure and higher binging strength between the topcoat and bondcoat. The bingding strength and porosity of the coating are about 35. 2 MPa and 9. 23% ,respectively.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第6期1213-1216,共4页
Journal of Synthetic Crystals
关键词
大气等离子喷涂
热障涂层
涂层性能
微观组织
atmospheric plasma spraying
thermal barrier coatings
coating properties
microstructure
