大气和低压等离子喷涂ZrO_2-8%Y_2O_3涂层及性能研究

Effect of Plasma Spraying Methods and the Morphology of Powder on the Microstructure of ZrO_2-8%Y_2O_3 Coating

本研究采用大气等离子(APS)和低压等离子喷涂(LPPS)两种方法分别对成分为ZrO2-8%Y2O3的微粉球形造粒-烧结粉末(Spherical Spray Dried Sintered:SSS)和微粉粘接-破碎粉末(Mucilage Adhered Crushed:MAC)进行了喷涂实验。使用金相显微镜,X-Ray及维氏硬度仪等,分析了涂层的微观组织,相结构及硬度。结果表明,APS喷涂SSS粉末制备的涂层为多孔结构,气孔率高于20%,LPPS喷涂SSS粉末制备的涂层呈现纵向生长趋势。而对于MAC粉末,两种方法制备的涂层孔隙率明显低于SSS粉末制备的涂层,其中LPPS喷涂MAC粉末制备涂层的致密性和硬度更高。两种方法喷涂SSS粉末,涂层相组成与粉末相同,粉末与涂层中只含有T相,而APS和LPPS喷涂MAC粉末,涂层中出现了m相。

Atmospheric plasma spraying （APS） and low-pressure plasma spraying （LPPS） were adopted to deposit ZrO2-8%Y2O3 coatings using two types of powders with different morphologies, namely, Spherical Spray Dried Sintered （SSS） and Mucilage Adhered Crushed （MAC）, to form different microstructural coatings for thermal barrier coatings （TBCs） and solid oxide fuel cell （SOFC） applications, respectively. Microscope, X-ray diffraction and hardness test methods were used to investigate the coatings. The results indicated that the coating has a high porosity of up to 20% for SSS powder prepared by APS and LPPS. For the MAC powder, however, the coatings prepared by APS and LPPS had lower porosity and high hardness values. Furthermore, a monoclinic phase was present in the as-sprayed coatings that were not present in the original powder.