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李英杰,马文,黄威,杨曦,刘颖,陈伟东,白玉.等离子喷涂Gd2Zr2O7-SrZrO3复合陶瓷涂层组织结构和性能的研究[J].稀有金属材料与工程(英文),2020,49(2):555~560.[Li Ying-jie,Ma wen,Huang Wei,Yang Xi,Liu Ying,Chen Wei-dong and Bai Yu.Study on Microstructure and Properties of Plasma Sprayed Gd2Zr2O7-SrZrO3 Composite Ceramic Coatings[J].Rare Metal Materials and Engineering,2020,49(2):555~560.]
Study on Microstructure and Properties of Plasma Sprayed Gd2Zr2O7-SrZrO3 Composite Ceramic Coatings
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Received:March 15, 2019  Revised:May 06, 2019
DOI:
Key words: plasma spraying  thermal barrier coating  thermal conductivity  thermal expansion coefficient
Foundation item:国家自然科学基金资助(51462026, 51672236),内蒙古科技重大专项(2018-810)
Author NameAffiliation
Li Ying-jie,Ma wen,Huang Wei,Yang Xi,Liu Ying,Chen Wei-dong and Bai Yu  
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Abstract:
      Gd2Zr2O7-SrZrO3 (GZSZ, Gd2Zr2O7:SrZrO3=7:3) composite ceramic powder was synthesized by solid state reaction. Spray drying and atmospheric plasma spray (APS) method were used to prepare corresponding spray powders and coatings, respectively. The phase compositions and microstructures of the spray dried powders and APS coatings were characterized by X-ray diffraction and scanning electron microscopy. The thermal diffusivity, thermal expansion coefficient and sintering coefficient of the coatings were characterized by a laser flash method and a high-temperature dilatometer. Both GZSZ composite powders and coatings are composed of Gd2Zr2O7 and SrZrO3. The Gd2Zr2O7 powder has a pyrochlore structure, while the Gd2Zr2O7 coating has a fluorite structure. And both the SrZrO3 powders and coatings have a perovskite structure. The porosity of the coating is ~14%, and its thermal expansion coefficient after heat treatment at 1400℃ for 5 h is 9.8~11.2×10-6 K-1. The thermal conductivity of the as-sprayed GZSZ coating is ~0.8 W?m-1?K-1, which is ~20% lower than that of the SrZrO3 coating (~1.0 W?m-1?K-1). And the thermal conductivity of the GZSZ coating increases to ~1.5 W?m-1?K-1 after heat treatment at 1400℃ for 360 h. The results showed that the GZSZ coating is a promising thermal barrier coating material.