宫雪,刘海洋,刘赛月,张晓东,王铀.等离子喷涂用纳米结构Gd2Zr2O7 喂料的制备与性能[J].表面技术,2022,51(10):353-360.
GONG Xue,LIU Hai-yang,LIU Sai-yue,ZHANG Xiao-dong,WANG You.Preparation and Characterization of Nanostructured Gd2Zr2O7 Feedstock for Plasma Spraying[J].Surface Technology,2022,51(10):353-360
等离子喷涂用纳米结构Gd2Zr2O7 喂料的制备与性能
Preparation and Characterization of Nanostructured Gd2Zr2O7 Feedstock for Plasma Spraying
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.10.038
中文关键词:  纳米结构  等离子喷涂  稀土锆酸盐  环境障涂层  热障涂层
英文关键词:nanostructure  plasma spraying  rare earth zirconate  EBC  TBC
基金项目:国家科技重大专项项目(2017-Vl-0020-0093);国家自然科学基金青年基金项目(52001217);辽宁省博士科研启动基金计划项目(2021-BS-195);沈阳航空航天大学航空制造工艺数字化国防重点学科实验室开放基金(SHSYS 202005)
作者单位
宫雪 沈阳航空航天大学 航空宇航学院,沈阳 110136 
刘海洋 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001 
刘赛月 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001 
张晓东 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001 
王铀 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001 
AuthorInstitution
GONG Xue College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China 
LIU Hai-yang Department of Materials Science, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 
LIU Sai-yue Department of Materials Science, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 
ZHANG Xiao-dong Department of Materials Science, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 
WANG You Department of Materials Science, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 
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中文摘要:
      目的 稀土锆酸盐具有低热导率、优异的抗烧结性能和相稳定性,是下一代热障涂层和环境障涂层的理想材料。通过纳米粉体再造粒技术制备出等离子喷涂用高性能纳米结构球形喂料Gd2Zr2O7,以满足下一代热障涂层和环境障涂层的需求。方法 以Gd2O3与ZrO2粉体为原材料,采用纳米粉体再造粒技术制备出可等离子喷涂用的纳米结构Gd2Zr2O7喂料。利用SEM、XRD研究了固相烧结温度和时间对Gd2Zr2O7含量和晶粒尺寸的影响,分析了纳米结构Gd2Zr2O7喂料在不同纳米粉体再造粒阶段的微观形貌和相组成。同时,测定了纳米结构Gd2Zr2O7喂料的流动性、松装密度和振实密度。结果 纳米粉体再造粒技术可以制备出等离子喷涂用纳米结构Gd2Zr2O7喂料,喂料内部结构致密,球形度好,粒径为10~50 μm。在纳米粉体再造粒过程中,晶粒尺寸会随着烧结温度的升高而增大。在1 300 ℃烧结2 h生成的Gd2Zr2O7含量高,且晶粒尺寸小,为最优固相烧结工艺。等离子球化处理能有效地改善喂料的流动性。等离子球化处理后的喂料松装密度为2.09 g/cm3,振实密度为3.26 g/cm3,流动性为22.3 s/(50 g)。结论 采用纳米粉体再造粒技术成功制备出纳米结构Gd2Zr2O7粉体喂料。该喂料颗粒内部结构致密,外部表面光滑,球形度好,适合等离子喷涂,有望成为下一代热障涂层和环境障涂层。
英文摘要:
      It is an advanced surface modification technology to prepared environmental barrier coating (EBC) by plasma spraying, which can improve the corrosion resistance of SiCf/SiC composite materials. However, the corrosion resistance of Calcium-Magnesiu-Alumino-Silicate (CMAS) for the EBC coating was not well solved at present. Rare earth zirconates are ideal materials for next generation thermal barrier coatings and environmental barrier coatings because of their low thermal conductivity, excellent sinterability and phase stability. This work aims to prepare high-performance nanostructured Gd2Zr2O7 feedstocks with nanopowder regranulation technology to meet the needs of the next generation of thermal and environmental barrier coatings.The Gd2O3 and ZrO2 with the average particle size of 50 nm were used to prepare the Gd2Zr2O7 feedstocks. In order to make full use of nano effect, the nanoparticles must be reconstituted to the agglomerates by nanopowder regranulation technology. Nanopowder regranulation technology includes ball milling, spray drying, sintering and plasma treatment. The slurries which composed of 298 g Gd2O3, 202 g ZrO2, 1 000 g deionized water and 2.5 g PVA were ball milled for 24 h. The prepared slurries were spray dried in a YC-018 spraying dryer to obtain the agglomerates and then sintered. The agglomerates were sintered in the heat treatment furnace at 1 200 ℃, 1 300 ℃, 1 400 ℃, 1 500 ℃ for 2 h, 4 h, and 6 h, respectively. In order to improve the density and mobility of the feedstocks, the agglomerates were plasma treated by Mecto 9MC spraying system. The plasma flame caused the agglomerates surface to melt rapidly and form droplets, which are then rinsed into deionized water to cool quickly and form spherical solid particles. Plasma treatment slurries were dried in a 120 ℃ dryer and screened through a 150-mesh sieve to obtain Gd2Zr2O7 feedstocks. The microstructure, morphology, and chemical composition of the feedstocks were observed by a Quanta 200FEG scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). The phases of the feedstocks were identified by X-ray diffraction analysis (XRD) with Cu Kα radiation.The results show that the nanostructure Gd2Zr2O7 feedstocks can be prepared by nanopowder regranulation technology. The feedstocks have the dense structure and good sphericity. The particle size of feedstocks is 10~50 μm. In the process of nanopowder regranulation technology, the grain size increases with the increase of sintering temperature. The optimal sintering parameters for Gd2Zr2O7 feedstocks are sintered at 1 300 ℃ for 2 hours. Compared with the other sintering parameters, the content of Gd2Zr2O7 after sintering at 1 300 ℃ for 2 hours is highest and the grain size is smallest. Plasma treatment can improve the flowability of feedstocks effectively. After plasma treatment, the apparent density is 2.09 g/cm3, the tap density is 3.26 g/cm3, and the flowability is 22.3 s/(50 g). The hausner ratio is 1.19 which indicated the feedstocks is in a free flow state. The Gd2Zr2O7 feedstocks show good flowability.Nanostructured Gd2Zr2O7 powder feedstocks are successfully prepared by the nanopowder regranulation technology. The feedstocks have dense internal structure, smooth external surface and good spherical shape. It is suitable for plasma spraying and expected to become the next generation of TBC and EBC.
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