黄威,马文,杨挺,杨曦,刘颖,白玉.溶液等离子喷涂铈酸镧热障涂层的制备及表征[J].稀有金属材料与工程,2020,49(2):561~566.[Huang Wei,Ma Wen,Yang Ting,Yang Xi,Liu Ying,Bai Yu.Preparation and characterization of solution precursor plasma sprayed La2Ce2O7 thermal barrier coating[J].Rare Metal Materials and Engineering,2020,49(2):561~566.]
溶液等离子喷涂铈酸镧热障涂层的制备及表征
投稿时间:2019-03-15  修订日期:2019-05-06
中文关键词:  铈酸镧  溶液前驱体等离子喷涂  热障涂层  田口实验
基金项目:国家自然科学基金资助(项目号51462026,51672136),内蒙古科技重大专项(2018-810)
中文摘要:
      铈酸镧(La2Ce2O7)是一种具有萤石结构的陶瓷材料,与8YSZ相比具有更低的热导率和较好的高温相稳定性,是一种新型热障涂层陶瓷材料。溶液前驱体等离子喷涂方法是近年来出现的一种制备纳米结构陶瓷热障涂层的新型涂层制备方法,制备的涂层具有独特的层间边界结构,有较低的热导率和较长的循环寿命。本文研究了La2Ce2O7涂层前驱体的热分解过程,采用溶液等离子喷涂方法制备了La2Ce2O7涂层。将摩尔浓度为3.08mol/L的硝酸盐溶液作为前驱体溶液,其粘度和表面张力分别为7.17 mPa.s和76.9 mN/m。采用STA-FTIR-QMS联用对La2Ce2O7干燥前驱体的分解过程进行了研究,确定了前驱体的分解温度及分解过程,从而确定了喷涂温度为450℃。通过田口实验确定了雾化压力1.2 bar、电流700 A、送液速率23 ml/min为最佳喷涂工艺参数,用此参数制备的La2Ce2O7涂层喷涂20遍厚度达到121μm,相对密度为92.4%,硬度为2.1 GPa。采用SEM、XRD、EDS、激光导热仪对制备的涂层进行了表征,结果表明得到了热导率较低、元素分布均匀、具有萤石结构的La2Ce2O7热障涂层。
Preparation and characterization of solution precursor plasma sprayed La2Ce2O7 thermal barrier coating
英文关键词:La2Ce2O7  solution precursor plasma spray  thermal barrier coatings  Taguchi experiments
英文摘要:
      La2Ce2O7 is a fluorite-structured ceramic material with lower thermal conductivity and better high-temperature phase stability than 8YSZ, thus, it is considered as a new thermal barrier coating ceramic material. The solution precursor plasma spraying (SPPS) method is a novel coating preparation method for preparing nanostructured ceramic thermal barrier coatings in recent years. The prepared SPPS coatings have an inter pass boundary (IPB) structure, with low thermal conductivity and long lifetime. In this paper, the decomposition processes of the La2Ce2O7 coating precursor were studied, and the La2Ce2O7 coating was prepared by SPPS method. The nitrate solution with a molar concentration of 3.08 mol/L was used as the precursor solution, and its viscosity and surface tension were 7.17 mPa.s and 76.9 mN/m, respectively. The decomposition process of the La2Ce2O7 dried precursor was characterized by STA-FTIR-QMS. The decomposition temperature and decomposition process of the precursor were evaluated, and the preheating temperature of substrate was determined to be 450 °C. The optimized spary parameters were the atomization pressure of 1.2 bar, the current of 700 A, and the liquid feed rate of 17 ml/min, determined by the Taguchi experiments. The La2Ce2O7 coating prepared by using the optimzed spray parameter had a thickness of 121.59 μm after 20 times spraying, relative density of 92.4%, and hardness of 2.1 GPa. The prepared coatings were characterized by SEM, XRD, EDS and laser flash method. The results showed that the La2Ce2O7 thermal barrier coating with low thermal conductivity, uniform element distribution and fluorite structure is obtained.
作者单位E-mail
黄威 内蒙古工业大学材料学院 952221041@qq.com 
马文 内蒙古工业大学材料学院 wma@imut.edu.cn 
杨挺 内蒙古工业大学材料学院  
杨曦 内蒙古工业大学材料学院  
刘颖 内蒙古工业大学材料学院  
白玉 内蒙古工业大学材料学院  
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