等离子喷涂LaTi2Al9O19热障涂层的微观组织结构及热物理性能

doi:10.7527/S1000-6893.2013.0244

材料工程与机械制造

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等离子喷涂LaTi₂Al₉O₁₉热障涂层的微观组织结构及热物理性能

郝维维¹, 郑蕾^1,2, 郭洪波^1,2, 宫声凯^1,2, 徐惠彬^1,2

1. 北京航空航天大学材料科学与工程学院, 北京 100191;
2. 北京航空航天大学特种功能材料与薄膜技术北京市重点实验室, 北京 100191

收稿日期:2012-07-25 修回日期:2012-09-18 出版日期:2013-06-25 发布日期:2012-09-25
通讯作者: 郑蕾, Tel.: 010-82317117 E-mail: zhenglei@buaa.edu.cn E-mail:zhenglei@buaa.edu.cn
作者简介:郝维维女, 硕士研究生。主要研究方向: 热障涂层。 Tel: 010-82317117 E-mail: haowei11@yahoo.com.cn;郑蕾女, 博士, 助理研究员。主要研究方向: 功能材料。 Tel: 010-82317117 E-mail: Zhenglei@buaa.edu.cn;郭洪波男, 博士, 教授, 博士生导师。主要研究方向: 高性能发动机热防护涂层; 薄膜科学与技术; 电子束/离子束表面改性。 Tel: 010-82317117 E-mail: guo.hongbo@buaa.edu.cn;宫声凯男, 博士, 教授, 博士生导师。主要研究方向: 先进热障涂层材料技术, 先进轻质高温结构金属间化合物材料。 Tel: 010-82339003 E-mail: gongsk@buaa.edu.cn;徐惠彬男, 博士, 教授, 博士生导师, 中国工程院院士。主要研究方向: 新型形状记忆合金、热障涂层和磁致伸缩材料等特种功能材料。 Tel: 010-82338173 E-mail: xuhb＠buaa.edu.cn
基金资助:
国家自然科学基金(51071013);国家重点基础研究发展计划(2010CB631200,2012CB625100)

Microstructure and Thermo-physical Properties of Plasma Sprayed LaTi₂Al₉O₁₉ Thermal Barrier Coatings

HAO Weiwei¹, ZHENG Lei^1,2, GUO Hongbo^1,2, GONG Shengkai^1,2, XU Huibin^1,2

1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
2. Beijing Key Laboratory for Advanced Functional Materials and Thin Film Technology, Beihang University, Beijing 100191, China

Received:2012-07-25 Revised:2012-09-18 Online:2013-06-25 Published:2012-09-25
Contact: 10.7527/S1000-6893.2013.0244 E-mail:zhenglei@buaa.edu.cn
Supported by:
National Natural Science Foundation of China (51071013); National Basic Research Program of China(2010CB631200, 2012CB625100)

摘要/Abstract

摘要：

第一代热障涂层(TBCs)由氧化钇部分稳定的氧化锆(YSZ)陶瓷隔热层和金属粘结层组成,该涂层长期使用温度低于1 200℃。随着先进航空发动机向着高推重比发展,迫切要求发展新一代超高温、高隔热热障涂层材料。LaTi₂Al₉O₁₉(LTA)在1 500℃长期保持相稳定,是一种非常有前景的超高温热障涂层候选材料。本文采用大气等离子喷涂(APS)制备了LTA涂层,研究了喷涂工艺对涂层微观组织结构和热物理性能的影响。结果表明沉积态涂层中含少量的非晶态,在860℃和1 130℃出现晶化峰。等离子喷涂过程中La₂O₃挥发量较多,导致沉积态涂层中La元素与原始粉末相比含量偏低,而其他组分的化学成分随喷涂功率变化不大。LTA涂层的热扩散系数在1 400℃下为0.3~0.4 mm²·s^-1,热导率为1.1~1.6 W·m^-1·K^-1。1 050℃经过20小时热处理后,得到晶化的涂层在晶化温度范围内的热扩散系数和热导率值均增大。随着喷涂功率减小,涂层孔隙率增加,热导率减小。

关键词: 热障涂层, 陶瓷, LaTi₂Al₉O₁₉, 等离子喷涂, 热导率

Abstract:

Conventional thermal barrier coatings (TBCs) consisting of a yttria stabilized zirconia (YSZ) ceramic coat and a metallic bond coat for industrial application cannot work long above 1 200℃. With aero-engines developing towards higher thrust-to-weight ratio, it is necessary to develop new ceramic coating materials with better thermal barrier performance for ultra-high temperature application. LaTi₂Al₉O₁₉ (LTA) was proposed as a promising candidate due to its excellent phase stability at temperatures above 1 500℃. In this paper, the LTA coatings were produced by atmospheric plasma spraying (APS) and their microstructures and thermo-physical properties were investigated. There were some amorphous phases in the as-sprayed coatings and crystallization of the coatings occurred at 860℃ and 1 130℃, respectively. Due to the volatilization of La₂O₃during spraying, the concentration of La in the sprayed coating was relatively lower than that in the powder, while the other elements didn't show apparent changes in the compositions. The thermal diffusivity of the LTA coatings ranged from 0.3 to 0.4 mm²·s^-1 at 1 400℃ and the corresponding thermal conductivity were in the range of 1.1 to 1.6 W·m^-1·K^-1. The coating porosity increased as the spraying power decreased, while the thermal conductivity decreased with increasing spraying power.

Key words: thermal barrier coatings, ceramic, LaTi₂Al₉O₁₉, plasma spraying, thermal conductivity

中图分类号:

V261.93

郝维维, 郑蕾, 郭洪波, 宫声凯, 徐惠彬. 等离子喷涂LaTi₂Al₉O₁₉热障涂层的微观组织结构及热物理性能[J]. 航空学报, 2013, 34(6): 1485-1492.

HAO Weiwei, ZHENG Lei, GUO Hongbo, GONG Shengkai, XU Huibin. Microstructure and Thermo-physical Properties of Plasma Sprayed LaTi₂Al₉O₁₉ Thermal Barrier Coatings[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(6): 1485-1492.

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等离子喷涂LaTi₂Al₉O₁₉热障涂层的微观组织结构及热物理性能

Microstructure and Thermo-physical Properties of Plasma Sprayed LaTi₂Al₉O₁₉ Thermal Barrier Coatings

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