| 摘要: |
| 以锆盐和钇盐水溶液为原料，采用溶液前驱体等离子喷涂(SPPS)技术制备了氧化钇部分稳定氧化锆(7YSZ)热障涂层，利用X射线衍射仪(XRD)、拉曼光谱(Raman)和扫描电镜(SEM)研究了SPPS涂层在1 200~1 400 ℃下的相结构和微观结构稳定性。结果表明：沉积态SPPS涂层为亚稳四方相(t′)，在1 200 ℃和1 300 ℃时未发生亚稳四方相(t′)向单斜相(m)的转变，在1 400 ℃热处理100 h后出现了少量单斜相。在1 200~1 400 ℃下，SPPS涂层发生了不同程度的烧结现象；随热处理温度升高，SPPS涂层晶粒长大速率增加，在1 200、1 300和1 400 ℃热处理 100 h后，最大晶粒尺寸分别约为350、700和1 100 nm。同时，在1 400 ℃下热处理100 h后，涂层中仍然存在大量1 μm的微孔，表明其具有较好的微孔保持能力。 |
| 关键词: 溶液前驱体 等离子喷涂 热障涂层 微观结构 |
| DOI：10.11933/j.issn.1007-9289.2015.03.004 |
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| 基金项目: |
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| Thermal Stability of Thermal Barrier Coatings Prepared by Solution Precursor Plasma Spraying |
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WANG Ruijun, WANG Shixing, BAO Manyu, LI Hong, WANG Weiping1,2,3
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1. Beijing Golden Wheel Special Machine Co., Ltd., Beijing 100083;2. Institute of Surface Engineering Technology, Chinese Academy of Agriculture Mechanization Sciences, Beijing 100083;3. Air Force Representative Office Stationed at Beijing, Beijing 100061
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| Abstract: |
| Thermal barrier coatings were produced by solution precursor plasma spraying(SPPS) that used aqueous solution of zirconium and yttrium salt as raw materials. Thermal stability of the phase and the microstructure of SPPS coatings at 1 2001 400 ℃ were characterized by XRD, Raman and SEM. The results show that assprayed SPPS coatings are composed of metastable tetragonal (t′). The phase transition of metastable tetragonal to monoclinic does not occur at 1 200 ℃ and 1 300 ℃. Some monoclinic phase appears in SPPS coatings after heat treatment at 1 400 ℃ for 100 h. SPPS coatings are sintered after heat treatment at 1 2001 400 ℃. Growth rate of the grain size of SPPS coatings increases with the increase of the treatment temperature. The maximal grain size are 350, 700 and 1 100 nm after exposure for 100 h at 1 200, 1 300 and 1 400 ℃, respectively. Many micro pores with diameters of about 1 μm are retained after exposure for 100 h at 1 400 ℃. It means that the SPPS coatings have the ability to reserve micro pore at high temperature. |
| Key words: solution precursor plasma spray thermal barrier coatings microstructure |
