| 摘要: |
| 以纳米团聚烧结的ZrO27%Y2O3(7YSZ)粉末为原料，采用等离子喷涂物理气相沉积(PSPVD)工艺及大气等离子喷涂工艺(APS)在镍基高温合金表面制备了柱状热障涂层(CTBC)和层状热障涂层(LTBC)，并进行1 000 ℃的恒温氧化试验，采用X射线衍射仪、扫描电镜、电子探针、能谱分析等检测手段表征热障涂层的微观结构和高温氧化行为。结果表明:CTBC涂层在氧化初始阶段快速生成TGO层，氧化50 h后TGO层生长速率减慢，氧化动力学曲线符合五次方抛物线规律，而LTBC涂层氧化动力学曲线符合常规二次方抛物线规律。CTBC涂层氧化速度快于LTBC涂层，但抗氧化剥落性能优于LTBC涂层。 |
| 关键词: 等离子喷涂物理气相沉积 柱状晶YSZ 高温氧化 失效机制 |
| DOI：10.11933/j.issn.1007-9289.2015.05.008 |
| 分类号: |
| 基金项目: |
|
| High Temperature Oxidation Behavior of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition |
|
CHEN Wenlong, LIU Min, ZHANG Jifu, SONG Jinbing, DENG Ziqian1,2
|
|
1.School of Materials and Energy, Guangdong University of Technology;2a. Institute of New Materials, 2b. National Engineering Laboratory for Modern Materials Surface Engineering Technology, 2c. Guangdong Provincial Key Laboratory for Modern Materials Surface Engineering Technology, Guangzhou Research Institute of Nonferrous Metals
|
| Abstract: |
| Using nanoagglomerated and sintered ZrO27%Y2O3 (7YSZ) powders as raw materials, columnar crystal thermal barrier coatings (CTBCs) were prepared by plasma sprayphysical vapor deposition (PSPVD) at Nibased superalloys, and layered thermal barrier coatings (LTBCs) were prepared by atmospheric plasma spraying (APS) for comarision. The constant temperature oxidization test of the two thermal barrier coating systems was also performed at 1000 ℃. The microstructure, high temperature oxidation behavior and oxidation failure mechanisms of the thermal barrier coatings were investigated using the Xray diffraction(XRD) , scanning electron microscope (SEM), electron probe microanalysis (EPMA) and energy dispersive spectroscopy (EDS). The results indicate that a TGO layer generates quickly on the CTBC at the beginning of the oxidation, and the growth rate of the TGO layer slows down after oxidation for 50 h. The oxidation kinetics of the CTBCs can be properly expressed by the quintic power function formula, however, the LTBC oxidation kinetics curves accord with conventional quadratic parabola law. The CTBC is oxided faster than the LTBC, however, the antioxidant peeling performance is better than that of LTBC. |
| Key words: plasma sprayphysical vapor deposition（PSPVD） columnar YSZ high temperature oxidation failure mechanism |
