中国激光, 2019, 46 (8): 0802004, 网络出版: 2019-08-13  

激光熔注制备ZrO2p热障涂层过程中ZrO2 颗粒的组织演变 下载: 890次

Microstructure Evolution of ZrO2 Particle During Manufacture of ZrO2pThermal Barrier Coating by Laser Melt Injection
作者单位
华中科技大学材料科学与工程学院, 湖北 武汉 430074
摘要
采用激光熔注技术在Ti-6Al-4V表面制备了ZrO2p热障涂层,利用X-射线衍射、电子背散射衍射及扫描电镜技术,研究了激光熔注过程中ZrO2颗粒的组织演变规律。结果表明:通过原子固态扩散,团聚态ZrO2颗粒内的微粒尺寸增大,并由球状变为多面体状;激光熔注后,ZrO2颗粒中未发现单斜相(m-ZrO2);35%的稳定四方相(t'-ZrO2)转变为立方相(c-ZrO2);内应力降低,导致90%的正交相(o-ZrO2)转变为c-ZrO2。单个微粒内同时存在块状和纳米颗粒状t'-ZrO2和c-ZrO2,残留的o-ZrO2集中分布于微粒界面。ZrO2的组织演变使得微粒间的结合强度降低,促使ZrO2大颗粒离散成细小颗粒,提高了涂层的防热性能。
Abstract
The ZrO2p/Ti-6Al-4V metal matrix composites layer, which is a novel and promising thermal barrier coating, is produced in this study by the laser melt injection (LMI) process. The microstructure evolution of the ZrO2 particle during the LMI process is studied via X-ray diffraction, electron backscattered diffraction, and scanning electron microscopy. The results show that through solid-state diffusion, the size of sub-particle in the agglomerated ZrO2 particle increases, and the morphology transforms from spherical to polyhedral. Few monoclinic ZrO2 (m-ZrO2) is found in the ZrO2 particle after the LMI. Moreover, 35% of the metastable tetragonal ZrO2 (t'-ZrO2) transforms into cubic ZrO2 (c-ZrO2). The internal stress decreases, resulting in 90% of orthorhombic (o-ZrO2) transforming into c-ZrO2. The single sub-particle comprises both t'-ZrO2 and c-ZrO2. The residual o-ZrO2 is distributed in the sub-particle boundary. The microstructure evolution of ZrO2 results in a decrease in the strength of the bonds among the sub-particles, which promotes the ZrO2 particle disintegration and improves the thermal resistance of the coating.

林守钢, 郭溪溪, 陈浩, 张航, 赖境, 刘德健. 激光熔注制备ZrO2p热障涂层过程中ZrO2 颗粒的组织演变[J]. 中国激光, 2019, 46(8): 0802004. Shougang Lin, Xixi Guo, Hao Chen, Hang Zhang, Jing Lai, Dejian Liu. Microstructure Evolution of ZrO2 Particle During Manufacture of ZrO2pThermal Barrier Coating by Laser Melt Injection[J]. Chinese Journal of Lasers, 2019, 46(8): 0802004.

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