Effect of Heat Exposure on the Microstructures and Mechanical Properties of 3Al2O3·2SiO2/Si/SiC Coating System
Effect of Heat Exposure on the Microstructures and Mechanical Properties of 3Al2O3·2SiO2/Si/SiC Coating System
复制标题
热暴露对3Al2O3·2SiO2/Si/SiC涂层体系微观结构和力学性能的影响
DOI：
10.1002/9781119407270.ch41
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Kakisawa
中科院分区：
文献类型：
--
作者：
R. Inoue;K. Chikamoto;Y. Kogo;H. Kakisawa
本章讨论了如何通过大气等离子喷涂工艺制备3Al2O3.2SiO2/Si/SiC环境屏障涂层（EBC）系统。研究了在1300 ℃热暴露1、50和100 h后的显微组织特征和力学性能。沉积态和热暴露的莫来石EBC层的杨氏模量和硬度分别为98 GPa和100 GPa。这些物理性能增加热暴露后，因为莫来石在加热过程中结晶。采用APS工艺成功制备了莫来石/Si/SiC模型EBC体系。EBC层中的无定形莫来石在加热过程中结晶，导致成核微裂纹。EBC层的初始杨氏模量小于结晶莫来石EBC层。热暴露后，SiO2相析出，SiO2周围莫来石层的杨氏模量变得小于孤立区域。
This chapter discusses how a 3Al2O3.2SiO2/Si/SiC environmental barrier coating (EBC) system was fabricated by the atmospheric plasma spray process. Microstructural characteristics and mechanical properties after heat exposure at 1300Υ for 1, 50, and 100 h were investigated. The Young's modulus and hardness of as‐deposited and heat‐exposed mullite EBC layer were 98 GPa and 100 GPa, respectively. These physical properties increased after heat exposure because mullite crystallizes during heating. The mullite/Si/SiC model EBC system was successfully fabricated by the APS process. The amorphous mullite contained in the EBC layer crystallizes during heating, leading to nucleate micro cracks. The initial Young's modulus of the EBC layer is smaller than the crystallized mullite EBC layer. After heat exposure, the SiO2phase precipitates and the Young's modulus of the mullite layer around SiO2becomes smaller than that of the isolated region.