Effect of supercritical water applied to reactor on microstructure and flexural strength of ZrB₂-SiC-Graphite ceramic

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• 作者：Mingfu Wang^a ; ; Zhi Wang^b ; ^{wzdlut@dlut.edu.cn} ; ^{wangzhi1780@126.com} ; Ximiao Sun^b ; Xinghong Zhang^a ; Yueliang Jiang^c
• 关键词：A. Composites ; E. Corrosion ; F. Microstructure
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：August, 2012
• 卷：39
• 期：Complete
• 页码：162-167
• 文件大小：812 K

摘要

The ZrB₂-SiC-Graphite ceramic was immerged in the supercritical water for different times. The microcracks appeared on the surface of the specimen and the composition of the microcracks was confirmed by EDS analysis to be ZrO₂. The obvious corrosion of SiC and graphite flake on the surface of the specimen was not observed, which was attributed to the dissolution of the oxides of silicon and carbon (graphite) into the supercritical water. The corrosion of the specimen was accelerated as the pressure and temperature of the water increased. XPS analysis was carried out on the specimen corroded in water of 40 卤 1 MPa and 500 卤 10 掳C for 75 min, and the significant peak of B 1s was also measured, indicating the presence of the ZrB₂ phase on the surface of the specimen. For the specimen immerged in all conditions, the Vickers鈥?hardness did not reduce, the fracture toughness was improved and the minimal strength of the immerged specimen was still higher than 90%of the original strength of 480 MPa, which indicated that the ZrB₂-SiC-Graphite ceramic has excellent resistance to corrosion of the supercritical water applied to reactor.