Chemical degradation of SiC/SiC composite for the cladding of gas-cooled fast reactor in case of severe accident scenarios

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• 作者：L. Charpentier^a ; K. Dawi^a ; M. Balat-Pichelin^a ; ^{marianne.balat@promes.cnrs.fr} ; E. Bê ; che^a ; F. Audubert^b
• 关键词：A. Ceramic-matrix composites (CMC) ; B. SEM ; B. XPS ; B. Weight loss ; C. High-temperature corrosion ; C. Oxidation
• 刊名：Corrosion Science
• 出版年：2012
• 期刊代码：28_0010938x
• 类别：ch
• 出版时间：June, 2012
• 卷：59
• 期：Complete
• 页码：127-135
• 文件大小：1785 K

摘要

High temperature oxidation was performed on structural materials made of fibres of SiC in a SiC matrix (SiC/SiC) + 尾-SiC coating, considered for the cladding of the gas-cooled fast reactor. Tests carried out in various atmospheres (helium, nitrogen, air) coupled to mass variation, SEM and XPS analysis enabled the study of resistance to chemical degradation of such composites from 1400 to 2300 K. Monolithic 尾-SiC was also studied for comparison. The degradation of the composite material was faster than the monolithic one above 1970 K due to the damage of the 尾-SiC coating enabling the oxidizing species to penetrate inside the composite.