High temperature corrosion of carbon/carbon composites in Zr–Ti melts during liquid metal infiltration. (September 2015)

• Record Type: Journal Article
• Authors: Zeng, Yi; Xiong, Xiang; Wang, Dini; Wu, Liang; Chen, Zhaoke; Sun, Wei; Wang, Yalei; Xiao, Ping
• Is Part Of: Corrosion science. Volume 98(2015)
• Page Start: 98
• Page End: 106
• Publication Date: 2015-09
• Subjects: A. Ceramic matrix composites -- B. SEM -- C. High temperature corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.05.014
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Internal carbon matrix was not corroded by melts due to the protective pyrocarbon. Release of thermal stress produced defects and caused the loss of strength of sample. The flexural strength can be improved by new deposition of pyrocarbon in defects. Abstract: The carbon/carbon composites with Zr–Ti–C were prepared by liquid metal infiltration (LMI) process. The chemical corrosion and thermal stress damage of carbon matrices in Zr–Ti melts were investigated. A corrosion mechanism and a method of rehabilitating defective materials were proposed. The results indicated that the internal carbon matrices of composites were not corroded by the Zr–Ti melts and their vapours. However, the superficial matrices contacting the melts were severely consumed. In addition, the release of thermal stress produced the defects. The flexural strength of the samples after LMI could be improved via a new deposition of pyrocarbon in the defects.