Oxidation and microstructure of SiC f /SiC composites in moist air up to 1600°C by X‐ray tomographic characterization
- School of Materials Science and Engineering Central South University Changsha Hunan China, Hunan Province Key Laboratory of New Specialty Fibers and Composite Material Central South University Changsha Hunan China
- Key Laboratory of Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University Chengdu Sichuan PR China
- Science and Technology on Aerospace Chemical Power Laboratory Hubei Institute of Aerospace Chemotechnology Xiangyang Hubei PR China
- Hunan Province Key Laboratory of New Specialty Fibers and Composite Material Central South University Changsha Hunan China
- Hunan Province Key Laboratory of New Specialty Fibers and Composite Material Central South University Changsha Hunan China, State Key Laboratory of High Performance Complex Manufacturing Central South University Changsha Hunan China
Abstract SiC f /SiC composites that possess PyC or BN interface layers were fabricated and then oxidized in moist air at 1000, 1200, 1400, and 1600°C. High‐resolution CT was used for capturing 3D images and quantifying the SiC phase, mesophase, and voids. The oxidation behavior and microstructural evolution of SiC f /SiC with PyC or BN interface are discussed in this study. The microstructure of the SiC f /SiC with a PyC layer was seriously damaged in moist air at high temperature, whereas the BN interface layer enhanced the oxidation resistance of the SiC f /SiC. These results are also confirmed by using XRD, oxidation mass gain, tensile testing, and SEM measurements. The results of the oxidation behavior and microstructural evolution for SiC f /SiC oxidized in dry air are also compared with the results of this study. Comparing the SiC f /SiC with a PyC interface layer, the composite with a BN interface layer oxidized in moist air exhibits a high void growth rate and a low SiO 2 grain growth rate from 1000 to 1600°C. This work will provide guidance for predicting the service life of SiC f /SiC for multiscale damage rate models of materials at a local scale and will also provide guidance on the life service design of SiC f /SiC materials.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1581195
- Journal Information:
- International Journal of Applied Ceramic Technology, Journal Name: International Journal of Applied Ceramic Technology Journal Issue: 3 Vol. 17; ISSN 1546-542X
- Publisher:
- Wiley-BlackwellCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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