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Degradation mechanisms of a self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite at high temperature under different oxidizing atmospheres

Luan, Xin’gang and Zou, Yun and Hai, Xiaohu and Bai, Hui and Zhang, Qing and Riedel, Ralf and Cheng, Laifei (2018):
Degradation mechanisms of a self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite at high temperature under different oxidizing atmospheres.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3804-3813, 38, (11), ISSN 09552219,
DOI: 10.1016/j.jeurceramsoc.2018.05.001,
[Online-Edition: https://doi.org/10.1016/j.jeurceramsoc.2018.05.001],
[Article]

Abstract

Chemical vapor-infiltrated self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite specimens were exposed at 1300 °C for 300 h at atmospheric pressure under two different oxidizing atmospheres (i.e., wet (12%H2O:8%O2:80%Ar) and dry (0.01%O2:99.99%Ar)) representative of rich and poor oxidizing conditions, respectively. Mechanical testing, microstructural observations, and element analyses were performed on the treated specimens. The flexural strength retentions of the specimens were 47.9 and 39.4% under wet and dry oxygen conditions, respectively. The SiC and B4C matrices were severely oxidized under wet oxygen conditions, whereas the BN interphase remained intact. The BN interphase and the B4C layered phase were both partially oxidized under dry oxygen conditions. Thus, the SiC(f)/BN(i)/[SiC-B4C](m) composites exhibited improved oxidation resistance under wet oxygen atmospheres as compared to dry oxygen conditions as a result of the formation of borosilicate glasses. In addition, two different degradation mechanisms for the composites during the oxidation process were discussed.

Item Type: Article
Erschienen: 2018
Creators: Luan, Xin’gang and Zou, Yun and Hai, Xiaohu and Bai, Hui and Zhang, Qing and Riedel, Ralf and Cheng, Laifei
Title: Degradation mechanisms of a self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite at high temperature under different oxidizing atmospheres
Language: English
Abstract:

Chemical vapor-infiltrated self-healing SiC(f)/BN(i)/[SiC-B4C](m) composite specimens were exposed at 1300 °C for 300 h at atmospheric pressure under two different oxidizing atmospheres (i.e., wet (12%H2O:8%O2:80%Ar) and dry (0.01%O2:99.99%Ar)) representative of rich and poor oxidizing conditions, respectively. Mechanical testing, microstructural observations, and element analyses were performed on the treated specimens. The flexural strength retentions of the specimens were 47.9 and 39.4% under wet and dry oxygen conditions, respectively. The SiC and B4C matrices were severely oxidized under wet oxygen conditions, whereas the BN interphase remained intact. The BN interphase and the B4C layered phase were both partially oxidized under dry oxygen conditions. Thus, the SiC(f)/BN(i)/[SiC-B4C](m) composites exhibited improved oxidation resistance under wet oxygen atmospheres as compared to dry oxygen conditions as a result of the formation of borosilicate glasses. In addition, two different degradation mechanisms for the composites during the oxidation process were discussed.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 38
Number: 11
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: SiC(f)/BN(i)/[SiC-B4C]((m)), Self -healing, Oxidation behavior, Degradation mechanism
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 12 Jul 2018 08:13
DOI: 10.1016/j.jeurceramsoc.2018.05.001
Official URL: https://doi.org/10.1016/j.jeurceramsoc.2018.05.001
Funders: The authors acknowledge the financial supports from the Res. Fund of State Key Lab. of Solidification Processing (NWPU), China (Grant No. 135-QP-2015), the Nat. Key Techn. R&D Prog. (Grant No. 2017YFB0703200) and Fund. Res. Fund Centr.Univ. 3102017zy05.
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