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Wet oxidation behavior of C/SiC–SiHf(B)CN composites at high temperature

Luan, Xingang and Zhang, Jiahao and Wang, Lei and Wen, Qingbo and Yu, Zhaoju and Cheng, Laifei and Riedel, Ralf (2020):
Wet oxidation behavior of C/SiC–SiHf(B)CN composites at high temperature.
In: Advanced Composites and Hybrid Materials, 3 (3), pp. 415-429. Springer Nature, ISSN 2522-0128, e-ISSN 2522-0136,
DOI: 10.1007/s42114-020-00172-2,
[Article]

Abstract

To further improve the oxidation resistance of C/SiC-SiBCN at temperatures over 1200 degrees C, C/SiC-SiHfCN and C/SiC-SiHfBCN composites were prepared by a new method called chemical vapor infiltration (CVI) combined with polymer infiltration and on-line pyrolysis (PIOP) process. The weight change behavior, mechanical properties, and microstructure of C/SiC-SiHf(B)CN before and after oxidation in wet oxygen were studied in detail. Through the replacement of B by Hf, the weight loss of the composite in high-temperature wet oxygen environment has been significantly reduced. The strength retention of C/SiC-SiHfBCN is up to 75% after oxidation in wet oxygen at 1400 degrees C and the strength retention of C/SiC-SiHfBCN can reach 85% after oxidation in an atmosphere with high oxygen and water vapor content at 1300 degrees C. In addition, microscopic analysis showed that after oxidation at 1400 degrees C, only the fibers in the near-surface matrix were oxidized to some extent and hafnium has been enriched at the composite surface. Our work provides a reference for the study of the oxidation resistance of C/SiC composites in harsh environments.

Item Type: Article
Erschienen: 2020
Creators: Luan, Xingang and Zhang, Jiahao and Wang, Lei and Wen, Qingbo and Yu, Zhaoju and Cheng, Laifei and Riedel, Ralf
Title: Wet oxidation behavior of C/SiC–SiHf(B)CN composites at high temperature
Language: English
Abstract:

To further improve the oxidation resistance of C/SiC-SiBCN at temperatures over 1200 degrees C, C/SiC-SiHfCN and C/SiC-SiHfBCN composites were prepared by a new method called chemical vapor infiltration (CVI) combined with polymer infiltration and on-line pyrolysis (PIOP) process. The weight change behavior, mechanical properties, and microstructure of C/SiC-SiHf(B)CN before and after oxidation in wet oxygen were studied in detail. Through the replacement of B by Hf, the weight loss of the composite in high-temperature wet oxygen environment has been significantly reduced. The strength retention of C/SiC-SiHfBCN is up to 75% after oxidation in wet oxygen at 1400 degrees C and the strength retention of C/SiC-SiHfBCN can reach 85% after oxidation in an atmosphere with high oxygen and water vapor content at 1300 degrees C. In addition, microscopic analysis showed that after oxidation at 1400 degrees C, only the fibers in the near-surface matrix were oxidized to some extent and hafnium has been enriched at the composite surface. Our work provides a reference for the study of the oxidation resistance of C/SiC composites in harsh environments.

Journal or Publication Title: Advanced Composites and Hybrid Materials
Journal volume: 3
Number: 3
Publisher: Springer Nature
Uncontrolled Keywords: National Key R&D Programof China, Grant Number 2017YFB1103500, National Natural Science Foundation of China (NSFC), Grant Numbers 91960105 91860140 51672218 51632007 51821091, C/SiC; PDC; SiHf(B)CN; Matrix modification; Oxidation CERAMIC COMPOSITES; WATER-VAPOR; COATINGS; KINETICS
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: 20 Oct 2020 05:32
DOI: 10.1007/s42114-020-00172-2
Official URL: https://link.springer.com/article/10.1007/s42114-020-00172-2
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