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Polyborosilazane-Derived High Temperature Resistant SiBCNO

Luan, Xingang and Zhang, Qiqi and Yu, Rong and Wang, Lei and Cheng, Laifei and Li, Jianzhang and Fasel, Claudia and Riedel, Ralf (2019):
Polyborosilazane-Derived High Temperature Resistant SiBCNO.
In: Advanced Engineering Materials, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, p. 1801295, 21, (5), ISSN 14381656,
DOI: 10.1002/adem.201801295,
[Online-Edition: https://onlinelibrary.wiley.com/doi/full/10.1002/adem.201801...],
[Article]

Abstract

One of the main features of SiBCN-based ceramics is their high temperature stability with respect to crystallization and decomposition in protective atmospheres. High temperature studies of a polyborosilazane in air up to 1500 degrees C show that the formation of coexisting nano-quartz and amorphous B2O3 is suitable for the application as adhesive for bonding advanced ceramics. Spectroscopic and X-ray studies combined with thermal analysis clearly demonstrate the strong influence of the presence of air on the cross-linking and pyrolysis behavior and, thus, finally on the ceramization process of the applied SiBCN preceramic polymer. Accordingly, cross-linking and subsequent pyrolysis of the SiBCN-precursor up to 1600 degrees C in air result in the formation of a network structure comprised of SiO2 and B2O3 with minor amounts of residual amorphous SiBCN. In contrast to the polymer-to-ceramic transformation of the used polyborosilazane in protective atmospheres like Ar or N-2, the ceramic yield at 1400 degrees C is high and amounts 85.6 wt%. Furthermore, the elemental composition of the resulting SiBCNO does not change significantly at T > 1200 degrees C even after heat-treatment at 1600 degrees C indicating the high temperature stability of the resulting SiBCNO material.

Item Type: Article
Erschienen: 2019
Creators: Luan, Xingang and Zhang, Qiqi and Yu, Rong and Wang, Lei and Cheng, Laifei and Li, Jianzhang and Fasel, Claudia and Riedel, Ralf
Title: Polyborosilazane-Derived High Temperature Resistant SiBCNO
Language: English
Abstract:

One of the main features of SiBCN-based ceramics is their high temperature stability with respect to crystallization and decomposition in protective atmospheres. High temperature studies of a polyborosilazane in air up to 1500 degrees C show that the formation of coexisting nano-quartz and amorphous B2O3 is suitable for the application as adhesive for bonding advanced ceramics. Spectroscopic and X-ray studies combined with thermal analysis clearly demonstrate the strong influence of the presence of air on the cross-linking and pyrolysis behavior and, thus, finally on the ceramization process of the applied SiBCN preceramic polymer. Accordingly, cross-linking and subsequent pyrolysis of the SiBCN-precursor up to 1600 degrees C in air result in the formation of a network structure comprised of SiO2 and B2O3 with minor amounts of residual amorphous SiBCN. In contrast to the polymer-to-ceramic transformation of the used polyborosilazane in protective atmospheres like Ar or N-2, the ceramic yield at 1400 degrees C is high and amounts 85.6 wt%. Furthermore, the elemental composition of the resulting SiBCNO does not change significantly at T > 1200 degrees C even after heat-treatment at 1600 degrees C indicating the high temperature stability of the resulting SiBCNO material.

Journal or Publication Title: Advanced Engineering Materials
Volume: 21
Number: 5
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Uncontrolled Keywords: polyborosilazane; polymer-derived ceramics; pyrolysis in air MATRIX COMPOSITES; CERAMICS; ADHESIVE
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: 16 Jul 2019 05:23
DOI: 10.1002/adem.201801295
Official URL: https://onlinelibrary.wiley.com/doi/full/10.1002/adem.201801...
Projects: State Key Laboratory of Solidification Processing (NWPU), China, SKLSP201413, State Key Laboratory of Powder Metallurgy, Central South University, 3102015BJ (ZS002), State Key Laboratory of Integrated Optoelectronics, IOSKL2018KF05, National Key Technologies RD Program, 2017YFB0703200
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