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- Title
Polyborosilazane‐Derived High Temperature Resistant SiBCNO.
- Authors
Luan, Xingang; Zhang, Qiqi; Yu, Rong; Wang, Lei; Cheng, Laifei; Li, Jianzhang; Fasel, Claudia; Riedel, Ralf
- 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 °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 °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 N2, the ceramic yield at 1400 °C is high and amounts 85.6 wt%. Furthermore, the elemental composition of the resulting SiBCNO does not change significantly at T > 1200 °C even after heat‐treatment at 1600 °C indicating the high temperature stability of the resulting SiBCNO material.
- Subjects
HIGH temperatures; THERMAL analysis; CERAMICS
- Publication
Advanced Engineering Materials, 2019, Vol 21, Issue 5, pN.PAG
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201801295