Effect of molecular monomer structure on the composition and properties of BN via the preceramic polymer route

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• 作者：Yongpeng Lei^a ; ^{lypkd@yahoo.com.cn} ; Yingde Wang ; ^a ; ^{wyd502@163.com} ; Yongcai Song^a ; Hao Wang^a ; Zhengfang Xie^a ; Cheng Deng^a
• 关键词：Molecular structure ; Polymers ; Ceramics ; Microstructure ; Thermal properties
• 刊名：Materials Letters
• 出版年：2011
• 出版时间：15 April 2011
• 年：2011
• 卷：65
• 期：7
• 页码：1111-1113
• 全文大小：510 K

文摘

Boron nitride (BN) ceramics were prepared via the preceramic polymer route from two (alkylamino)borazine (AAB) monomers. The effect of monomer structure on the chemical composition, microstructure, oxidation resistance and high-temperature stability of BN was investigated. The two ceramics were characterized by elemental analysis (EA), IR, XPS, XRD, HRTEM and TGA. With similar composition, BN derived from symmetric monomer had a higher crystallinity and exhibited better oxidation resistance/high temperature stability. This is due to that the structure of symmetric molecular derived polymeric precursor is close to that of hexagonal BN (h-BN).