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材料研究学报  2008, Vol. 22 Issue (3): 291-296    
  论文 本期目录 | 过刊浏览 |
聚硼硅氮烷先驱体的合成及其目标陶瓷SiBNC的性能
唐云;王军;李效东;李文华;王浩;谢征芳;商遥
国防科技大学CFC国防科技重点实验室
Composition and structure of polyborosilazane and ceramics thereof
TANG Yun;;;;;;
国防科技大学CFC国防科技重点实验室
引用本文:

唐云; 王军; 李效东; 李文华; 王浩; 谢征芳; 商遥 . 聚硼硅氮烷先驱体的合成及其目标陶瓷SiBNC的性能[J]. 材料研究学报, 2008, 22(3): 291-296.
, , , , , , . Composition and structure of polyborosilazane and ceramics thereof[J]. Chin J Mater Res, 2008, 22(3): 291-296.

全文: PDF(1093 KB)  
摘要: 以三氯化硼、甲基氢二氯硅烷、六甲基二硅氮烷为起始原料,通过共缩合路径合成了SiBNC陶瓷先驱体-聚硼硅氮烷(PBSZ),将PBSZ在氨气气氛中高温热解可得SiBNC陶瓷. 对先驱体及其陶瓷产物的组成、结构和高温结晶性能进行了研究. 结果表明, 先驱体的骨架结构为-Si-N-B-,其中, B、N以硼氮六环形式存在. 1000℃的陶瓷产率为61%, 陶瓷中碳含量低于0.5%,具有较好的热稳定性能, 能够在1700℃以上保持非晶, 在1850℃部分结晶,主要由Si3N4、BN和少量SiC组成, 1500℃-1850℃间质量损失约为10%.
关键词 无机非金属材料SiBNC陶瓷聚硼硅氮烷    
Abstract:Polyborosilazane (PBSZ), a precursor to SiBNC ceramic, was synthesized via cocondensadition approach using methyldichlorosilane (MeHSiCl2), boron trichloride (BCl3) and hexamethydisilazane (HMDZ) as the starting materials. SiBNC ceramics were obtained when pyrolysising the as-synthesized PBSZ in NH3/N2 atmosphere. The chemical composition, structure and high temperature properties of the obtained polymer and ceramics were investigated using EA, FTIR, NMR, XPS and XRD. The results indicate that the backbone of PBSZ is -Si-N-B- linkage in the form of borazine and C is in the form of Si-CH3. The ceramic yield of the PBSZ at 1000 ℃ in NH3/N2 atmosphere is 61%. The products have low carbon content (<0.5%)and show excellent high temperature stability. They are fully amorphous after heated to 1700 ℃ and result in partially crystallized Si3N4、BN、SiC phases when heated to 1850 ℃.The weight loss of SiBNC ceramics at 1500 ℃~1850 ℃ is about 10%.
Key wordsSiBNC ceramics    polyborosilazane    polymer prolysis    preceramic polymer    amorphous ceramics    low carbon
收稿日期: 2007-06-28     
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