| 引用本文: | 邹晓蓉,张长瑞,曹峰,等.氮化硼先驱体的合成及其热分解特性.[J].国防科技大学学报,2009,31(1):33-37.[点击复制] |
| ZOU Xiaorong,ZHANG Changrui,CAO Feng,et al.Synthesis and Pyrolysis of the Precursor for Boron Nitride[J].Journal of National University of Defense Technology,2009,31(1):33-37[点击复制] |
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| 氮化硼先驱体的合成及其热分解特性 |
| 邹晓蓉, 张长瑞, 曹峰, 王思青, 李斌, 姜勇刚, 李俊生 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 以硼氢化锂和硫酸铵为原料合成了氮化硼陶瓷先驱体环硼氮烷，以GC-MS、FT-IR和1H-NMR等方法对其组成和结构进行了表征和确认。环硼氮烷在80℃左右保温72h后可以得到固化的聚硼氮烷，而后经热分解得到氮化硼陶瓷，以TG、FT-IR、XRD等对聚硼氮烷的热分解行为进行了分析和表征。结果表明聚硼氮烷中仍然存在一定数量的B-H和N-H键，在后续的热分解过程中，会进一步发生脱氢反应，1400℃时陶瓷产率约为89.5％。B-H键的断裂主要发生在800℃以前，N-H键的消失则需要较高的温度。聚硼氮烷800℃热分解后无机化程度已经较高，其产物基本上为无定形的BN，在1600℃则形成h-BN。 |
| 关键词: 氮化硼 环硼氮烷 聚硼氮烷 先驱体 热分解 |
| DOI： |
| 投稿日期：2008-08-27 |
| 基金项目:国家部委基金资助项目 |
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| Synthesis and Pyrolysis of the Precursor for Boron Nitride |
| ZOU Xiaorong, ZHANG Changrui, CAO Feng, WANG Siqing, LI Bin, JIANG Yonggang, LI Junsheng |
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(College of Aerospace and Materials Engineering，National Univ. of Defense Technology，Changsha 410073，China)
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| Abstract: |
| Borazine, a precursor for BN, was synthesized by a reaction of LiBH4 with (NH4)2SO4. The composition and structure of the synthesized product was characterized and confirmed by GC-MS, FT-IR and 1H-NMR. Cured polyborazine was obtained by heating borazine at 80℃ for 72hrs and was converted to BN ceramic after pyrolysis. The pyrolysis behavior of polyborazine was investigated based on TG, FT-IR and XRD analysis. The results show that polyborazine still holds some B-H and N-H bonds, which will be continuously dehydrogenated when heated, and the ceramic yield is about 89.5％at 1400℃. Bonds of B-H are broken mainly before 800℃, while disappearance of N-H bonds occurs at much higher temperature. The inorganic extent is high and amorphous BN is obtained when polyborazine is pyrolyzed at 800℃, while h-BN is obtained when it is pyrolyzed at 1600℃. |
| Keywords: boron nitride borazine polyborazine precursor pyrolysis |
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