文章摘要
含硼聚碳硅烷的制备及热解行为
Synthesis and Pyrolysis of Boron-Containing Polycarbosilane
  
DOI:10.16865/j.cnki.1000-7555.2018.04.019
中文关键词: 聚碳硅烷  改性  热解  碳化硅先驱体
英文关键词: polycarbosilane  modification  pyrolysis  precursor for silicon carbide
基金项目:陕西省自然科学基础研究计划青年人才项目(2016JQ5098); 陕西省科技厅自然科学重大基础研究项目(2017ZDJC-22); 陕西省教育厅专项科研计划(17JK0380)
作者单位
马爱洁1,2, 罗瑞盈1, 杨晶晶2, 陈卫星2, 冯 超2 1. 北京航空航天大学 物理科学与核能工程学院北京 100083 2. 西安工业大学 材料与化工学院陕西 西安 710021 
摘要点击次数: 110
全文下载次数: 
中文摘要:
      为制备陶瓷产率高、高温性能优良的碳化硅(SiC)陶瓷先驱体,利用频那醇硼烷(PINB)与聚碳硅烷(PCS)的脱氢偶合反应,对聚碳硅烷进行化学改性。改变PINB与PCS的质量比(1∶20、1∶10、1∶5),制备了一系列不同硼(B)含量的含硼聚碳硅烷(PBCS)。通过傅里叶变换红外光谱分析、核磁共振氢谱分析、热重分析以及X射线衍射分析等手段研究了PBCS的组成、结构及热解行为。结果表明,通过B-H键的反应将B元素以PINB骨架形式引入PCS结构;引入B元素可以将PCS的陶瓷产率从78%提高至92%;另外,B元素的引入引起PCS的交联,PBCS的热解过程分3个阶段。同时B元素的引入抑制了SiC晶体的生长,将材料的耐温性能提高至1400 ℃。
英文摘要:
      In order to obtain precursor with high ceramic yield and silicon carbide (SiC) products with excellent thermal stability, pinacolborane (PINB) was introduced to modify polycarbosilane (PCS). Dehydrogenation reaction was concerned. Several boron-containing polycarbosilanes (PBCS) were prepared with different mass ratio between PINB and PCS (1∶20, 1∶10, 1∶5). FT-IR, 1H-NMR, TGA and XRD were used to characterize the samples. It demonstrates that boron is introduced to the PCS structure by dehydrogenation reaction as PINB backbone. The introduction of boron might increase the ceramic yield of precursor from 78% to 92%. And the cross-inking reaction of PCS is also enhanced by PINB. Results demonstrate that the pyrolysis process of PBCS includes three stages. Moreover, the growth of SiC crystals is inhibited, due to introduction of boron. And the high temperature heat resistance of B-containing SiC ceramics is enhanced to 1400 ℃.
查看全文   查看/发表评论  下载PDF阅读器
关闭