Preparation and properties of silica fiber reinforced dielectric ceramic matriz composites

摘要：

Nitride ceramics with excellent high temperature dielectric properties, such as boron nitride and silicon nitride, have become the requisite for the hypersonic aircraft. In this paper, a preceramic polymer, hybrid polyborosilazane was synthesized from borazine and perhydropolysilazane, and silica fiber reinforced nitride composite materials were prepared through vacuum infiltration of polymer and pyrolysis under inert atmosphere. The mechanical properties, microstructures and dielectric properties of the composites were investigated. The results show that the composites have good mechanical properties, the flexural strength is 148.2 MPa, and the elastic modulus is 41.5 GPa. The dielectric properties of the composites are excellent, the dielectric constant is 3.31, and the loss tangent is 3.8 × 10-3.

关键词： dielectric properties ceramics composite materials precursor

作者: Bin LI Feng CAO Changrui ZHANG Junsheng LI

作者单位: State Key Laboratory of Advanced Ceramic Fibers & Composites, College of Aerospace & Materials Engineering, National University of Defense Technology, Changsha 410073, CHINA

会议类型: 国际会议

会议名称: 第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

会议地点: 哈尔滨

会议语种:英文

页码: 382-384

在线出版日期: 2009-07-19（万方平台首次上网日期，不代表论文的发表时间）