Preparation and Properties of Si3N4 Based Composites for Broad Band Radomes

摘要：

　　A new preparation method was developed to produce Si3N4-SiO2-Si2N2O composites for broad band radome applications.The three-dimensional cross-linked polyphenylsiloxane (PPS) was used as an organic precursor.The composites obtained through react bonding between Si and the precursor powders in the stream of N2 were examined.The conversion of the PPS polymer to the ceramic was examined by TG analysis and conventional X-ray diffraction (XRD) techniques.It was found that the ceramics contained a primary Si2N2O phase,some β-Si3N4 phase and a minor α-SiO2 phase.Despite low density (1.7-2.0g·cm-3),the flexural strengths of the composites reaches 195Mpa at room temperature.The ceramic has excellent dielectric properties with dielectric constants as low as 3.2-5.5.

关键词： Si3N4-SiO2-Si2N2O composites organic precursor strength dielectric properties

作者: Mingli LI Qiong YU Ying XU Chunjiang ZHOU Zicheng QI Qingguo LU

作者单位: Ningbo Branch of China Academy of Ordnance Science, Ningbo 315103, China

会议类型: 国际会议

会议名称: 2012 2nd international Conference on Materials Science and Information Technology(2012第二届材料科学与信息技术国际会议)(MSIT2012)

会议地点: 西安

会议语种:英文

页码: 57-60

在线出版日期: 2012-08-24（万方平台首次上网日期，不代表论文的发表时间）