Si_3N_4/SiBN复合材料界面设计及制备  

Interface Design and Preparation of Si_3N_4/SiBN Composites

作　　者：门薇薇[1,2] 马娜 张术伟 轩立新 MEN Weiwei;MA Na;ZHANG Shuwei;XUAN Lixin(Research Institute for Special Structures of Aeronautical Composites AVIC,Ji＇nan 250023,Shandong,China;The Aeronautical Science Key Lab for High Performance Electromagnetic Windows,Ji＇nan 250023,Shandong,China)

机构地区：[1]中国航空工业集团公司济南特种结构研究所,山东济南250023 [2]高性能电磁窗航空科技重点实验室,山东济南250023

出　　处：《陶瓷学报》2018年第5期568-573,共6页Journal of Ceramics

摘　　要：为阻止纤维与基体之间界面反应,对Si_3N_4/SiBN复合材料进行界面设计,首先采用500℃高温热处理的方法去除纤维表面浸润剂,并以PIP工艺制备了BN界面涂层,经过4轮PIP工艺后制备出致密的Si_3N_4/SiBN复合材料。结果表明:500℃高温热处理的方法基本可去除氮化物纤维表面浸润剂;BN涂层可有效缓解Si_3N_4纤维-SiBN基体之间的强结合;Si_3N_4/SiBN复合材料的密度为1.83 g/cm^3,弯曲强度为96.8 MPa,介电常数和介电损耗角正切值分别为3.25,0.012。In order to prevent the interface reaction between fber and matrix, the interface design of Si3N4/SiBN composites was carried out. First, the infltration agent on the surface of Si3N4 fber was removed by 500 °C heat treatment. Then BN coated Si3N4 fber was prepared by precursor impregnation and pyrolysis technology. After 4 rounds of impregnation, curing and pyrolysis, dense Si3N4/SiBN composites were prepared. Study shows： 500 °C heat treatment can remove the infltration agent on the surface of Si3N4 fber; BN coating can efectively alleviate the strong bonding between Si3N4 fber and SiBN substrate. The density of Si3N4/SiBN composite is 1.83 g/cm3, the fexural strength reaches 96.8 MPa, the dielectric constant and the loss tangent are 3.25 and 0.012.

关 键 词：透波材料 PIP Si3N4/SiBN 

分 类 号：TQ174.75[化学工程—陶瓷工业]