Processing and performance of 2D fused-silica fiber reinforced porous Si_3N_4 matrix composites  

作　　者：Guifang Han Litong Zhang Laifei Cheng 

机构地区：[1]National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi＇an 710072, China

出　　处：《Journal of University of Science and Technology Beijing》2008年第1期58-61,共4页北京科技大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.90405015);the National Young Elitist Foundation(No.50425208).

摘　　要：Two-dimension （2D） fused-silica fiber reinforced porous silicon nitride matrix composites were fabricated using slurry impregnation and cyclic infiltration with colloidal silica sol. The microstructure and fracture surface were characterized by SEM, the mechanical behavior was investigated by three-point bending test, and the dielectric constant was also measured by impedance analysis. The microstructure showed that the fiber and the matrix had a physical bonding, forming a clearance interface. The mechanical behavior suggested that the porous matrix acted as crack deflection, and the fracture surface had a lot of fiber pull-out. However, the interlaminar shear strength was not so good. The dielectric constant of the composites at room temperature was about 2.8-3.1. The relatively low dielectric constant and non-catastrophic failure indicated the potential application in the radome materials field. 2008 University of Science and Technology Beijing. All rights reserved.Two-dimension （2D） fused-silica fiber reinforced porous silicon nitride matrix composites were fabricated using slurry impregnation and cyclic infiltration with colloidal silica sol. The microstructure and fracture surface were characterized by SEM, the mechanical behavior was investigated by three-point bending test, and the dielectric constant was also measured by impedance analysis. The microstructure showed that the fiber and the matrix had a physical bonding, forming a clearance interface. The mechanical behavior suggested that the porous matrix acted as crack deflection, and the fracture surface had a lot of fiber pull-out. However, the interlaminar shear strength was not so good. The dielectric constant of the composites at room temperature was about 2.8-3.1. The relatively low dielectric constant and non-catastrophic failure indicated the potential application in the radome materials field. 2008 University of Science and Technology Beijing. All rights reserved.

关 键 词：porous matrix composites fused-silica fiber SI3N4 mechanical behavior dielectric constant 

分 类 号：TG146.1[一般工业技术—材料科学与工程]