Fabrication and characterization of SiO_(2(f))/Si)_3N_4 composites

作     者：Yongsheng Liu Laifei Cheng Litong Zhang Yongdong Xu Yi Liu 

作者机构：National Key Laboratory of Thermostructure Composite Materials Northwestern Polytechnical University Xi＇an 710072 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2007年第14卷第5期

页      面：454-459页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：This study was financially supported by the Key Foundation of National Science in China (No. 90405015), the National Elitist Youth Foundation of China (No. 50425208 the Doctorate Foundation of Northwestern Polytechnical University (CX200505) 

主　　题：SiO2/ Si3N4 composite fabrication characterization chemical vapor infiltration 

摘      要：A silicon dioxide fiber-reinforced silicon nitride matrix （SiOJSi3N4） composite used for radomes was prepared by chemical vapor infiltration （CVI） process using the SiCl4-NH3-H2 system. The effects of the process conditions, including infiltration temperature, infiltration time, and gas flux were investigated. The energy dispersion spectra （EDS） result showed that the main elements of this composite contained Si, N, and O. The X-ray diffraction （XRD） results indicated that phases of the composite before and after treatment at 1350℃ were all amorphous. A little fiber pull-out was observed on the cross section of the composite by scan electron microscope （SEM）. As a result, the composite exhibited good thermal stability, but an appropriate interface was necessary between the fiber and the matrix.