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 condition...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.展开更多
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.50425208the Doctorate Foundation of Northwestern Polytechnical University(CX200505).
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.
基金The Special funds for Major State Basic Research Projects under Grant G2000036504,andin part by National High Technology Research and Development Program of China under Grant2003AA1Z1370