1800℃烧成含铁SiC纤维的微观结构分析
Microstructure of iron-containing SiC fibers sintered at 1800℃
Abstract
以羰基铁为铁源,制备了含铁SIC纤维,并经1800℃x5MIn烧成。分别以扫描电子显微镜(SEM)、透射电子显微镜(TEM)及其能谱仪(EdS)表征了烧成纤维的微观结构和微区成分。结果表明,烧成纤维由致密的晶粒区及较为疏松的晶间区两部分组成。前者的主要成分是SIC和fE;后者则包括游离碳及SICXOy。烧成纤维的微观组织仍然致密,表明其所含的少量铁具有明显促进SIC纤维高温致密化的作用。 Iron-containing SiC fibers were prepared using iron pentacarbonyl [Fe(CO)5 ] as the iron source,then sintered at 1800℃.The microstructure and the element of the sintered fibers were characterized by TEM-EDS.Results show that the sintered fibers consist of crystalline regions(compact regions) and amorphous regions(loose regions).The crystalline regions are composed of SiC and Fe,while the amorphous regions are made up of free C and SiCxOy phase.After sintered at high temperature of 1800℃,densification of the SiC fibers was promoted for the presence of Fe.