用Si-Fe反应烧结制备Fe-Si_3N_4-SiC复合材料的性能研究  

Properties of Fe-Si_3N_4-SiC composites prepared by reaction sintering of ferrosilicon alloy

作　　者：朱晓燕[1] 李勇[1] 王佳平[1] 薄钧[2] 张建芳[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中钢集团耐火材料有限公司,河南洛阳473019

出　　处：《耐火材料》2010年第2期96-99,共4页Refractories

摘　　要：以FeSi75和SiC为主要原料,直接氮化反应烧结,成功制备了综合性能优异的Fe-Si3N4-SiC复合材料。对硅铁氮化进行了化学热力学计算,并分析了产物的物相组成及显微结构。结果表明,氮化产物有α-Si3N4、β-Si3N4,呈纤维状、柱状;维持一定低氧分压对氮化过程有利;产物中存在大量细分散的硅铁金属间化合物,硅铁不能完全氮化,过多Fe阻碍Si的氮化,Fe以Fe3Si形式存在。Excellent Fe-Si3N4-SiC composites were successfully prepared using FeSi75 and SiC as main starting materials by direct nitridation reaction.The ferrosilicon nitridation was analyzed through chemical thermodynamic calculation.Phase composition and microstructure of products were also analyzed.The results show that nitridation products are acicular and rod-like α-Si3N4 and β-Si3N4;maintaining certain low oxygen pressure is favorable for nitridation;a great deal of ferrosilicon intermetallic compounds uniformly distribute in matrix,ferrosilicon can＇t be nitridized completely,excessive Fe obstructs silicon nitridation,and Fe exists as Fe3Si.

关 键 词：Fe-Si3N4-SiC复合材料 化学热力学 显微结构 

分 类 号：TQ174.758[化学工程—陶瓷工业]