非水解溶胶-凝胶法结合碳热还原法制备β-SiC粉体

发布时间：2018-03-04 17:31

  本文选题：非水解溶胶-凝胶法　切入点：碳热还原技术　出处：《耐火材料》2017年06期 　论文类型：期刊论文

【摘要】：为了用较为简便的方法以及廉价原料制备出β-SiC粉体,采用非水解溶胶-凝胶法,以分析纯的四氯化硅(SiCl4)、正硅酸四乙酯(TEOS)为原料,加入催化剂无水氯化铁(FeCl_3)制备出溶胶,然后转移至反应釜中能制备出SiO_2干凝胶。分别以SiO_2干凝胶或石英砂为硅源,与炭黑混合,SiO_2干凝胶或石英砂与炭黑的质量比为3 2,采用碳热还原技术,在氩气气氛中于1 500℃保温2.5 h制备出SiC粉体。采用FTIR、XRD和SEM测试方法研究凝胶过程以及碳热还原产物。结果表明:原料TEOS经过非水解缩合反应制备出的SiO_2干凝胶活性较高,而后用其制备出物相较为纯净的SiC粉体,其晶粒尺寸细小,粒径均匀,粉体表面存在少量的短晶须。
[Abstract]:In order to prepare 尾 -SiC powder by simple method and cheap raw material, the sol was prepared by non-hydrolytic sol-gel method, using pure silicon tetrachloride (SiCl _ 4), tetraethyl orthosilicate (TEOS) as raw material and adding anhydrous ferric chloride (FeCl _ 3) as catalyst. The SiO_2 xerogels can be prepared by transfer to the reactor, using SiO_2 xerogels or quartz sand as silicon source, mixed with carbon black, or silica sand / carbon black, the mass ratio of silica sand to carbon black is 3.2. SiC powder was prepared in argon atmosphere at 1 500 鈩，

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