以Fe2O3 为催化剂制备氧化镁晶须 - 硅酸盐学报.PDF

第45 卷第3 期 硅 酸 盐 学 报 Vol. 45，No. 3 2 0 1 7 年 3 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY March ，2017 DOI ：10.14062/j.issn.0454-5648.2016.03.20 以Fe O 为催化剂制备氧化镁晶须 2 3 程 峰，王军凯，谭 操，段红娟，李发亮，梁 峰，张海军，张少伟 (武汉科技大学，省部共建耐火材料与冶金国家重点实验室，武汉 430081) 摘 要：以镁砂细粉、鳞片石墨及金属铝粉等为原料，采用催化反应原位制备 MgO 晶须，研究了催化剂和铝粉的用量及热 处理温度对MgO 晶须生长行为的影响，探讨了MgO 晶须的生长机理。结果表明，MgO 晶须的最佳生长条件为：催化剂Fe2O3 的加入量为1%，金属铝粉的用量为3%，热处理温度为1 673 K 保温2 h ；该条件下所制备MgO 晶须的长径比约为10~100， 且MgO 晶须的生长过程由V–L–S 机理控制。 关键词：氧化镁晶须；氧化铁；催化；生长机理 中图分类号：TQ175.71 文献标志码：A 文章编号：0454–5648(2017)03–0459–08 网络出版时间： 网络出版地址： Preparation of MgO Whiskers Using Ferric Oxide as Catalyst CHENG Feng, WANG Junkai, TAN Cao, DUAN Hongjuan, LI Faliang, LIANG Feng , ZHANG Haijun, ZHANG Shaowei (The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China) Abstract: To optimize the matrix composition of low-carbon MgO–C refractory, MgO whiskers were in-situ synthesized via catalytic reaction using magnesia powder, flake graphite and metallic Al powder as raw materials. The effects of reacting temperature, contents of catalysts and Al powder on the formation of MgO whiskers were investigated, and the growth mechanism was discussed. The results indicate that MgO whiskers can be obtained under optimal conditions (i.e., 1% of Fe O catalyst, 3% of Al powders, and 2 3 holding at 1 673 K for 2 h). MgO whiskers with an aspect ratio of 10– 100 are formed based on the V–L–S mechanism. Keywords: magnesium oxide whiskers; ferric oxide; catalyst; growth mechanism 镁碳耐火材料