以Fe_2O_3为催化剂制备氧化镁晶须  

Preparation of MgO Whiskers Using Ferric Oxide as Catalyst

作　　者：程峰[1] 王军凯[1] 谭操[1] 段红娟[1] 李发亮[1] 梁峰[1] 张海军[1] 张少伟[1] 

机构地区：[1]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

出　　处：《硅酸盐学报》2017年第3期459-466,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(51272188;51472184);国家"973"计划前期研究专项(2014CB660802)

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Fe_2O_3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。MgO whiskers were in-situ synthesized via catalytic reaction using magnesia powder, flake graphite and metallic A1 powder as raw materials. The effects of reacting temperature, contents of catalysts and A1 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 Fe2O3 catalyst, 3% of A1 powders, and 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.

关 键 词：氧化镁晶须 氧化铁 催化 生长机理 

分 类 号：TQ175.71[化学工程—硅酸盐工业]