摘要
MgAl_(2)O_(4)纤维的主要制备方法为气相法,但该方法存在反应温度高、制备成本高以及产率低等问题。将碱式硫酸镁晶须作为模板,分别与铝溶胶或α-Al_(2)O_(3)微粉混合,通过固相反应制备了MgAl_(2)O_(4)多孔纤维,研究了热处理温度(1000、1100和1300℃)和保温时间(3、10 h)以及铝源(铝溶胶和α-Al_(2)O_(3)微粉)对MgAl_(2)O_(4)多孔纤维合成的影响。结果表明:1)与α-Al_(2)O_(3)微粉相比,以铝溶胶为铝源时,纤维中MgAl_(2)O_(4)生成量更高;2)随着热处理温度的升高,Al_(2)O_(3)与MgO逐渐反应完全,MgAl_(2)O_(4)的生成量不断增加,MgAl_(2)O_(4)多孔纤维上有小而均匀的纳米孔;3)最佳制备工艺是以铝溶胶为铝源,在1300℃保温3 h。
The gas phase method is the main preparation method of MgAl_(2)O_(4)fibers,but it has problems such as high reaction temperatures,high cost,and low yield.Porous MgAl_(2)O_(4)fibers were prepared using basic magnesium sulfate whiskers as templates,mixing with alumina sol orα-Al_(2)O_(3)micropowder through the solid-state reaction.The effects of the heat treatment temperature(1000,1100 and 1300℃),holding time(3 and 10 h),and alumina source(alumina sol andα-Al_(2)O_(3))on the synthesis of the porous MgAl_(2)O_(4)fibers were studied.The results show that:(1)compared with the fiber usingα-Al_(2)O_(3)as the alumina source,the one using alumina sol generates more MgAl_(2)O_(4);(2)as the heat treatment temperature increases,Al_(2)O_(3)tends to react completely with MgO,thus continuously increasing the forming amount of MgAl_(2)O_(4),and the synthesized porous MgAl_(2)O_(4)fibers have small and uniform nanopores;(3)the optimal synthesis process is using alumina sol as the alumina source and firing at 1300℃for 3 h.
作者
王昕悦
许晴
朱欣欣
周瑞琪
段红娟
张海军
李少平
Wang Xinyue;Xu Qing;Zhu Xinxin;Zhou Ruiqi;Duan Hongjuan;Zhang Haijun;Li Shaoping(不详;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)
出处
《耐火材料》
CAS
北大核心
2024年第3期190-194,共5页
Refractories
基金
国家自然科学基金面上项目(52072274,52272021)
国家自然科学基金重点项目(52232002)
湖北三峡实验室开放/创新基金(SK232006)。
