摘要
以铝矾土矿为原料,以玉米淀粉、聚甲基丙烯酸甲酯微球或稻壳粉为造孔剂,采用干压成型后经1700℃保温3 h制备了微孔莫来石骨料。用XRD、SEM借助Image-Pro Plus软件分析了造孔剂种类和添加量(质量分数分别为0、5%、10%、15%、20%)对微孔莫来石骨料性能的影响。结果表明:添加10%(w)稻壳粉的莫来石骨料的综合性能最佳,其闭气孔率为5.6%,体积密度为2.63 g·cm^(-3),耐压强度为148 MPa,中值孔径为15.16μm,500℃时的热导率为2.30 W·m^(-1)·K^(-1)。
Microporous mullite aggregates were prepared from bauxite by dry pressing and firing at 1700℃for 3 h with corn starch,PMMA microspheres or rice husk powder as the pore-forming agent.The effects of the pore-forming agents and their addition(mass fraction of 0,5%,10%,15%and 20%,respectively)on the properties of microporous mullite aggregates were analyzed by XRD,SEM and Image-Pro Plus software.The results show that the comprehensive performance of the sample with 10 mass%rice husk powder is the best,the closed porosity is 5.6%,the bulk density is 2.63 g·cm^(-3),the compressive strength is 148 MPa,the median pore size is 15.16μm,and the thermal conductivity at 500℃is 2.30 W·m^(-1)·K^(-1).
作者
金智商
单峙霖
赵惠忠
余俊
张寒
Jin Zhishang;Shan Zhilin;Zhao Huizhong;Yu Jun;Zhang Han(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;不详)
出处
《耐火材料》
CAS
北大核心
2022年第4期289-293,共5页
Refractories
基金
国家自然科学基金项目(51804233)。
关键词
微孔莫来石
孔径分布
物相组成
热导率
microporous mullite
pore size distribution
phase composition
thermal conductivity
