耐火材料

耐火材料 ›› 2022, Vol. 56 ›› Issue (4): 289-293.DOI: 10.3969/j.issn.1001-1935.2022.04.003

• 研究开发 • 上一篇    下一篇

造孔剂对微孔莫来石骨料性能的影响

金智商1), 单峙霖2), 赵惠忠1), 余俊1), 张寒1)   

  1. 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 湖北武汉 430081
    2)贵州华鑫新材料有限公司 贵州凯里 556000
  • 收稿日期:2021-10-15 出版日期:2022-08-15 发布日期:2022-11-09
  • 作者简介:金智商:男,1996年生,硕士研究生。E-mail:841403037@qq.com
  • 基金资助:
    国家自然科学基金项目(51804233)。

Effect of pore-forming agents on properties of microporous mullite aggregates

Jin Zhishang, Shan Zhilin, Zhao Huizhong, Yu Jun, Zhang Han   

  1. The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
  • Received:2021-10-15 Online:2022-08-15 Published:2022-11-09

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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1 700 ℃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 15.16 μm,500 ℃时的热导率为2.30 W·m-1·K-1。

关键词: 微孔莫来石, 孔径分布, 物相组成, 热导率

Abstract: Microporous mullite aggregates were prepared from bauxite by dry pressing and firing at 1 700 ℃ 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 15.16 μm,and the thermal conductivity at 500 ℃ is 2.30 W·m-1·K-1.

Key words: microporous mullite, pore size distribution, phase composition, thermal conductivity

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