China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2023, Vol. 32 ›› Issue (3): 31-35.DOI: 10.19691/j.cnki.1004-4493.2023.03.007

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Effect of Porogenic Agents on Properties of Microporous Mullite Aggregates

JIN Zhishang1, SHAN Zhilin2, ZHAO Huizhong1,*, YU Jun1, ZHANG Han1   

  1. 1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
    2 Guizhou Huaxin New Material Co., Ltd., Kaili 556000, China
  • Online:2023-09-15 Published:2023-11-07
  • Contact: *e-mail: wustnano@163.com
  • About author:Jin Zhishang, born in 1996, received his master’s degree from Wuhan University of Science and Technology in 2022. His main research direction is thermal insulation refractories and microporous refractories.

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 porogenic agent. The effects of some porogenic agents and their additions (mass fraction of 0, 5%, 10%, 15% and 20%, respectively) on the properties of the 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% rice husk powder is the best: the closed porosity is 7.1%; the bulk density is 2.63 g·cm-3; the compressive strength is 122 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