硅酸盐学报

高气孔率及低热导率多孔莫来石陶瓷的制备

作者：刘瑞平1 2 李玉涛2 汪长安1 2 铁生年1

单位：1.青海大学化工学院西宁810016 2.清华大学材料学院新型陶瓷与精细工艺国家重点实验室北京100084

关键词：多孔莫来石气孔率烧结热导率

分类号：TB32

出版年,卷(期):页码：2014,42(6):703-708

DOI：10.7521/j.issn.0454-5648.2014.06.03

摘要：

采用叔丁醇基凝胶注模工艺制备多孔莫来石陶瓷，研究了固含量和烧结工艺对多孔莫来石陶瓷显微结构、气孔率、气孔尺寸及分布、压缩强度和室温热导率的影响。结果表明，固含量相同时，随着烧结温度的升高，多孔莫来石陶瓷的气孔率不断降低，而抗压强度则不断增加；当固含量为15%、烧结温度为1350℃时，多孔莫来石陶瓷的气孔率最高为71.7%，平均气孔孔径为3.49μm，而热导率则低至0.103W/(m•K)。通过改变烧结温度和初始固含量可调整多孔莫来石陶瓷的微观结构和性能。

Porous mullite ceramics were prepared by tert-butyl alcohol (TBA)-based gel-casting method. Effects of solids loading and sintering temperature on the microstructure, porosity, pore size distribution, compressive strength and thermal conductivity of porous mullite ceramics were investigated. The results show that the porosity decreases and the compressive strength increases with the increases of the sintering temperature. Porous mullite ceramics with the porosity of 71.7%, the average pore size of 3.49 μm and the thermal conductivity of 0.103 W/(m•K) are prepared when the solid loading and sintering temperature are 15% and 1 350℃. The desigened microstructure and properties of porous mullite ceramics can be obtained via the adjustment of the sintering temperature and initial solid loading.

基金项目：

国家自然科学基金(51172119和51202117)资助项目。

作者简介：

第一作者：刘瑞平(1983—)，男，博士后。通信作者：汪长安(1969—)，男，博士，教授。

参考文献：

[1]　FENG Yi, WANG Kun, YAO Jianfeng, et al. Effect of the addition of polyvinylpyrrolidone as a pore-former on microstructure and mechanical strength of porous alumina ceramics ［J］. Ceram Int, 2013, 39: 7551-7556.
[2]　OHJI T, FUKUSHIMA M. Macro-porous ceramics: processing and properties ［J］. Int Mater Rev, 2012, 57: 115-131.
[3]　HU Liangfa, WANG Chang-An, HUANG Yong. Porous yttria-stabilized zirconia ceramics with ultra-low thermal conductivity ［J］. J Mater Sci, 2012, 45: 3242-3246.
[4]　BAREA R, OSENDI M I, JOSE M F, et al. Thermal conductivity of highly porous mullite material ［J］. Acta Mater, 2005, 53: 3313-3318.
[5]　LIU Ruiping, Wang Chang-an. Effects of mono-dispersed PMMA micro-balls as pore-forming agent on the properties of porous YSZ ceramics ［J］. J Eur Ceram Soc, 2013, 33: 1859-1865.
[6]　DENG Henyan, YAN Jianfeng, BEPPU Y, et al. Effect of agglomeration on mechanical properties of porous zirconia fabricated by partial sintering ［J］. J Am Ceram Soc, 2002, 85: 1961-1965.
[7]　ZHOU Kechao, ZHANG Yan, ZHANG Dou, et al. Porous hydroxyapatite ceramics fabricated by an ice-templating method［J］. Scripta Mater, 2011, 64: 426-429.
[8]　HOU Zhenguang, LIU Jiachen, DU Haiyan, et al. Preparation of porous Y2SiO5 ceramics with relatively high compressive strength and ultra-low thermal conductivity by a TBA-based gel-casting method ［J］. Ceram Int, 2013, 39: 969-976.
[9]　HU L F, WANG C A, HUANG Y. Porous yttria-stabilized zirconia ceramics with ultra-low thermal conductivity ［J］. J Mater Sci, 2010, 45: 3242-3246.
[10]　HASHIN Z, SHTRIKMAN S. A variational approach to the theory of the effective magnetic permeability of multiphase materials ［J］. J Appl Phys, 1962, 33: 3125-3131.
[11]　CARSON J, LOVATT S, TANNER D, et al. Thermal conductivity bounds for isotropic, porous materials ［J］. Int J Heat Mass Transfer, 2005, 48: 2150-2158.
[12]　LANDAUER R. The electrical resistance of binary metallic mixtures ［J］. J Appl Phys, 1952, 23: 779-784.

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