海藻酸钠离子凝胶法制备直通孔氧化铝多孔陶瓷

doi:10.15541/jim20150049

无机材料学报 ›› 2015, Vol. 30 ›› Issue (8): 877-881.DOI: 10.15541/jim20150049 CSTR: 32189.14.10.15541/jim20150049

海藻酸钠离子凝胶法制备直通孔氧化铝多孔陶瓷

孙阳^1,2, 薛伟江², 孙加林¹, 周国治¹, 黄勇²

(1. 北京科技大学材料科学与工程学院, 北京100083; 2. 清华大学新型陶瓷与精细工艺国家重点实验室, 材料科学与工程学院, 北京 100084)

收稿日期:2015-01-22 修回日期:2015-04-21 出版日期:2015-08-20 网络出版日期:2015-07-21
作者简介:孙阳(1956–), 男, 博士研究生. E-mail: yangsun8@yahoo.com
基金资助:
国家重点基础研究发展计划(973计划)(2006CB605207-2) National Key Basic Research and Developmet Plan (973Plan)(2006CB605207-2)

Porous Alumina Ceramics with Unidirectional Oriented Pores Fabricated by Ionotropic Process of Sodium Alginate

SUN Yang^1,2, XUE Wei-Jiang², SUN Jia-Lin¹, ZHOU Guo-Zhi¹, HUANG Yong²

(1. School of Material Science and Engineering, University of Science & Technology Beijing, Beijing 10083, China; 2. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)

Received:2015-01-22 Revised:2015-04-21 Published:2015-08-20 Online:2015-07-21
About author:SUN Yang. E-mail: yangsun8@yahoo.com

摘要/Abstract

摘要：

利用海藻酸钠的离子凝胶过程, 采用溶剂置换结合冷冻干燥的工艺, 成功制备了具有高度有序六方排列的直通孔多孔氧化铝陶瓷, 整个工艺过程及所使用的原料都是环境友好的。研究结果表明, 1500℃烧结2 h样品的孔径尺寸在200 μm左右, 且与固相含量的关系不大, 而孔壁上存在0.3 μm~0.5 μm的小孔。通过控制浆料中氧化铝的固相含量可以对材料的性能进行有效地调控, 研究表明, 随着固相含量从5wt%提高到15wt%, 材料的密度从0.87 g/cm³提高到1.16 g/cm³, 渗透率从2.57×10^-11m²下降到2.16×10^-11m², 而抗压强度从(18.9±3.2) MPa提高到(44.2±5.4) MPa, 平行孔道方向的热导率从2.1 W/(m·K)提高到3.1 W/(m·K), 而垂直孔道方向的热导率从1.3 W/(m•K)提高到1.7 W/(m·K), 并且平行孔道方向热导率的增加幅度要明显大于垂直孔道方向。

关键词: 直通孔氧化铝多孔陶瓷, 渗透率, 热导率, 离子凝胶

Abstract:

Alumina ceramic bodies with high porosity characterized by highly ordered and unidirectional oriented pores were successfully fabricated using the ionotropic process of sodium alginate by solvent exchange subsequently with freeze-drying. It is important to point out that the whole process and raw materials are eco-friendly. The average unidirectional pore size of samples sintered at 1500℃ for 2 h is 200 μm with minor porosity in the pore walls with average pore size of 0.3-0.5 μm. The properties of samples can be adjusted by controlling the solid loading in slurry. As the solid loading increasing from 5wt% to 15wt%, the density and compressive strength increased from 0.87 g/cm³ to 1.16 g/cm³ and from (18.9±3.2) MPa to (44.2±5.4) MPa, respectively with permeability decreasing from 2.57×10^-11m² to 2.16×10^-11m². In addition, with the solid loading increasing from 5wt% to 15wt%, the conductivity of the direction parallel and perpendicular to the unidirectional pores increased from 2.1 W/(m·K) to 3.1 W/(m·K) and from 1.3 W/(m·K) to 1.7 W/(m·K), respectively.

Key words: unidirectionally oriented porous alumina ceramics, permeability, thermal conductivity, ionotropic

中图分类号:

TQ174

孙阳, 薛伟江, 孙加林, 周国治, 黄勇. 海藻酸钠离子凝胶法制备直通孔氧化铝多孔陶瓷[J]. 无机材料学报, 2015, 30(8): 877-881.

SUN Yang, XUE Wei-Jiang, SUN Jia-Lin, ZHOU Guo-Zhi, HUANG Yong. Porous Alumina Ceramics with Unidirectional Oriented Pores Fabricated by Ionotropic Process of Sodium Alginate[J]. Journal of Inorganic Materials, 2015, 30(8): 877-881.

图/表 9

图1 海藻酸钠离子凝胶法工艺流程图

Fig. 1 Schematic illustrations for fabricating alumina ceramics by sodium alginate ionotropic

图2 样品中直通孔结构的形成示意图[17]

Fig. 2 Formation of unidirectional porous structures in samples[17]

图3 海藻酸钠/Al2O3凝胶的表面(a)和截面(b)的光学显微镜照片

Fig. 3 Microstructures of surface (a) and cross-section (b) of NaAlg/Al2O3 gels

图4 不同干燥方法对材料显微结构的影响

Fig. 4 Effects of drying methods on microstructures (a) Freeze-drying; (b) Evaporating in air

图5 不同Al2O3固相含量材料显微结构的SEM照片

Fig. 5 SEM images of microstructures with different solid loadings (a) 5wt%; (b) 10wt%; (c) 15wt%

图6 Al2O3多孔陶瓷孔壁显微结构SEM照片

Fig. 6 Microstructures of the pore walls of alumina porous ceramics

图7 不同固相含量样品的孔径分布

Fig. 7 Pore size distribution of samples with different solid loadings

表1 不同固相含量样品的密度、气孔率、渗透率和抗压强度

Table 1 Density, open porosity, permeability and compressive strength of samples with different solid loadings

Solid loading /wt%	Open porosity /%	Density/ (g·cm^-3)	Compressive strength /MPa	Permeability /(×10^-11, m²)
5	70.5	0.87	18.9±3.2	2.57
10	66.1	0.99	32.8±4.1	2.42
15	63.5	1.16	44.2±5.4	2.16

表2 不同固相含量样品的室温热导率

Table 2 Thermal conductivity of samples with different solid loadings

Solid loading /wt%	Thermal conductivity_∥/(W·m^-1·K^-1)	Thermal conductivity_⊥/(W·m^-1·K^-1)
5	2.08	1.36
10	2.18	1.57
15	3.03	1.78

参考文献 18

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海藻酸钠离子凝胶法制备直通孔氧化铝多孔陶瓷

Porous Alumina Ceramics with Unidirectional Oriented Pores Fabricated by Ionotropic Process of Sodium Alginate

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