Unique microstructure and thermal insulation property of a novel waste-utilized foam ceramic

doi:10.1016/j.jmst.2020.03.017

材料科学与技术 ›› 2020, Vol. 48 ›› Issue (0): 175-179.DOI: 10.1016/j.jmst.2020.03.017

收稿日期:2019-12-06 接受日期:2020-03-09 出版日期:2020-07-01 发布日期:2020-07-13

Unique microstructure and thermal insulation property of a novel waste-utilized foam ceramic

F.H. Kuang^a, S.M. Wang^a^,^*(), C. Gao^c, H.B. Zhang^b, R.K. Ren^b, J.L. Ren^b, J. Tong^b, Y.M. Liu^a, J. Liu^a

^a Department of Materials Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China
^b China Building Materials Academy, Beijing 100024, China
^c China Institute for Radiation Protection, Taiyuan 030006, China

Received:2019-12-06 Accepted:2020-03-09 Online:2020-07-01 Published:2020-07-13
Contact: S.M. Wang

摘要/Abstract

Abstract:

A characteristic CaO-Al₂O₃-SiO₂ based foam ceramic was prepared by melt-foaming with solid wastes as main raw materials. The similarity to sandwich hole wall microstructure of this novel thermal insulating material was presented and the relationships between this unique microstructure and porosity, density, thermal conductivity and strength were discussed. Comparing the measured and theoretical values with that of the traditional foam ceramic, it can be found that, for the matching of fine skeleton with hole wall, this original sandwich structure can reduce thermal conductivity and increase flexural strength effectively.

Key words: Foam ceramic, Density, Porosity, Strength, Thermal conductivity, Sandwich structure

. [J]. 材料科学与技术, 2020, 48(0): 175-179.

F.H. Kuang, S.M. Wang, C. Gao, H.B. Zhang, R.K. Ren, J.L. Ren, J. Tong, Y.M. Liu, J. Liu. Unique microstructure and thermal insulation property of a novel waste-utilized foam ceramic[J]. J. Mater. Sci. Technol., 2020, 48(0): 175-179.

图/表 9

Fig. 1. Flow chart of the process of making foam ceramic.

Fig. 2. Schematic illustration of the adjacent bubbles change process.

Fig. 3. SEM micrograph for foam ceramic.

Fig. 4. SEM of foam ceramic at different temperatures: (a) 1100 ℃, (b) 1160 ℃, and (c) 1200 ℃.

Fig. 5. SEM micrographs of foam ceramic with different holding time: (a) 0.5 h, (b) 1 h, (c) 2 h.

Fig. 6. Porosity of CaO-Al2O3-SiO2 foam ceramic with different SiC content.

Fig. 7. Flexural strength and porosity of CaO-Al2O3-SiO2 foam ceramic with different densities.

Table 1 Calculated thermal conductivity and tested thermal conductivity of CaO-Al2O3-SiO2 foam ceramic.

Porosity (%)	Calculated thermal conductivity (w/m·K)	Tested thermal conductivity (w/m·K)
60	0.52	0.67
68	0.41	0.45
78	0.27	0.26
85	0.18	0.14
90	0.12	0.08
92	0.10	0.07
94	0.07	0.05

Fig. 8. Sandwich structure of hole wall of the foam ceramic.

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Unique microstructure and thermal insulation property of a novel waste-utilized foam ceramic

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