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Preparation, microstructure, and compressive strength of carbon foams derived from sucrose and kaolinite

Published online by Cambridge University Press:  14 March 2014

Haipeng Ji
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Zhaohui Huang*
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Xiaowen Wu
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Juntong Huang*
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Kai Chen
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Minghao Fang
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Yan’gai Liu
Affiliation:
School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
*
a)Address all correspondence to this author. e-mail: huang118@cugb.edu.cn
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Abstract

Carbon foams were successfully fabricated from sucrose and kaolinite clay by thermo-foaming method using aluminum nitrate as the blowing agent. The phases, pore structure, and compressive strength were characterized by x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and mechanical test, respectively. The foams had porous structure with spherical open cells of size in the range of 400–1000 μm, dense struts, and interconnected voids of size in the range of 100–600 μm. Both smooth and coarse types of voids are observed. Mullite and cristobalite, products of the clay mineral, are concentrated more on the strut and cell walls. The ultimate compressive strength evolution is found to be in correlation with the amount of voids and the microcracking in the carbon foams.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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