Surface Modification of Flake Graphite for Carbon-containing Castables: A Technological Review
BI Yubao1,2, WANG Huifang1,2, ZHAO Wanguo1, LIANG Feng1, ZHANG Haijun1
1 The State Key Laboratory of Refractory and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081; 2 High Temperature Materials Institute, Henan University of Science and Technology, Luoyang 471003;
Abstract: The monolithic refractories have acquired wide application for its convenient installation, good monolithic structure and firing-free character. Thermal shock resistance and slag resistance of refractories can be significantly improved by the incorporation of flake graphite. However, the poor aqueous wettability and dispersibility of flake graphite make it hard to be directly applied to carbon-containing castables. Surface modification of graphite is generally regarded as one of crucial ways to solve these problems. The advances in surface modification of flake graphite are reviewed in this paper, including the formation of binary oxide coatings(e.g. Al2O3, SiO2, TiO2 and ZrO2) or ternary oxide coatings (e.g. MgAl2O4, mullite and calcium aluminate) by sol-gel method, formation of carbide coatings (e.g. SiC and TiC) at high temperature by in-situ reaction method,and improving aqueous wettability of the graphite by using appropriate surfactants. The effect of modified graphite on the properties of carbon containing castables and the effect of surface modification methods and preparation processing factors on the coating as well as coating formation mechanism are summarized. Moreover, potential research directions of carbon containing castables are also prospected from the perspectives of improving the bonding between coating and graphite, and developing advanced heating technology and efficient surfactants for preparing of surface-modified graphite etc.
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