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Effect of modified graphite on properties of Al2O3-SiC-C castables for BF trough
Author(s): 
Pages: 362-364
Year: Issue:  5
Journal: Refractories

Keyword:  alumina-silicon carbide-carbonsilane coupling agentmodified graphitecastables for BF trough;
Abstract: 为了解决鳞片石墨因密度小、润湿性差和分散困难而难以在浇注料中使用的问题,首先采用硅烷偶联剂KH-560对≤0.178和≤0.074 mm的鳞片石墨分别进行改性处理,得到两种粒度的改性石墨;然后在传统Al2O3-SiC-C质铁沟浇注料配方(w):电熔致密刚玉62%、SiC粉24%、α-Al2O3微粉5%、纯铝酸钙水泥4%、SiO2微粉3%、球状沥青(≤1 mm)2%的基础上,分别用0.5%(w)的改性前后的石墨等量取代球状沥青,以研究KH-560硅烷偶联剂改性鳞片石墨对Al2O3-SiC-C铁沟浇注料性能的影响.结果表明:与原石墨相比,改性后石墨的分散性明显改善,浇注料的需水量大幅降低,且加入≤0.178 mm改性石墨的试样分散效果较好;含石墨试样的常温物理性能均有所下降,但加入≤0.178 mm改性石墨的试样强度和体积密度都明显高于加入其他石墨的,仅略低于无石墨的;加入石墨的试样抗渣性能明显得到提高,且加入≤0.178 mm改性石墨试样的抗渣性能最佳.综合考虑浇注料的各项性能,认为经硅烷偶联剂改性的鳞片石墨可部分取代球状沥青,且最佳粒度为≤0.178 mm.
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