摘要
为实现二次铝灰固废资源的高值化利用,本研究将二次铝灰作为α-Al_(2)O_(3)的替代材料引入低碳Al_(2)O_(3)-C耐火材料中,以板状刚玉、鳞片石墨、铝粉和硅粉为主要原料,制备了低碳Al_(2)O_(3)-C耐火材料,探讨二次铝灰替代α-Al_(2)O_(3)后对材料显微结构、抗氧化性能、抗侵蚀性能和抗热震性能的影响。结果表明,经1400℃埋炭热处理后,二次铝灰替代α-Al_(2)O_(3)后会导致材料体积密度降低,显气孔率升高,但同时促进了材料内部SiC晶须网络结构的形成,优化了材料的显微结构。在氧化试验中,与使用α-Al_(2)O_(3)作添加剂相比,添加二次铝灰更有利于莫来石相的生成。添加二次铝灰后,高温下生成的适量液相可有效填充材料表面氧化层气孔,从而改善材料的抗氧化性能、抗侵蚀性能和抗热震性能,其中氧化指数由88%降低至52%,侵蚀指数也明显降低,残余强度保持率由87%提升至97%。
To achieve the high-value utilization of aluminum dross solid waste resources,this study introduced aluminum dross as a substitute material forα-Al_(2)O_(3)in low carbon Al_(2)O_(3)-C refractory materials.Using tabular corundum,flake graphite,aluminum powder,and silicon powder as the primary raw materials,low carbon Al_(2)O_(3)-C refractory materials were fabricated.The effects of substitutingα-Al_(2)O_(3)with aluminum dross on the microstructure,oxidation resistance,erosion resistance,and thermal shock resistance of the materials were investigated.The results indicate that after carbon-buried heat treatment at 1400℃,the substitution ofα-Al_(2)O_(3)with aluminum dross leads to a reduction in bulk density and an increase in apparent porosity.However,it also promotes the formation of a SiC whisker network structure inside the material,thereby enhancing the microstructure of the material.In oxidation experiments,compared to the use ofα-Al_(2)O_(3)as an additive,adding aluminum dross is more conducive to the formation of the mullite phase.After adding aluminium dross,the appropriate amount of liquid phase generated at high temperature can effectively fill the pores of the oxide layer on the material surface,thereby improving the material s oxidation resistance,erosion resistance,and thermal shock resistance.Specifically,the oxidation index decreases from 88%to 52%,the corrosion index experiences a marked reduction,and the residual strength ratio increases from 87%to 97%.
作者
乔畅通
余超
邓承继
王萱
丁军
刘正龙
祝洪喜
QIAO Changtong;YU Chao;DENG Chengji;WANG Xuan;DING Jun;LIU Zhenglong;ZHU Hongxi(State Key Laboratory of Advanced Refractories,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《硅酸盐通报》
北大核心
2025年第5期1878-1887,共10页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金联合基金项目(U20A20239)
国家自然科学基金(52402034)。
