碳纤维热氧化对其在铝碳耐火材料中结构演变与使用效果的影响  

Effect of Thermal Oxidation of Carbon Fibers on Their Structural Evolution and Using Effects in Al_(2)O_(3)–C Refractories

作　　者：王玉龙[1] 王周福[1] 王玺堂[1] 刘浩[1] 马妍[1] 董云洁 WANG Yulong;WANG Zhoufu;WANG Xitang;LIU Hao;MA Yan;Dong Yunjie(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《硅酸盐学报》2024年第6期2107-2117,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(U21A2057;U20A20239);湖北省重点研发计划(2022BAA032)。

摘　　要：以白刚玉和活性氧化铝粉为主要原料、鳞片石墨与炭黑为碳源、碳化硼与单质硅粉为添加剂、短切碳纤维为增强体制备了铝碳耐火材料。利用场发射扫描电子显微镜研究了材料中碳纤维与单质硅反应后发生的结构演变。结合三点弯曲法和单轴压缩法研究了材料不同温度下的力学性能,采用水淬冷法研究了材料的抗热震性能,采用单边切口梁法研究了材料的抗断裂性能。结果表明:热氧化可以有效对碳纤维表面进行改性,从而影响到碳纤维的结构演变与使用性能;合适的热氧化处理可使碳纤维在铝碳耐火材料中发挥显著的增强作用,加入500℃热氧化的碳纤维后,铝碳耐火材料的常温抗折强度、常温耐压强度和高温抗折强度相比于对照材料分别提高了28.2%、22.4%和87.2%(材料1 400℃热处理后)。另外,引入热氧化碳纤维也能对铝碳耐火材料的抗热震性能与抗断裂性能产生影响。Introduction Al_(2)O_(3)–C refractories are one of the important categories of refractory materials in steel smelting.Improving their service life has a great application value.The service life of Al_(2)O_(3)–C refractories is closely related to their mechanical properties.Therefore,an effective approach to improve the mechanical properties of Al_(2)O_(3)–C refractories and further enhance their service life is to introduce a structural reinforcement such as carbon fibers.However,using commercial carbon fibers directly as a structural reinforcement cannot bind with other components of the material tightly at various temperatures due to its smooth surface and low reactivity,thus restricting the reinforcing effect of carbon fibers.Therefore,surface treatment such as thermal oxidation on carbon fibers is an effective way to improve the reinforcement effect of carbon fibers and improve the mechanical properties of carbon fibers reinforced Al_(2)O_(3)–C refractories.In this paper,short carbon fibers were treated by a thermal oxidation method,and Al_(2)O_(3)–C refractories were then prepared using the treated carbon fibers as a reinforcement.The structural evolution of short carbon fibers with different degrees of oxidation in Al_(2)O_(3)–C refractories,as well as the effect of adding thermal oxidation short carbon fibers on the mechanical and thermal shock resistance properties of Al_(2)O_(3)–C refractories were investigated.Methods White corundum,active alumina powder,silicon powder,boron carbide,flake graphite,nano carbon black,and short carbon fiber were used as raw materials,and thermosetting phenolic resin was used as a binder.In addition,some commercial carbon fibers were heated in air at 400,500℃,and 600℃for 0.5 h to prepare thermal oxidation carbon fibers in order to investigate the effect of thermal oxidation treatment of carbon fibers on their structural evolution and service performance in Al_(2)O_(3)-C refractories.The Al_(2)O_(3)–C samples without carbon fibers and with untreated carbo

关 键 词：热氧化 短切碳纤维 铝碳耐火材料 增强作用 抗热震性 

分 类 号：TQ175.71[化学工程—硅酸盐工业]