材料期刊网

为了提高铝碳耐火材料的性能，以电熔白刚玉（3～1、≤1 mm）为骨料，电熔白刚玉（≤0．074 mm）、鳞片石墨（≤0．15 mm）为基质，Si粉为抗氧化剂，热固性酚醛树脂为结合剂，碳纤维为添加剂，制成铝碳耐火材料，研究了碳纤维添加量对相组成、显微结构、常温物理性能、高温抗折强度和抗氧化性能的影响。结果表明：1）经220℃处理后，碳纤维与树脂结合紧密；1100℃处理后，碳纤维与树脂之间存在一定的间隙，碳纤维表面未蚀变，但其表面有少量碳化硅晶须生成；1400℃处理后，碳纤维表面发生蚀变，形成C-Si 系物质，同时其表面形成大量碳化硅晶须；2）碳纤维在不显著改变铝碳耐火材料显气孔率和体积密度的基础上，能显著提高试样经220℃和1400℃处理后的常温耐压强度和抗折强度及1400℃下的高温抗折强度；3）碳纤维的加入使铝碳耐火材料抗氧化性能下降。

Alumina-carbon specimens were prepared using white fused corundum (3 -1 and ≤1 mm)as aggregates,white fused corundum (≤0.074 mm)and flake graphite (≤0.15 mm)as matrix,Si powder as antioxidant,thermosetting phenolic resin as binder,and carbon fiber as additive.Effects of carbon fiber addition on phase compositions,microstructure,cold physical properties,HMOR and antioxidation of speci-mens were investigated.The results show that:(1 )after treated at 220 ℃,carbon fiber and resin bond closely;after treated at 1 100 ℃,the gaps are found between carbon fiber and resin,the carbon fiber is not involved in the reaction,but a few SiC whiskers exist on the surface of carbon fiber;after treated at 1 400℃,the compositions of carbon fibers convert to C-Si system substances,and lots of SiC whiskers form on the surface of the fibers;(2)the carbon fiber can greatly enhance CCS,CMOR,and HMOR at 1 400 ℃ of the specimens treated at 220 and 1 400 ℃,while slightly affect apparent porosity and bulk density;(3)the carbon fiber deteriorates oxidation resistance of alumina-carbon refractories.