アンドレアゼンモデルにより設計された粒度分布をもつAl_2O_3-ZrO_2-黒鉛耐火物の性質

概要

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The alumina-zirconia-graphate(AZG)refractory is one of the most important refractory for AISI 304 stainless steel strip casting especially used as slide gates or nozzles. The AZG refractories were obtained through baking techniques using fused Al_2O_3, partially stabilized ZrO_2 and flake graphite as the starting materials with Al, Si and SiC powders as additives. A particle size distribution was designed by Andreasen model for coarse Al_2O_3(250-1000 μm)/medium Al_2O_3(61-250 μm)/fine Al_2O_3(<61 μm)in which the contents of fine, medium and coarse Al_2O_3 powders were variables on the basis of constancy of other fine particles in the matrix. At the same particle size, the accumulative mass percent finer increases when the N-value decreases. The highest bulk density(3.3 g/cm^3)and the lowest apparent porosity(5.70%)were obtained at N-value of 0.9 with 1000 μm Al_2O_3 particle. The reheat linear change fraction about 0.4 to 0.8% indicates that these materials have an acceptable volume stability. The number of air exposure cycles of thermal shock resistance decreased gradually from 8 to 6 as N-value increased from 0.6 to 0.9. The erosion fraction tended to decrease with the N-value increasing.
社団法人日本セラミックス協会の論文
2000-08-01