アルミナ-ジルコニア-黒鉛(AZG)耐火物の性質に及ぼすプロセス・パラメーターの影響 (第1報) : 成形圧力及び焼成温度

概要

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Alumina-zirconia-graphite (AZG) refractorios were obtained through a baking technique using fused Al_2O_3, partially stabilized ZrO_2 and flake graphite as the starting materials with Al, Si, and SiC powder additives. A particle size distribution was designed by the Furnas model for coarse Al_2O_3 (500-1000μm/medium Al_2O_3 (61-125 μm/fine Al_2O_3 (<44μm, in which the contents of coarse, medium and fine Al_2O_3 powders were varied with a constant amount of fine particles in the matrix. The bulk density increased from 3.05 to 3.29 g・cm^3 for the sample with a mass ratio of (coarse Al_2O_3) / (medium Al_2O_3) = 2.14 the forming pressure being from 100 to 150 MPa. However, when the forming pressure increased from 150 to 170 MPa, the bulk density gradually decreased from 3.29 to 3.26 g・cm^3. The lowest porosity (5.1%) was achieved by compacting the powders with a mass ratio of 2.14 at 150 MPa. The average pore size readily decreased from 5.3-5.8 to 3.l-3.9 μm as the forming pressure increased from 100 to 150 MPa. Besides, the average pore size gradually decreased from 3.1-3.9 to 3.0-3.7μm when the forming pressure increased from 150 to 170 MPa. The bulk density increased with increasing baking temperature and attained an inflection value at 200℃ above which it gradually increased up to 240℃.
社団法人日本セラミックス協会の論文
2001-07-01