高濃度アルミナスラリーの鋳込み成形に及ぼすセッコウ型特性の影響

概要

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Effect of suction pressure p_<cap> and permeability K_m of plaster mold on the slip casting of a high concentrated alumina slurry of 58.8 vol% was investigated. Three cylindrical plaster molds were fabricated from the slurries having water-to-plaster mass ratios of 0.55, 0.63 and 1, and designated as the 55% -mold, 63% -mold and 100% -mold. The 55%, 63% and 100% -molds were characterized by low p_<cap> and low K_m, high p_<cap> and low K_m, and lowp_<cap> and high K_m, respectively. Casting rate at an early stage increased with increasing p_<cap> x K_m or K_m, and average bulk density of cast body increased with increasing p_<cap>. Local green density increased from the center toward the wall of mold because of consolidation of the compressible cake. High p_<cap> x K_m and low p_<cap> enhanced percolation effect, and resulted in remarkable segregation of fine particles near the mold wall. Green body with a high relative density of 66.3% and a homogeneous density distribution was obtained from the 63%-mold showing high p_<cap> and low K_m.
社団法人日本セラミックス協会の論文
1996-06-01