沖縄産クチャ粘土/アルミナ混合粉体の射出成形とその焼成体の機械的性質

概要

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From the view point of a more valuable use of clay as an industrial material, clay-ceramic composite materials containing commercial alumina particles were fabricated by injection molding process. The mechanical property and quality of the mold parts were investigated by changing the ratio of alumina powder against the clay to obtain a fine composite material. The heat treatment to evaporate water(contained in the clay), the alumina content and the degreasing speed were specified by analyses of variance of the dimensional accuracy, hardness and bending strength of the parts. At the firing temperature of 1573K, the mechanical properties of the parts were improved drastically. In order to investigate the reason for the high hardness and strength obtained at 1573K, X-ray analyses of the fired parts were performed, and the added alumina was confirmed to remain unchanged. From these results, alumina powder is considered to produce a decrease in deformation of the fired parts, which is caused by partial melting of the clay and bloating of the part above a temperature of 1473K. The added alumina powder also plays the role of a reinforcement in the clay composite material.
社団法人日本セラミックス協会の論文
2000-08-01