湿式成形法によるアルミナ系セラミックスの焼結特性

概要

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In order to apply to a cutting tool, the sintering properties of the compacted alumina ceramics using the wet-shaping process were investigated. The used ceramics were the reactive alumina, the mixed 12mass% of the partially stabilized zirconia with the reactive alumina (alumina + zirconia) and the alumina with a purity of 99.99% (high purity alumina), and sintered at 1573-1873K for 5.4-21.6ks in air. The relative density of the sintered reactive alumin and alumina + zirconia were peaked at 1823K, and stayed constant more than 1823K. In high purity alumina, it was peaked at 1873K and stayed constant more than 1873K similarly. However, the Vickers hardness, fracture toughness and 4-point bending strength of sintered reactive alumina and high purity alumina were decreased at more than peak temperature, respectively. At this time, the grain size of both sintered ceramics was developed more than 2μm. From the result, it was shown that the grain size must also be small although it was necessary to make high density for mechanical properties.
近畿大学の論文
2003-12-20