カップリング剤で処理した高純度アルミナ粉末の圧縮及び焼結挙動

概要

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Compaction and sintering behavior of a high purity alumina powder (>99.99%) treated with aluminate (A), silane (S) and titanate (T) coupling agents were investigated. The surface treatment increased the green density of pressed-bodies, the effectiveness of the coupling agents on the density increase being S (57.2%)>T (56.4%)>A (53.9%)>non-treated (51.4%) at 2 wt% addition. Microstructure development after firing for 2h at 1600℃ was considerably dependent on the types of metals contained in coupling agents. Alumina treated with 2 wt% of aluminate (Al) exhibited uniform and fine grains similar to the non-treated system. Grain growth and densification were enhanced in the alumina treated with 2 wt% of titanate (Ti) and columnar grains were formed in the alumina treated with 2 wt% of silane (Si). Both bending strength and fracture toughness decreased by the addition of coupling agents. Intragranular fracture was observed in the alumina treated with 2 wt% of silane although intergranular fracture was prominent in other systems.
社団法人日本セラミックス協会の論文
1993-05-01