硫酸アルミニウムとジルコニウムイソプロポキシドから調製したアルミナ-ジルコニア複合粉体の焼結(高圧力小特集)

概要

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Amorphous Al_2O_3-ZrO_2 composite powders with 5〜3 mol% ZrO_2 have been prepared by adding aqueous ammonia to the mixed solution of aqueous aluminum sulfate and zirconium alkoxide containing 2-propanol. Simultaneous crystallization of γ-Al_2O_3 and t-ZrO_2 occurs at 870°〜980℃. The γ-Al_2O_3 transforms to α-Al_2O_3 at 1160°〜1220℃. Hot isostatic pressing has been performed for 1h at 1400℃ under 196 MPa using α-Al_2O_3-t-ZrO_2 composite powders. Dense ZrO_2-toughened Al_2O_3(ZTA) ceramics with homogeneous-dispersed ZrO_2, particles shows excellent mechanical properties. The toughening mechanism is discussed. The microstructures and t/m ratios are examined, with emphasis on the relation between strength and fracture toughness.
社団法人日本材料学会の論文
1994-09-15