新規な作製法による円筒型アルミナ/ジルコニア傾斜材料(<特集>セラミックスインテグレーション)

概要

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A novel technique, named centrifugal molding technique (CMT) has been introduced for the fabrication of continuous graded hollow tubes by pressureless sintering. Alcohol based slurries containing alumina and zirconia with 27 vol% of solid were trialed using this new forming technique. Sintered graded hollow tubes had 95.3% of relative densities having alumina rich regions in inner surface and zirconia rich regions in the outer surface. Observed microstructures showed that zirconia phases had a uniform gradient along the radial direction of graded hollow tubes. Poor dispersion of sub-micron sized secondary phase zirconia particles tended to form agglomerations in alumina matrix. Compositional analysis revealed a smooth transition of secondary zirconia phases through the thickness of sintered specimens. Vickers hardness measurements in equal intervals of distance along radial direction proved the gradient of zirconia inclusions. The CMT is simple and uncomplicated when compared to other previous techniques used for fabricating continuous graded hollow tubes.
社団法人日本セラミックス協会の論文
2002-05-01