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

抄録

Dense Al₂O₃-ZrO₂ continuous graded hollow tubes were achieved and characterized using Centrifugal Molding Technique by pressureless sintering at 1550°C (3h) in normal atmospheric conditions. There was a uniform change in the compositions of zirconia in alumina matrix along the radial direction of graded hollow tube. Electron microscopy showed that zirconia concentration was high in outer radial regions due to the centrifugal action. Agglomerations of zirconia were found in alumina matrix due to inadequate dispersion of their fine particle sizes in sub-micron level. Vickers measurements along the cross section of graded hollow tube confirmed the gradient of zirconia inclusions. This forming technique is very simple and cost effective method compared to other techniques prevailing for the fabrication of graded hollow tubes.