Effect of Silica Additive on the Formation of Lotus-Type Porous Alumina under Unidirectional Solidification

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  • Ueno Shunkichi
    The Institute of Scientific and Industrial Research, Osaka University
  • Lin Li Ming
    The Institute of Scientific and Industrial Research, Osaka University
  • Hyun Soong Keun
    The Institute of Scientific and Industrial Research, Osaka University
  • Nakajima Hideo
    The Institute of Scientific and Industrial Research, Osaka University

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Abstract

Effect of silica additive on the formation of lotus-type porous alumina on the unidirectional solidification was examined. Lotus-type porous alumina with 44% porosity was formed by unidirectional solidification using the optical floating zone method under a hydrogen atmosphere when low purity alumina was used as the feed rod. However, non-porous alumina was prepared in argon atmosphere. The formed pores possessed a drop-like shape and were elongated along the solidification direction in porous alumina. Gas bubbles evolved in the molten zone and was trapped by the solid/liquid interface during the unidirectional solidification. On the other hand, lotus-type porous alumina could not be obtained when high purity alumina was used as the feed rod. The porosity of the solidified porous alumina increased with increasing silica contents in the feed rods.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 47 (9), 2167-2171, 2006

    The Japan Institute of Metals and Materials

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