Containerless processing: A route to high-purity materials

Authors

  • Makoto Nanko,

    Corresponding author
    1. Department of Materials Science and Engineering School of Mechanical Engineering Nagaoka University of Technology Nagaoka, Niigata 940-21 (Japan)
    • Department of Materials Science and Engineering School of Mechanical Engineering Nagaoka University of Technology Nagaoka, Niigata 940-21 (Japan)
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  • Prof. Kozo Ishizaki

    Corresponding author
    1. Department of Materials Science and Engineering School of Mechanical Engineering Nagaoka University of Technology Nagaoka, Niigata 940-21 (Japan)
    • Department of Materials Science and Engineering School of Mechanical Engineering Nagaoka University of Technology Nagaoka, Niigata 940-21 (Japan)
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Abstract

Minimization of contamination is particularly important in the preparation of semiconductors and special glasses. A technique is presented in which contamination from the crucible during melting is avoided by suspending the material in high pressure gas. A particular application is the production of perfect spheres. The figure shows a perfect sphere of polyethylene formed by melting a cube like that on the left.

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