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1. (WO2017018397) SAPPHIRE SINGLE-CRYSTAL RIBBON AND METHOD FOR PRODUCING SAME

Pub. No.:    WO/2017/018397    International Application No.:    PCT/JP2016/071788
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Wed Jul 27 01:59:59 CEST 2016
IPC: C30B 29/20
C30B 15/34
Applicants: NAMIKI SEIMITSU HOUSEKI KABUSHIKIKAISHA
並木精密宝石株式会社
Inventors: KOTAKI Toshiro
古滝 敏郎
SATO Tsugio
佐藤 次男
TAKAHASHI Masayuki
高橋 正幸
Title: SAPPHIRE SINGLE-CRYSTAL RIBBON AND METHOD FOR PRODUCING SAME
Abstract:
[Problem] To provide: a flexible sapphire single-crystal ribbon which is resistant to tensile stress and for which cracking or breaking is prevented; and a method for producing same. [Solution] Dies that have a slit and are arranged so as to have parallel width directions are accommodated in a crucible. An aluminum oxide raw material is fed into the crucible and heated. The aluminum oxide raw material is melted in the crucible to prepare an aluminum oxide melt. Via the slits, an aluminum oxide melt reservoir is formed in a slit upper section. A seed crystal is brought into contact with the aluminum oxide melt at the slit upper part, and the seed crystal is drawn up, to thereby grow a sapphire single-crystal ribbon of a flexible as-grown single crystal having desired principal surface and longitudinal direction dimensions. This causes the surface of the grown and formed sapphire single-crystal ribbon to be free of micro-cracks.