SINGLE CRYSTAL-PULLING DEVICE

• Main Authors: KABURARUMA TATSUYA, MAKIYAMA KATSUTO, KUBO TAKAYUKI
• Format: Patent
• Language: English
• Published: 25.09.2002
• Edition: 7
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

PROBLEM TO BE SOLVED: To impart a degree of freedom suitable for recovering a quartz crucible to a divided carbon crucible, and to prevent damaging of the quartz crucible accompanying the degree of freedom. SOLUTION: A carbon crucible 10 is divided into two or more parts by parting lines 14 in a radial direction. An aperture 11a is established at the center of the bottom of the carbon crucible 10. A protruding part 21 which fits the aperture 11a is established on the crucible-carrying surface of a crucible- receiving plate 20. The inside diameter d2 of the aperture 11a is from 0.04 to 0.9 times as large as the inside diameter d1 of the straight body part of the carbon crucible 10, and the outside diameter D2 of the crucible-receiving plate 20 is >=0.5 times as large as the outside diameter D1 of the straight body part of the carbon crucible 10. The minimum wall thickness of the crucible- receiving plate 20 is >=15 mm.