C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
148/1.2
C30B 11/00 (2006.01) C30B 15/10 (2006.01) C30B 35/00 (2006.01)
Patent
CA 2008024
ABSTRACT A single crystal is produced from the melt of a starting material by solidification. The process makes use of a triple-walled crucible composed of an outer cylinder made of a material selected from high-melting- point metals and alloys having a melting point of at least 1,500°C, an inner cylinder made of at least one material selected from high-melting-point ceramic materials and carbon materials such as graphite, pyrolytic graphite and vitreous carbon and an intermediate cylinder made of quartz glass. The starting material is charged in the in- ner cylinder. The inner cylinder with the starting material charged therein is inserted in the intermediate cylinder. The intermediate cylinder with the inner cylinder hermetically inserted therein is inserted in the outer cylinder. The outer cylinder is welded to hermeti- cally enclose the intermediate and inner cylinders there- in. The thus-assembled crucible is heated to fuse the starting material, followed by crystal growth.
Fetherstonhaugh & Co.
Mitsui Mining Co. Ltd.
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