Hydrothermal crystallization vessels

Details Hydrothermal crystallization vessels Hydrothermal crystallization vessels

1995-01-20

1996-07-09

Kunemund, Robert

Single-crystal, oriented-crystal, and epitaxy growth processes;

Apparatus

For crystallization from liquid or supercritical state

117 71, 117 72, C30B 710

Patent

active

055334652

ABSTRACT:
A seal apparatus is disclosed for sealing an outlet of a pressurized chamber from fluid loss from the chamber and contamination to the chamber. The apparatus includes certain combinations of (a) a chamber outlet structure; (b) a removable cover; (c) means for reversibly connecting the cover to the chamber outlet structure; and (d) a compressible self-energizing ring having a surface which consists essentially of a material selected from the group consisting of noble metals, noble metal alloys and polytetrafluoroethylene, which has a hardness selected to substantially avoid deformation when the cover is sealed to the chamber outlet structure.
Also disclosed are certain pressure vessels for hydrothermal crystal growth using a crystal growth media, which comprise (a) a vessel base and (b) a removable vessel cover. The vessels include (i) certain said combinations employing a compressible self-energizing ring with a surface resistant to corrosion by the crystal growth media and a hardness lower than the hardness of the seal surfaces of the base and cover; and/or (ii) (in an aspect of this invention especially suited for the growth of crystals of the formula MTiOXO.sub.4 wherein M is selected from the group consisting of K, Rb, Tl, NH.sub.4 and mixtures thereof and X is selected from the group consisting of P, As and mixtures thereof) vessel bodies of a nickel alloy essentially free of titanium.

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"The EnerRing Seal Line", Advanced Products Company Brochure, Advanced Products Company, North Haven, CT 06473.
Ballman, A. A. et al, "Hydrothermal Growth", The Art and Science of Growing Crystals, J. J. Gilman, Ed., Wiley & Sons, New York.

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