Mitsubishi Chemical Corporation

The Japan Steel Works, Ltd.

Furuya Metal Co., Ltd.

Tohoku University

Japan Steel Works M&e, Inc.

Yuji Sasagawa

Yoshihiko Yamamura

Keiichiro Matsushita

Osamu Wakao

Shigeharu Akatsuka

Shigefusa Chichibu

Kouhei Kurimoto

Toru Ishiguro

Quanxi Bao

Mutsuo Ueda

Masaya Morimoto

A pressure container for crystal production having excellent corrosion-resistance is provided. This pressure container produces crystals within the container using a seed crystal, a mineralizer, a raw material, and ammonia in a supercritical state or a subcritical state as a solvent. The pressure container has Ag present over the entire surface of at least the inner surface thereof in contact with the solvent. The Ag can be disposed by one or a combination of two or more among, for instance, Ag lining, Ag welding, and Ag plating. The mineralizer is preferably a fluorine mineralizer containing no halogen atoms other than fluorine.

Pressure container for crystal production

An object of the present invention is to manufacture single crystals of high quality on an industrial production scale by preventing impurities from being mixed in single crystals when the single crystals are produced by the solvothermal method. A pressure vessel body, in which a supercritical state is maintained, is made of heat resistant alloy, a portion of the pressure vessel body is open, a corrosion-resistant mechanical liningis provided on an inner face of the pressure vessel and on an entire outer circumferential edge of the opening, and the opening is sealed by an airtight mating face formed out of a corrosion-resistant mechanical lining, which is formed on the outer circumferential edge of the opening, and by an airtight mating face of the corrosion-resistant mechanical lining coveron an inner face of the coverthrough a corrosion-resistant gasket member. Since the pressure vessel body and the inner face of the cover are covered with the corrosion-resistant mechanical lining, corrosion can be prevented. The corrosion-resistant mechanical lining ensures the sealing property on the airtight mating face between the pressure vessel body and the cover and further effectively prevents corrosion in the airtight sealing portion and it becomes possible to repeatedly open and close the airtight sealing portion.

Method of manufacturing a pressure vessel for growing single crystals

Pressure vessel for growing single crystals

Growing community of inventors

Muroran, Japan

Yuji Sasagawa