Pressure container for crystal production

Patent metadata

Field	Value
Publication number	US-11746439-B2
Application number	US-201816499435-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Apr 7, 2017
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

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.

First claim

The invention claimed is:

1. A pressure container for crystal production containing:
a pressure container main body having an opening; and
a cover configured to close the opening of the pressure container main body,
wherein the pressure container is configured to produce a crystal using ammonia in a supercritical state or a subcritical state as a solvent, a raw material, a mineralizer, and a seed crystal inside the container, and
wherein Ag is present at least on an entire surface of an inner surface of the pressure container configured to be in contact with the solvent, the entire surface where the Ag is present including at least:
an inner surface of the pressure container main body comprising a Ag liner;
an inner surface of a portion comprising a Ag plating layer, the portion being located at an upper end edge of the pressure container main body and being not covered with the Ag liner; and
an inner surface of the cover.

2. The pressure container for crystal production according to claim 1 ,
wherein the crystal is nitride crystal.

3. The pressure container for crystal production according to claim 1 ,
wherein the mineralizer is a fluorine-based mineralizer and does not contain a halogen atom other than fluorine.

4. The pressure container for crystal production according to claim 1 ,
wherein the pressure container main body has a cylindrical shape, and the Ag is disposed as the Ag liner having a bottomed cylindrical shape on the inner surface of the pressure container main body.

5. The pressure container for crystal production according to claim 1 , further comprising:
a gasket disposed in a gap between the pressure container main body and the cover.

6. The pressure container for crystal production according to claim 1 ,
wherein the pressure container main body is formed of a pressure container first main body member and a pressure container second main body member,
wherein the pressure container second main body member is located on a part or all of an inner surface side of the pressure container first main body member, and
wherein the pressure container second main body member is composed of a material that is more excellent in corrosion resistance than the pressure container first main body member.

7. The pressure container for crystal production according to claim 6 ,
wherein the Ag is disposed by the Ag liner, a Ag welding, and a Ag plating,
wherein the pressure container second main body member is located on an outer periphery side of the Ag welding and the Ag plating, and
wherein the pressure container first main body member is located on an outer peripheral side of the pressure container second main body member.

8. The pressure container for crystal production according to claim 1 ,
wherein the cover is formed of a first cover member and a second cover member,
wherein the second cover member is located on a part or all of an inner surface side of the first cover member, and
wherein the second cover member is composed of a material that is more excellent in corrosion resistance than the first cover member.

9. The pressure container for crystal production according to claim 8 ,
wherein the Ag is disposed by the Ag liner, a Ag welding, and a Ag plating,
wherein the second cover member is located on an outer periphery side of the Ag welding and the Ag plating, and
wherein the first cover member is located on an outer peripheral side of the second cover member.

10. The pressure container for crystal production according to claim 1 ,
wherein the pressure container main body and the cover are formed of a Ni-based alloy, an iron alloy, a cobalt-based alloy, or alloys combining thereof.

11. The pressure container for crystal production according to claim 1 ,
wherein the Ag is disposed by the Ag liner, a Ag welding, or a Ag plating, or a combination of two or more thereof.

12. The pressure container for crystal production according to claim 1 ,
wherein the Ag is disposed by the Ag liner, a Ag welding, or a Ag plating, or a combination of two or more thereof, and
wherein the Ag liner is installed up to a mouth part of the pressure container main body having an opening and has a thickness of from 0.5 mm to 20 mm.

13. The pressure container for crystal production according to claim 1 ,
wherein the Ag is disposed by the Ag liner, a Ag welding, and a Ag plating, and
wherein the Ag welding joins an upper portion of an opening of the Ag liner and the pressure container main body to seal a gap between the Ag liner and the pressure container main body.

14. The pressure container for crystal production according to claim 1 ,
wherein the Ag is disposed by the Ag liner, a Ag welding, and a Ag plating,
wherein the Ag plating is performed on:
the inner surface of the pressure container main body except for the Ag liner and a Ag welded portion;
the inner surface of the cover; and
an inner peripheral surface of a gasket, and
wherein the Ag plating layer has a thickness of from 10 μm to 1000 μm.

15. The pressure container for crystal production according to claim 1 ,
wherein the inner surface of the cover comprises the Ag plating layer.

16. A pressure container for crystal production containing:
a pressure container main body having an opening; and
a cover configured to close the opening of the pressure container main body,
wherein the pressure container is configured to produce a crystal using ammonia in a supercritical state or a subcritical state as a solvent, a raw material, a mineralizer, and a seed crystal inside the container, and
wherein the pressure container main body is formed of a pressure container first main body member and a pressure container second main body member, and
wherein Ag is present at least on an entire surface of an inner surface of the pressure container configured to be in contact with the solvent, the entire surface where the Ag is present including at least:
an inner surface of the pressure container second main body member;
an inner surface of the pressure container first main body member comprising a Ag liner; and
an inner surface of the cover.

17. The pressure container for crystal production according to claim 16 ,
wherein the second main body member is located at an upper end edge of the inner peripheral surface of the first main body member.

18. The pressure container for crystal production according to claim 16 ,
wherein the second main body member is disposed on only a part of the inner surface of the first main body member.

Assignees

• The Japan Steelworks Ltd
• Univ Tohoku
• Japan Steel Works M&E Inc

Inventors

• KURIMOTO Kouhei
• Bao Quanxi
• Ueda Mutsuo
• Sasagawa Yuji
• Morimoto Masaya
• Ishiguro Toru
• Chichibu Shigefusa

Classifications

• C30B35/002 Primary

  Crucibles or containers · CPC title

• C30B7/10

  by application of pressure, e.g. hydrothermal processes · CPC title

• C30B29/38

  Nitrides · CPC title

• C30B29/406 Primary

  Gallium nitride · CPC title

• C30B7/105 Primary

  using ammonia as solvent, i.e. ammonothermal processes · CPC title