Browse Prior Art Database

Zone Melting Under Pressure

IP.com Disclosure Number: IPCOM000090666D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Plaskett, TS: AUTHOR

Abstract

Alloys of groups III, III-V elements, e.g., Ga(x)In(1-x) P of uniform composition are prepared by combining zone leveling and high pressure techniques of preparing alloys. Crucible 1, containing ingot 2 of the desired alloy and flux material 3, is placed in stainless steel pressure vessel 4 on retractable stage 6. The latter is mounted on supports 7 and is moved laterally within vessel 4 by reciprocating motor 8. Single-turn RF coil 9 is established about crucible 1 to maintain a heating zone in crucible 1 such that molten zone 10 of alloy 2 is established. Vessel 4 is pressurized by the passage of an inert gas in it through tube 11. The chosen flux material 3, one that is molten at the melting point of the alloy, floats on top of the alloy and is not miscible in the molten or solid alloy.

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Zone Melting Under Pressure

Alloys of groups III, III-V elements, e.g., Ga(x)In(1-x) P of uniform composition are prepared by combining zone leveling and high pressure techniques of preparing alloys. Crucible 1, containing ingot 2 of the desired alloy and flux material 3, is placed in stainless steel pressure vessel 4 on retractable stage 6. The latter is mounted on supports 7 and is moved laterally within vessel 4 by reciprocating motor 8. Single-turn RF coil 9 is established about crucible 1 to maintain a heating zone in crucible 1 such that molten zone 10 of alloy 2 is established. Vessel 4 is pressurized by the passage of an inert gas in it through tube 11. The chosen flux material 3, one that is molten at the melting point of the alloy, floats on top of the alloy and is not miscible in the molten or solid alloy. Flux 3 serves to gather impurities from the molten alloy. In operation, alloy 2 is heated by coil 8 to provide its molten zone. Crucible 1 is rocked laterally so that the molten alloy is moved back and forth through ingot 2 to obtain an alloy of uniform composition.

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