GB999226A - Processing refractory metals - Google Patents

Processing refractory metals

Info

Publication number
GB999226A
GB999226A GB47858/63A GB4785863A GB999226A GB 999226 A GB999226 A GB 999226A GB 47858/63 A GB47858/63 A GB 47858/63A GB 4785863 A GB4785863 A GB 4785863A GB 999226 A GB999226 A GB 999226A
Authority
GB
United Kingdom
Prior art keywords
zone
rod
vacuum
tungsten
dec
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB47858/63A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB999226A publication Critical patent/GB999226A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
    • C30B13/16—Heating of the molten zone
    • C30B13/22—Heating of the molten zone by irradiation or electric discharge

Abstract

999,226. Zone-melting. WESTINGHOUSE ELECTRIC CORPORATION. Dec. 4, 1963 [Dec. 6, 1962], No. 47858/63. Heading B1S A rod produced from metal powder by pressure compacting or slip-casting is zone-melted by electron bombardment in a vacuum. Incipient fusion may be effected by preheating, e.g. for 30 minutes in hydrogen or a vacuum, or by the first pass of the molten zone. The rod may be horizontal or vertical. The rate of zonemelting may be 5 mm./minute. The molten zone may be passed in both directions to effect zone-levelling of an alloy. Metals specified are tungsten, molybdenum, niobium, tantalum, rhenium, osmium, ruthenium, platinum, yttrium, vanadium, chromium, and iron. Tungsten powder may have been compacted at a pressure of 20,000 p.s.i. to produce a bulk density which is 60% of the theoretical. As shown, a rod 28, which acts as an anode, is passed to and fro through a circular tungsten cathode 32 in a vacuum vessel 10. Specification 826,132 is referred to.
GB47858/63A 1962-12-06 1963-12-04 Processing refractory metals Expired GB999226A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US242781A US3218154A (en) 1962-12-06 1962-12-06 Metal processing method

Publications (1)

Publication Number Publication Date
GB999226A true GB999226A (en) 1965-07-21

Family

ID=22916159

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47858/63A Expired GB999226A (en) 1962-12-06 1963-12-04 Processing refractory metals

Country Status (4)

Country Link
US (1) US3218154A (en)
CH (1) CH434585A (en)
GB (1) GB999226A (en)
NL (1) NL301308A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3382114A (en) * 1964-01-07 1968-05-07 Philips Corp Method of manufacturing semiconductor plate using molten zone on powder support
US3338706A (en) * 1965-03-11 1967-08-29 Westinghouse Electric Corp Metal processing method and resulting product
US3425826A (en) * 1966-03-21 1969-02-04 Atomic Energy Commission Purification of vanadium and columbium (niobium)
US3372024A (en) * 1966-11-10 1968-03-05 Army Usa Zone refinement of liquid-phase sintered tungsten alloys

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743199A (en) * 1955-03-30 1956-04-24 Westinghouse Electric Corp Process of zone refining an elongated body of metal
DE1051013B (en) * 1955-06-17 1959-02-19 Western Electric Company, Incorporated, New York, N. Y. (V. St. A.) Method for keeping liquids, in particular melts, free-floating
US2809905A (en) * 1955-12-20 1957-10-15 Nat Res Dev Melting and refining metals
US3163523A (en) * 1962-06-27 1964-12-29 Sylvania Electric Prod Method of purifying germanium

Also Published As

Publication number Publication date
NL301308A (en)
CH434585A (en) 1967-04-30
US3218154A (en) 1965-11-16

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