FR2232361A1 - Powder for crystal prodn by the Verneuil process - obtd. by melting particulate matl. in furnace - Google Patents

Powder for crystal prodn by the Verneuil process - obtd. by melting particulate matl. in furnace

Info

Publication number
FR2232361A1
FR2232361A1 FR7320349A FR7320349A FR2232361A1 FR 2232361 A1 FR2232361 A1 FR 2232361A1 FR 7320349 A FR7320349 A FR 7320349A FR 7320349 A FR7320349 A FR 7320349A FR 2232361 A1 FR2232361 A1 FR 2232361A1
Authority
FR
France
Prior art keywords
powder
furnace
crystal
matl
prodn
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.)
Withdrawn
Application number
FR7320349A
Other languages
French (fr)
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.)
Preussag AG
Original Assignee
Preussag AG
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 Preussag AG filed Critical Preussag AG
Publication of FR2232361A1 publication Critical patent/FR2232361A1/en
Withdrawn legal-status Critical Current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
    • C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
    • C30B11/04—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method adding crystallising materials or reactants forming it in situ to the melt
    • C30B11/08—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method adding crystallising materials or reactants forming it in situ to the melt every component of the crystal composition being added during the crystallisation
    • C30B11/10—Solid or liquid components, e.g. Verneuil method

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Glanulating (AREA)

Abstract

Particulate material is melted in an oxyhydrogen flame in a furnace, producing spheres of =10 mu dia. which are separated from the combustion products. There spheres may be mixed with untreated powder in such proportions as are necessary to produce a freely flowing mixt. or may be further treated in a pebble mill with untreated powder. The powder is used in the drawing of crystals by the Verneuil process which requires a steady metered flow rate of material. A proportion of spherical particles in otherwise powdery material impart free-flowing qualities to the mixt., preventing blockages and consequent interruptions to the crystal growing process.
FR7320349A 1972-06-27 1973-06-05 Powder for crystal prodn by the Verneuil process - obtd. by melting particulate matl. in furnace Withdrawn FR2232361A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2231372 1972-06-27

Publications (1)

Publication Number Publication Date
FR2232361A1 true FR2232361A1 (en) 1975-01-03

Family

ID=5848914

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7320349A Withdrawn FR2232361A1 (en) 1972-06-27 1973-06-05 Powder for crystal prodn by the Verneuil process - obtd. by melting particulate matl. in furnace

Country Status (1)

Country Link
FR (1) FR2232361A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098724A1 (en) * 1982-06-25 1984-01-18 Sumitomo Chemical Company, Limited Single crystal production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098724A1 (en) * 1982-06-25 1984-01-18 Sumitomo Chemical Company, Limited Single crystal production

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Legal Events

Date Code Title Description
ST Notification of lapse