GB1358716A - Method of growing single crystals of corundum from a powder containing alumina and a method of preparing said powder - Google Patents

Method of growing single crystals of corundum from a powder containing alumina and a method of preparing said powder

Info

Publication number
GB1358716A
GB1358716A GB4692071A GB4692071A GB1358716A GB 1358716 A GB1358716 A GB 1358716A GB 4692071 A GB4692071 A GB 4692071A GB 4692071 A GB4692071 A GB 4692071A GB 1358716 A GB1358716 A GB 1358716A
Authority
GB
United Kingdom
Prior art keywords
powder
per cent
alf
weight
calcined
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
GB4692071A
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.)
TSEITLIN P A DERBENEVA T A ZVE
Original Assignee
TSEITLIN P A DERBENEVA T A ZVE
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 TSEITLIN P A DERBENEVA T A ZVE filed Critical TSEITLIN P A DERBENEVA T A ZVE
Priority to GB4692071A priority Critical patent/GB1358716A/en
Publication of GB1358716A publication Critical patent/GB1358716A/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
    • 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)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

1358716 Alumina powder composition P A TSEITLIN T A DERBENEVA G M ZVEREV and F M ZUBKOVA 8 Oct 1971 46920/71 Heading C1A A single crystal of corundum is grown from a powder including 74-99% by weight aluminium oxide, from 0-6% by weight metallic colouring substance and from 1-20% by weight aluminium fluoride. The powder may be prepared by calcining a mixture containing aluminium hydroxide and from 0-7% by weight of a metallic colouring substance at 1100-1200‹ C. to form a powder containing at least 80 wt. per cent α-aluminium oxide, metallic substance if present being incorporated into α-Al 2 O 3 lattice and mixing the calcined mixture with 1-20 wt. per cent AlF 3 . In Example 1, aluminium hydroxide (containing Al 2 O 3 100 g.) and 0À5 wt. per cent chromium (calculated with respect to Al 2 O 3 ) is calcined at 1150‹ C. for 2 hours, the obtained powder (70 g.) being below 60 Á being mixed with AlF 3 (7À8 g.). The similar preparation of powders containing Ti and Fe is described in Examples 2 and 3. The powder may also be prepared by calcining the hydroxide, 0-7 wt. per cent colouring substance and 5-20 wt. per cent AlF 3 or NH 4 F (calculated with reference to AlF 3 ) at 1050‹ to 1150‹ C. to form at least 80 wt. per cent α-aluminium oxide and again mixing the calcined mixture with AlF 3 . In Example 5 aluminium hydroxide containing Al 2 O 3 (100 g.), chromium (1 wt. per cent) and ammonium fluoride (20 wt. per cent) with respect to AlF 3 is calcined at 1050‹ C. Example 6 describes the use of powder containing γ-Al 2 O 3 (derived from alum) and chromium for growing crystals. Other colouring substances specified are nickel, vanadium and cobalt. Corundum crystals (e.g. ruby, lilac coloured and blue sapphire) may be grown from the powder by the "Verneuil" method.
GB4692071A 1971-10-08 1971-10-08 Method of growing single crystals of corundum from a powder containing alumina and a method of preparing said powder Expired GB1358716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4692071A GB1358716A (en) 1971-10-08 1971-10-08 Method of growing single crystals of corundum from a powder containing alumina and a method of preparing said powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4692071A GB1358716A (en) 1971-10-08 1971-10-08 Method of growing single crystals of corundum from a powder containing alumina and a method of preparing said powder

Publications (1)

Publication Number Publication Date
GB1358716A true GB1358716A (en) 1974-07-03

Family

ID=10443071

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4692071A Expired GB1358716A (en) 1971-10-08 1971-10-08 Method of growing single crystals of corundum from a powder containing alumina and a method of preparing said powder

Country Status (1)

Country Link
GB (1) GB1358716A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0090767A2 (en) * 1982-03-29 1983-10-05 Schweizerische Aluminium Ag Process for the preparation of large crystalline alumina
RU2554196C2 (en) * 2010-03-09 2015-06-27 Сумитомо Кемикал Компани, Лимитед ALUMINIUM α-OXIDE FOR OBTAINING SAPPHIRE MONOCRYSTAL AND METHOD OF OBTAINING THEREOF

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0090767A2 (en) * 1982-03-29 1983-10-05 Schweizerische Aluminium Ag Process for the preparation of large crystalline alumina
EP0090767A3 (en) * 1982-03-29 1985-01-16 Schweizerische Aluminium Ag Process for the preparation of large crystalline alumina
RU2554196C2 (en) * 2010-03-09 2015-06-27 Сумитомо Кемикал Компани, Лимитед ALUMINIUM α-OXIDE FOR OBTAINING SAPPHIRE MONOCRYSTAL AND METHOD OF OBTAINING THEREOF

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Legal Events

Date Code Title Description
PS Patent sealed
429D Case decided by the comptroller ** specification amended (sect. 29/1949)
PCNP Patent ceased through non-payment of renewal fee