GB1104715A - Method of growing alpha-alumina single crystal ribbons - Google Patents

Method of growing alpha-alumina single crystal ribbons

Info

Publication number
GB1104715A
GB1104715A GB24412/65A GB2441265A GB1104715A GB 1104715 A GB1104715 A GB 1104715A GB 24412/65 A GB24412/65 A GB 24412/65A GB 2441265 A GB2441265 A GB 2441265A GB 1104715 A GB1104715 A GB 1104715A
Authority
GB
United Kingdom
Prior art keywords
melt
single crystal
during
aluminium
hydrogen
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
GB24412/65A
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.)
THERMOKINETIC FIBERS Inc
Original Assignee
THERMOKINETIC FIBERS Inc
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 THERMOKINETIC FIBERS Inc filed Critical THERMOKINETIC FIBERS Inc
Publication of GB1104715A publication Critical patent/GB1104715A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/42—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation
    • C01F7/422—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation by oxidation with a gaseous oxidator at a high temperature
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/42—Preparation of aluminium oxide or hydroxide from metallic aluminium, e.g. by oxidation
    • 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
    • C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
    • C30B25/005—Growth of whiskers or needles
    • 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
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/16—Oxides
    • C30B29/20—Aluminium oxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

1,104,715. Alpha Al 2 O 3 single crystal ribbons; aluminous ceramic. THERMOKINETIC FIBERS Inc. 9 June, 1965 [10 June, 1964], No. 24412/65. Headings C1A and C1J. Alpha Al 2 O 3 single crystal ribbons are made by passing hydrogen and water vapour over a melt of aluminium and periodically increasing the water content of the hydrogen over the melt during the period of growth, e.g. from 300 p.p.m. to 3000 p.p.m. The water content of the H 2 preferably reaches a maximum of 40,000 p.p.m. at the end of the run. The temperature of the melt may be periodically increased during the run within the range 2200-3500‹ F. The melt may be contacted with essentially dry hydrogen, e.g. less than 50 p.p.m. water, during a first pre-growth stage. The flow rate of the hydrogen is preferably rapid during the first pre-growth stage, and then substantially decreased during the growth stage. The aluminium melt may be contained in a receptacle comprising a fired intimate mixture of Al 2 O 3 and finely divided aluminium particles and optionally one or more additional oxides, namely SiO 2 , TiO 2 , Fe 2 O 3 , Cr 2 O 3 , ZrO 2 and cobalt oxide. The free aluminium content of the receptacle may be from 1 to 20% by wt.; and the constituents fired in air at 2200-2500‹ F. Alpha alumina single crystal ribbons of rhombohedral cross-section having a width to thickness ratio of from 1 : 1 to 12 : 1, a length of 0À5 to 4 inches, a width of at least 0À5Á and a length:width ratio of from 10 : 1 to 25,000 : 1 are claimed per se.
GB24412/65A 1964-06-10 1965-06-09 Method of growing alpha-alumina single crystal ribbons Expired GB1104715A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37398264A 1964-06-10 1964-06-10
US44315365A 1965-03-26 1965-03-26

Publications (1)

Publication Number Publication Date
GB1104715A true GB1104715A (en) 1968-02-28

Family

ID=31949836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24412/65A Expired GB1104715A (en) 1964-06-10 1965-06-09 Method of growing alpha-alumina single crystal ribbons

Country Status (2)

Country Link
US (1) US3421851A (en)
GB (1) GB1104715A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505014A (en) * 1969-05-02 1970-04-07 Gen Electric Process for producing alpha-alumina whiskers
US3658469A (en) * 1969-10-16 1972-04-25 Robert H Kelsey Continuous production of alumina whiskers
CA2099734A1 (en) * 1992-07-01 1994-01-02 Akihiko Takahashi Process for preparing polyhedral alpha-alumina particles
ES2146506B1 (en) * 1997-02-17 2001-03-16 Univ Santiago Compostela PROCEDURE FOR OBTAINING CRYSTAL ALUMINUM FIBERS.
EP2599749A1 (en) 2011-11-30 2013-06-05 Neoker, S.L Method for the purification of alpha-alumina fibers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA608032A (en) * 1960-11-01 L. Berry Kenneth Process for preparing corundum
US2741822A (en) * 1951-01-29 1956-04-17 Carborundum Co Preparation of refractory products
US3011870A (en) * 1958-09-05 1961-12-05 Union Carbide Corp Process for preparing virtually perfect alumina crystals
US3077380A (en) * 1959-07-24 1963-02-12 Horizons Inc Preparation of sapphire fibers
US3147085A (en) * 1961-09-14 1964-09-01 Gen Electric Apparatus for growing whiskers
US3298842A (en) * 1963-03-22 1967-01-17 Du Pont Process for preparing hollow refractory particles

Also Published As

Publication number Publication date
US3421851A (en) 1969-01-14

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