GB1408648A - Treatment of corundum crystals - Google Patents

Treatment of corundum crystals

Info

Publication number
GB1408648A
GB1408648A GB5846772A GB5846772A GB1408648A GB 1408648 A GB1408648 A GB 1408648A GB 5846772 A GB5846772 A GB 5846772A GB 5846772 A GB5846772 A GB 5846772A GB 1408648 A GB1408648 A GB 1408648A
Authority
GB
United Kingdom
Prior art keywords
dec
crystal
treatment
corundum crystals
powder
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
GB5846772A
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.)
Union Carbide Corp
Original Assignee
Union Carbide 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 Union Carbide Corp filed Critical Union Carbide Corp
Publication of GB1408648A publication Critical patent/GB1408648A/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
    • 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
    • C30B29/22—Complex oxides
    • C30B29/26—Complex oxides with formula BMe2O4, wherein B is Mg, Ni, Co, Al, Zn, or Cd and Me is Fe, Ga, Sc, Cr, Co, or Al
    • 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
    • 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
    • C30B31/00—Diffusion or doping processes for single crystals or homogeneous polycrystalline material with defined structure; Apparatus therefor
    • C30B31/02—Diffusion or doping processes for single crystals or homogeneous polycrystalline material with defined structure; Apparatus therefor by contacting with diffusion materials in the solid state

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

1408648 Gems UNION CARBIDE CORP 19 Dec 1972 [20 Dec 1971 4 Dec 1972] 58467/ 72 Heading A3H [Also in Division Cl] Gem stones are produced by masking imperfections of corundum crystals by contacting the surface of the crystal with a powder comprising alumina containing 1-30% by wt. of TiO 2 and 0.25-20% by wt of a metal oxide colourant and heating the crystal in contact with the powder at 1600-1850‹C for 2-200 hours. The oxide colourant is preferably an oxide of iron, chromium, nickel or vanadium. The crystal may be subjected to a further conventional asteriating treatment at 1100-1500‹C.
GB5846772A 1971-12-20 1972-12-19 Treatment of corundum crystals Expired GB1408648A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21014071A 1971-12-20 1971-12-20
US312132A US3897529A (en) 1971-12-20 1972-12-04 Altering the appearance of corundum crystals

Publications (1)

Publication Number Publication Date
GB1408648A true GB1408648A (en) 1975-10-01

Family

ID=26904856

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5846772A Expired GB1408648A (en) 1971-12-20 1972-12-19 Treatment of corundum crystals

Country Status (9)

Country Link
US (1) US3897529A (en)
AT (1) AT330722B (en)
BE (1) BE793007A (en)
CA (1) CA978836A (en)
CH (1) CH554811A (en)
DE (1) DE2262104A1 (en)
FR (1) FR2164690B1 (en)
GB (1) GB1408648A (en)
IL (1) IL41125A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144622A (en) * 1983-08-03 1985-03-13 Giovanni Colliva Gemstones and apparatus for their lapidation
US4686795A (en) * 1982-09-16 1987-08-18 Giovanni Colliva Principles and appliances for cutting of spherical-faceted gems and gems thus obtained
CN110241458A (en) * 2019-05-24 2019-09-17 淅川正弘单晶刚玉厂 The production method of canescence single alundum

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5126094A (en) * 1989-03-02 1992-06-30 Farzin Nia Farrokh Heat treatment of an orthodontic bracket
DE4201490A1 (en) * 1992-01-21 1993-07-22 Otto Feuerfest Gmbh FIRE-RESISTANT MATERIAL FOR ELECTROLYSIS OVENS, METHOD FOR THE PRODUCTION AND USE OF THE FIRE-RESISTANT MATERIAL
US5762896A (en) * 1995-08-31 1998-06-09 C3, Inc. Silicon carbide gemstones
US5664440A (en) * 1996-06-05 1997-09-09 Roemer; Thomas Bruce Enhanced diamond ring
US6635309B2 (en) * 2001-03-12 2003-10-21 Richard D. Pollak Process for the color enhancement of gemstones
US6872422B2 (en) 2001-07-09 2005-03-29 Samir Gupta Process for imparting and enhancement of colours in gemstone minerals and gemstone minerals obtained thereby
US7526928B1 (en) 2002-11-04 2009-05-05 Azotic Coating Technology, Inc. Multi-color gemstones and gemstone coating deposition technology
US6997014B2 (en) * 2002-11-04 2006-02-14 Azotic Coating Technology, Inc. Coatings for gemstones and other decorative objects

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US988230A (en) * 1910-05-10 1911-03-28 Heller & Son L Process of producing synthetic sapphires.
US1814219A (en) * 1926-05-17 1931-07-14 Ig Farbenindustrie Ag Process of improving certain physical properties of synthetic precious stones
US1775867A (en) * 1928-01-19 1930-09-16 Swiss Jewel Co S A Synthetic oriental emerald or emerald-green sapphire
US2448511A (en) * 1943-10-01 1948-09-07 Linde Air Prod Co Glossing corundum and spinel
US2488507A (en) * 1947-08-27 1949-11-15 Linde Air Prod Co Synthetic star rubies and star sapphires, and process for producing same
US2690062A (en) * 1949-12-21 1954-09-28 Union Carbide & Carbon Corp Synthetic corundum crystals and process for making same
FR1067037A (en) * 1951-12-28 1954-06-11 Union Carbide & Carbon Corp Process for manufacturing corundum crystals with a star structure
US2690630A (en) * 1951-12-28 1954-10-05 Union Carbide & Carbon Corp Producing asteriated corundum crystals
FR1119461A (en) * 1954-02-19 1956-06-20 Degussa Synthetic jewelry and their manufacturing processes
BE635034A (en) * 1962-08-10
US3539379A (en) * 1968-05-02 1970-11-10 Liner Technology Inc Process for coating gem stones
US3713877A (en) * 1969-02-10 1973-01-30 H Kirchner Method of strengthening ceramic bodies and strengthened ceramic bodies produced thereby

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4686795A (en) * 1982-09-16 1987-08-18 Giovanni Colliva Principles and appliances for cutting of spherical-faceted gems and gems thus obtained
GB2144622A (en) * 1983-08-03 1985-03-13 Giovanni Colliva Gemstones and apparatus for their lapidation
CN110241458A (en) * 2019-05-24 2019-09-17 淅川正弘单晶刚玉厂 The production method of canescence single alundum

Also Published As

Publication number Publication date
CH554811A (en) 1974-10-15
AT330722B (en) 1976-07-12
FR2164690A1 (en) 1973-08-03
FR2164690B1 (en) 1976-10-29
DE2262104A1 (en) 1973-07-19
BE793007A (en) 1973-06-19
IL41125A (en) 1976-02-29
ATA1084872A (en) 1975-10-15
CA978836A (en) 1975-12-02
US3897529A (en) 1975-07-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee