GB712735A - Improvements in producing asteriated corundum crystals - Google Patents
Improvements in producing asteriated corundum crystalsInfo
- Publication number
- GB712735A GB712735A GB29883/52A GB2988352A GB712735A GB 712735 A GB712735 A GB 712735A GB 29883/52 A GB29883/52 A GB 29883/52A GB 2988352 A GB2988352 A GB 2988352A GB 712735 A GB712735 A GB 712735A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystals
- corundum
- heating
- crystal
- titania
- 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
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
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (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
712,735. Artificial gems. UNION CARBIDE & CARBON CORPORATION. Nov. 26, 1952 [Dec. 28, 1951], No. 29883/52. Class 43 In making artificial gems-such as rubies and sapphires, a single crystal of corundum is rendered capable of asteriation through the precipitation of rutile upon subsequent heating, by subjecting the crystal to a preparatory heating at a temperaturebetween 1700‹C and 1950‹C while maintaining a titanium compound in contact with its. surface, whereby some of the titanium compound is diffused into the crystal. The preparatory heating is carried out for at least one hour, the length of the heating period being varied in inverse relation to the temperature, and preferably being for between eight and twenty-four hours, Contact with a titanium compound during the preparatory heating may be effected by embedding the crystals in a mixture comprising titania, or the crystals may be coated with an aqueous mixture which contains titania and is allowed to dry upon the crystal surface prior to the preparatory heating. A suitable aqueous mixture contains 30-40 per cent titania and 60-70 percent alumina. The process may be employed for improving poorly asteriated corundum crystals, and is applicable to corundum crystals of any shape, such as rough natural crystals, or whole or half boules of synthetic corundum, the most desirable products being obtained by treating cabochon gemstones which have been cut from larger crystals of natural or synthetic corundum.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US712735XA | 1951-12-28 | 1951-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB712735A true GB712735A (en) | 1954-07-28 |
Family
ID=22100318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29883/52A Expired GB712735A (en) | 1951-12-28 | 1952-11-26 | Improvements in producing asteriated corundum crystals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB712735A (en) |
-
1952
- 1952-11-26 GB GB29883/52A patent/GB712735A/en not_active Expired
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