FR2107166A5 - Transparent optical element - prodn from magnesia - alumina spinel an lithium fluoride by hot-pressure moulding - Google Patents

Transparent optical element - prodn from magnesia - alumina spinel an lithium fluoride by hot-pressure moulding

Info

Publication number
FR2107166A5
FR2107166A5 FR7131743A FR7131743A FR2107166A5 FR 2107166 A5 FR2107166 A5 FR 2107166A5 FR 7131743 A FR7131743 A FR 7131743A FR 7131743 A FR7131743 A FR 7131743A FR 2107166 A5 FR2107166 A5 FR 2107166A5
Authority
FR
France
Prior art keywords
optical element
prodn
magnesia
hot
lithium fluoride
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
FR7131743A
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.)
Coors Porcelain Co
Original Assignee
Coors Porcelain Co
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 Coors Porcelain Co filed Critical Coors Porcelain Co
Application granted granted Critical
Publication of FR2107166A5 publication Critical patent/FR2107166A5/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
    • C04B35/443—Magnesium aluminate spinel
    • 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

Abstract

High temp-resistant optical element transparent in visible and infra-red wave ranges of electromagnetic spectrum, useful as casing-windows for ionised alkali vapour lamps, is produced by heating material of 1 mu particle size, contg. equimolar amounts of MgO and Al203 and evenly mixed with 0.2-4, pref. 2, wt.% powdered LiF, in vacuo to 800-1250 degrees C, and then exerting a pressure of >=980, pref. >1050, kg/cm2 on material for 30-60 min. after its temp. has been raised to 1300-1600 degrees C.
FR7131743A 1970-09-03 1971-09-02 Transparent optical element - prodn from magnesia - alumina spinel an lithium fluoride by hot-pressure moulding Expired FR2107166A5 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6950670A 1970-09-03 1970-09-03

Publications (1)

Publication Number Publication Date
FR2107166A5 true FR2107166A5 (en) 1972-05-05

Family

ID=22089443

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7131743A Expired FR2107166A5 (en) 1970-09-03 1971-09-02 Transparent optical element - prodn from magnesia - alumina spinel an lithium fluoride by hot-pressure moulding

Country Status (2)

Country Link
DE (1) DE2144288A1 (en)
FR (1) FR2107166A5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332393A1 (en) * 1988-03-09 1989-09-13 Sumitomo Electric Industries, Ltd. Method of producing a light-transmitting spinel sintered body
WO1996009997A1 (en) * 1994-02-28 1996-04-04 Alexandr Axentievich Dabizha Charge for obtaining cordierite and methods of obtaining alumino-magnesia spinel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924287C2 (en) * 1979-06-15 1983-08-11 Viktor Fedorovič Šilin Process for the production of highly refractory ceramic products based on spinel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0332393A1 (en) * 1988-03-09 1989-09-13 Sumitomo Electric Industries, Ltd. Method of producing a light-transmitting spinel sintered body
US5152940A (en) * 1988-03-09 1992-10-06 Sumitomo Electric Industries, Ltd. Method of producing a light-transmitting spinel sintered body
WO1996009997A1 (en) * 1994-02-28 1996-04-04 Alexandr Axentievich Dabizha Charge for obtaining cordierite and methods of obtaining alumino-magnesia spinel

Also Published As

Publication number Publication date
DE2144288A1 (en) 1972-03-09

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Legal Events

Date Code Title Description
ST Notification of lapse