GB1026807A - Method for producing powdered alpha alumina containing magnesium oxide,and the preparation of high-density translucent alumina ceramic therefrom - Google Patents

Method for producing powdered alpha alumina containing magnesium oxide,and the preparation of high-density translucent alumina ceramic therefrom

Info

Publication number
GB1026807A
GB1026807A GB4775962A GB4775962A GB1026807A GB 1026807 A GB1026807 A GB 1026807A GB 4775962 A GB4775962 A GB 4775962A GB 4775962 A GB4775962 A GB 4775962A GB 1026807 A GB1026807 A GB 1026807A
Authority
GB
United Kingdom
Prior art keywords
al2o3
therefrom
preparation
magnesium oxide
containing magnesium
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
GB4775962A
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.)
General Electric Co
Original Assignee
General Electric 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 General Electric Co filed Critical General Electric Co
Publication of GB1026807A publication Critical patent/GB1026807A/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
    • C04B35/10—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 aluminium oxide

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Powdered a -Al2O3 containing 0.06 to 1% MgO is prepared by heating a mixture of Al2(SO4)3 and a magnesium salt decomposable to MgO to a temperature up to 1100 DEG C., e.g. 950-1100 DEG C., to drive off volatile components and form powdered g -Al2O3, and further heating to up to 1700 DEG C., e.g. 1200-13- DEG C., to convert g -Al2O3 to a -Al2O3. Commercial mono-clinic Al2(SO4)3.#cH2O (#c is 12-18) may be used, and the magnesium salt may be sulphate, nitrate or carbonate. The mixture of a -Al2O3 and MgO may be formed into translucent alumina ware by crushing to - 18 mesh B.S.S. and pressing at 5 to 50 tons/sq. inch to give a compact of density not less than 35% that of a single alumina crystal. This compact is fired in air at 800-1200 DEG C. for e.g. 1 hour, machined to shape, and fired at 1700-1950 DEG C. in H2 or vacuo to remove air pores.
GB4775962A 1961-12-26 1962-12-18 Method for producing powdered alpha alumina containing magnesium oxide,and the preparation of high-density translucent alumina ceramic therefrom Expired GB1026807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16222961A 1961-12-26 1961-12-26

Publications (1)

Publication Number Publication Date
GB1026807A true GB1026807A (en) 1966-04-20

Family

ID=22584726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4775962A Expired GB1026807A (en) 1961-12-26 1962-12-18 Method for producing powdered alpha alumina containing magnesium oxide,and the preparation of high-density translucent alumina ceramic therefrom

Country Status (2)

Country Link
ES (1) ES281533A1 (en)
GB (1) GB1026807A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2077367A1 (en) * 1970-01-28 1971-10-22 Grace W R Ltd

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2077367A1 (en) * 1970-01-28 1971-10-22 Grace W R Ltd

Also Published As

Publication number Publication date
ES281533A1 (en) 1963-03-16

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