GB665373A - Improvements in or relating to production of dense oxide bodies - Google Patents

Improvements in or relating to production of dense oxide bodies

Info

Publication number
GB665373A
GB665373A GB474149A GB474149A GB665373A GB 665373 A GB665373 A GB 665373A GB 474149 A GB474149 A GB 474149A GB 474149 A GB474149 A GB 474149A GB 665373 A GB665373 A GB 665373A
Authority
GB
United Kingdom
Prior art keywords
beryllia
sintering
carbon
graphite
minutes
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
GB474149A
Inventor
Raymond Francis Walker
Stefan George Bauer
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.)
Minister of Supply In Her Majesty S Government
Original Assignee
Minister of Supply In Her Majesty S Government
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 Minister of Supply In Her Majesty S Government filed Critical Minister of Supply In Her Majesty S Government
Priority to GB474149A priority Critical patent/GB665373A/en
Publication of GB665373A publication Critical patent/GB665373A/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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • 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
    • C04B35/08—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 beryllium oxide
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes

Abstract

Dense bodies of refractory oxides, e.g. beryllia, alumina, zirconia and thoria, are produced by sintering shaped masses of the oxides while enveloped in a non-reacting gas containing free carbon. The body may be shaped by slip casting or cold pressing, and the shaped mass may be pressed during the heat treatment. The presence of free carbon during the sintering is obtained by heating the body in, say, a graphite tube furnace, or by heating in the absence of massive graphite, and in the presence of an atmosphere of inert or non-reactive gas, e.g. argon or nitrogen containing a carbon suspension or a gas decomposable to release carbon. The process is described in detail in connection with beryllia, which is ball-milled. treated with dilute hydrochloric acid for the removal of iron, made into a slip, and cast into a plaster of Paris mould; the air-dried castings are usually prefired at 1000 DEG C., and sintered at 1500-1800 DEG C. for 10-30 minutes in an inert or reducing gas in a graphite tube furnace. (Reference is also made to sintering in a beryllia tube in the presence of hydrogen and carbon dioxide, reacting to produce carbon monoxide). Alternatively, beryllia powder is pressed at 3100 per sq. inch in a graphite crucible heated up to 1600 DEG C. in a graphite tube furnace swept by argon, the pressure being maintained. For alumina, a sintering temperature of 1700 DEG C. for 3 minutes is mentioned, and for zirconia and thoria, 1800 DEG C. for 10 minutes.
GB474149A 1949-02-21 1949-02-21 Improvements in or relating to production of dense oxide bodies Expired GB665373A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB474149A GB665373A (en) 1949-02-21 1949-02-21 Improvements in or relating to production of dense oxide bodies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB474149A GB665373A (en) 1949-02-21 1949-02-21 Improvements in or relating to production of dense oxide bodies

Publications (1)

Publication Number Publication Date
GB665373A true GB665373A (en) 1952-01-23

Family

ID=9782902

Family Applications (1)

Application Number Title Priority Date Filing Date
GB474149A Expired GB665373A (en) 1949-02-21 1949-02-21 Improvements in or relating to production of dense oxide bodies

Country Status (1)

Country Link
GB (1) GB665373A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301689A (en) * 1962-02-27 1967-01-31 Brush Beryllium Co Vacuum fired beryllia ware
US4383957A (en) * 1980-05-29 1983-05-17 Sumitomo Electric Industries, Ltd. Method of sintering a ceramic composition
US4981823A (en) * 1985-11-27 1991-01-01 Cbl Ceramics Limited Beryllium oxide based ceramics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3301689A (en) * 1962-02-27 1967-01-31 Brush Beryllium Co Vacuum fired beryllia ware
US4383957A (en) * 1980-05-29 1983-05-17 Sumitomo Electric Industries, Ltd. Method of sintering a ceramic composition
US4981823A (en) * 1985-11-27 1991-01-01 Cbl Ceramics Limited Beryllium oxide based ceramics

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