GB1370285A - Forming a body from silicon nitride - Google Patents

Forming a body from silicon nitride

Info

Publication number
GB1370285A
GB1370285A GB5217670A GB5217670A GB1370285A GB 1370285 A GB1370285 A GB 1370285A GB 5217670 A GB5217670 A GB 5217670A GB 5217670 A GB5217670 A GB 5217670A GB 1370285 A GB1370285 A GB 1370285A
Authority
GB
United Kingdom
Prior art keywords
silicon nitride
cores
mixture
vaporizable
mould
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
GB5217670A
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB5217670A priority Critical patent/GB1370285A/en
Publication of GB1370285A publication Critical patent/GB1370285A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/025—Hot pressing, e.g. of ceramic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
    • 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
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • C04B35/593—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride obtained by pressure sintering

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

1370285 Moulding ceramic articles DEFENCE SECRETARY OF STATE FOR 28 Oct 1971 [3 Nov 1970] 52176/70 Heading B5A A ceramic body with internal ducts is produced by filling a mould with a powder mixture of silicon nitride and a fluxing agent and a number of vaporizable cores distributed in a pattern, and hot pressing the mixture until the cores vaporize, the cores being vaporizable at a temperature at or above that at which the silicon nitride body is formed and below that at which the silicon nitride dissociates. The mould may be of graphite and the fluxing agent of magnesium oxide; the. cores may comprise a mixture of magnesia, lampblack, ammonia and flour, and the powder mixture may comprise, by weight, one part magnesia to twenty parts silicon nitride. The mixture may be hot pressed at approximately 1800‹ C. and at a pressure of approximately 1100 p.s.i.
GB5217670A 1971-10-28 1971-10-28 Forming a body from silicon nitride Expired GB1370285A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5217670A GB1370285A (en) 1971-10-28 1971-10-28 Forming a body from silicon nitride

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5217670A GB1370285A (en) 1971-10-28 1971-10-28 Forming a body from silicon nitride

Publications (1)

Publication Number Publication Date
GB1370285A true GB1370285A (en) 1974-10-16

Family

ID=10462922

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5217670A Expired GB1370285A (en) 1971-10-28 1971-10-28 Forming a body from silicon nitride

Country Status (1)

Country Link
GB (1) GB1370285A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2271526A (en) * 1992-10-16 1994-04-20 Gt B Components Ltd Manufacture of apertured articles by compression moulding
US5385700A (en) * 1991-05-03 1995-01-31 Programme 3 Patent Holdings Method of making a holder of ceramic material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385700A (en) * 1991-05-03 1995-01-31 Programme 3 Patent Holdings Method of making a holder of ceramic material
GB2271526A (en) * 1992-10-16 1994-04-20 Gt B Components Ltd Manufacture of apertured articles by compression moulding
GB2271526B (en) * 1992-10-16 1995-06-21 Gt B Components Ltd Moulding of apertured articles

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee