GB1364451A - Hot pressing silicon nitride - Google Patents

Hot pressing silicon nitride

Info

Publication number
GB1364451A
GB1364451A GB5264270A GB5264270A GB1364451A GB 1364451 A GB1364451 A GB 1364451A GB 5264270 A GB5264270 A GB 5264270A GB 5264270 A GB5264270 A GB 5264270A GB 1364451 A GB1364451 A GB 1364451A
Authority
GB
United Kingdom
Prior art keywords
hot pressing
coated
silicon nitride
graphite
mgo
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
GB5264270A
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 GB5264270A priority Critical patent/GB1364451A/en
Priority to IT305471A priority patent/IT943642B/en
Priority to DE19712154479 priority patent/DE2154479A1/en
Priority to FR7139741A priority patent/FR2113613A5/fr
Publication of GB1364451A publication Critical patent/GB1364451A/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
    • C04B35/515—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)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Products (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

1364451 Hot pressing silicon nitride DEFENCE SECRETARY OF STATE FOR 26 Oct 1971[5 Nov 1970] 52642/70 Heading C7D A number of Si 3 N 4 articles are formed by simultaneously hot pressing a number of charges 24 of Si 3 N 4 powder and a flux in a die 10 with each charge separated by a spacer 22 coated with a release agent. The charges preferably consist of a -300 mesh mixture of Si 3 N 4 and MgO in a weight ratio of 20:1 and the graphite spacers 22 are coated with an aqueous suspension of MgO. The inside walls of the graphite die 10 may be coated with BN. A mould space divider 48 comprising circular sheet metal band 50 with radially extending arms 52 may be used for charging the powder on the graphite spacers 22 and removed after charging. The hot pressing temperature is controlled to maintain the charge below 1900-2050‹C which is the Si 3 N 4 dissociation temperature.
GB5264270A 1970-11-05 1970-11-05 Hot pressing silicon nitride Expired GB1364451A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB5264270A GB1364451A (en) 1970-11-05 1970-11-05 Hot pressing silicon nitride
IT305471A IT943642B (en) 1970-11-05 1971-10-29 METHOD AND APPARATUS FOR PRODUCING SILICON NITRIDE ARTICLES
DE19712154479 DE2154479A1 (en) 1970-11-05 1971-11-02 Method and device for the simultaneous production of several compacted silicon nitride molded bodies by means of hot pressing
FR7139741A FR2113613A5 (en) 1970-11-05 1971-11-05

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5264270A GB1364451A (en) 1970-11-05 1970-11-05 Hot pressing silicon nitride

Publications (1)

Publication Number Publication Date
GB1364451A true GB1364451A (en) 1974-08-21

Family

ID=10464716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5264270A Expired GB1364451A (en) 1970-11-05 1970-11-05 Hot pressing silicon nitride

Country Status (4)

Country Link
DE (1) DE2154479A1 (en)
FR (1) FR2113613A5 (en)
GB (1) GB1364451A (en)
IT (1) IT943642B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120846A1 (en) * 1982-09-30 1984-10-10 Ford Motor Co Method of fabricating hot pressed ceramic bodies.
EP0121515A1 (en) * 1982-09-30 1984-10-17 Ford Motor Company Limited Method of hot pressing reactive materials
EP0121516A1 (en) * 1982-09-30 1984-10-17 Ford Motor Co Method of forming dense ceramic bodies.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3377984D1 (en) * 1983-07-19 1988-10-20 Ford Motor Co Making hot pressed silicon nitride by use of low density reaction bonded body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0120846A1 (en) * 1982-09-30 1984-10-10 Ford Motor Co Method of fabricating hot pressed ceramic bodies.
EP0121515A1 (en) * 1982-09-30 1984-10-17 Ford Motor Company Limited Method of hot pressing reactive materials
EP0121516A1 (en) * 1982-09-30 1984-10-17 Ford Motor Co Method of forming dense ceramic bodies.
EP0121515A4 (en) * 1982-09-30 1985-03-06 Ford Motor Co Method of hot pressing reactive materials.
EP0121516A4 (en) * 1982-09-30 1985-03-08 Ford Motor Co Method of forming dense ceramic bodies.
EP0120846A4 (en) * 1982-09-30 1985-03-08 Ford Motor Co Method of fabricating hot pressed ceramic bodies.

Also Published As

Publication number Publication date
FR2113613A5 (en) 1972-06-23
IT943642B (en) 1973-04-10
DE2154479A1 (en) 1972-05-25

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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