GB1367462A - Forming of articles from powder - Google Patents

Forming of articles from powder

Info

Publication number
GB1367462A
GB1367462A GB5264170A GB5264170A GB1367462A GB 1367462 A GB1367462 A GB 1367462A GB 5264170 A GB5264170 A GB 5264170A GB 5264170 A GB5264170 A GB 5264170A GB 1367462 A GB1367462 A GB 1367462A
Authority
GB
United Kingdom
Prior art keywords
powder
charges
compacts
spacers
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
GB5264170A
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 GB5264170A priority Critical patent/GB1367462A/en
Publication of GB1367462A publication Critical patent/GB1367462A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/003—Articles made for being fractured or separated into parts
    • 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)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Abstract

1367462 Hot pressed Si 3 N 4 DEFENCE SECRETARY OF STATE FOR 28 Oct 1971 [5 Nov 1970] 52641/70 Heading C7D A number of Si 3 N 4 compacts having at least one curved face are simultaneously formed in one hot pressing operation. The compacts are preferably formed as a block with adjacent compacts joined by a web which is removed by machining. The Si 3 N 4 powder is preferably mixed with MgO powder in a ratio of 20:1 v hot pressed at 1200 p.s.i. and 1850‹C. As shown in Fig.4 the mould 30 is fitted with powder charges 32 separated by graphite spacers 34, the charges and spacers alternating in the horizontal and vertical planes. Hot pressing is effected via tap and punch which has projections 38 and 40 contacting the top row of powder charges and spacers. The powder charges are preferably precompacted cold at 10-15 t.s.i. before charging the mould.
GB5264170A 1971-10-28 1971-10-28 Forming of articles from powder Expired GB1367462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5264170A GB1367462A (en) 1971-10-28 1971-10-28 Forming of articles from powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5264170A GB1367462A (en) 1971-10-28 1971-10-28 Forming of articles from powder

Publications (1)

Publication Number Publication Date
GB1367462A true GB1367462A (en) 1974-09-18

Family

ID=10464712

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5264170A Expired GB1367462A (en) 1971-10-28 1971-10-28 Forming of articles from powder

Country Status (1)

Country Link
GB (1) GB1367462A (en)

Cited By (2)

* 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.
EP0330830A1 (en) * 1988-02-27 1989-09-06 Sintermetallwerk Krebsöge GmbH Process for preparing parts by means of forging powder

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.
EP0120846A4 (en) * 1982-09-30 1985-03-08 Ford Motor Co Method of fabricating hot pressed ceramic bodies.
EP0330830A1 (en) * 1988-02-27 1989-09-06 Sintermetallwerk Krebsöge GmbH Process for preparing parts by means of forging powder

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee