GB706728A - Improvements in or relating to the moulding of ceramics - Google Patents

Improvements in or relating to the moulding of ceramics

Info

Publication number
GB706728A
GB706728A GB25367/51A GB2536751A GB706728A GB 706728 A GB706728 A GB 706728A GB 25367/51 A GB25367/51 A GB 25367/51A GB 2536751 A GB2536751 A GB 2536751A GB 706728 A GB706728 A GB 706728A
Authority
GB
United Kingdom
Prior art keywords
wax
mould
oil
per cent
resin
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
GB25367/51A
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.)
Bendix Aviation Corp
Original Assignee
Bendix Aviation Corp
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 Bendix Aviation Corp filed Critical Bendix Aviation Corp
Publication of GB706728A publication Critical patent/GB706728A/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
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B35/63432—Polystyrenes
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
    • 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
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • 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
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/638—Removal thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

706,728. Injection-moulding ceramic material; refractory compositions. BENDIX AVIATION CORPORATION. Oct. 30, 1951 [Nov. 28, 1950], No. 25367/51. Addition to 671,371. Classes 22 and 87 (2) A ceramic article is made by injecting into a mould a mix comprising ceramic material, thermoplastic resin, one or more waxes vaporising between the temperatures of 300‹F, and that at which the resin is removed and an oil vaporising below 300‹F., and after moulding heating the moulded article at progressively raised temperatures to vaporise first the oil, then the wax and finally to remove resin and fire the article. Thus, the moulded article is removed from the mould and heated at 125‹F., rising in steps to 450‹F. At 125-300‹F. the oil comes off, thereby forming minute.pores in the article, 'then the wax vaporises between 300‹F. and the temperature at which the resin is removed, viz. 400-450‹F., the vaporised wax passing through the minute pores made by the vaporised oil, and finally resin passes off, probably in the form of decomposition products. At this heating stage only 75 per cent. of the resin may be removed, the remainder being removed by the subsequent firing. More than one oil and wax, vaporising in sequence, may be used. The ceramic material may be composed of tri-calcium penta-aluminate and silica in the proportions stated in U.S.A. Specification 2,423,958 or the material specified below. The oil may be a light oil, the wax may be beeswax, carnauba wax, "Acrawax" (a synthetic wax) or any animal vegetable or mineral wax having a suitable vaporising temperature, and the resin may be polystyrene. In an example 76.92 per cent. by weight of a 200-mesh non-uniform particle size ceramic material containing 88 per 'cent. of Al2O3, 10 per cent. of 3CaO, 5 Al2O3, 2 per cent. of SiO2 and some traces of MgO as impurity is mixed with 13.34 per cent of polystyrene powdered to 200 mesh, 6.92 per cent, of light oil vaporising between 125 and 300‹F. and 2.82 per cent. of beeswax which vaporises above 300‹F. This mixture is ground and moulded cold or at temperatures up to 150‹F. into circular preforms 17. When a preform is to be injectionmoulded it is heated by high frequency to 300- 350‹F., transferred quickly to a pressure chamber 15 and ejected therefrom through sprue 14 into a cold mould 12 (as shown, a spark plug mould having a removable core 13, but it may be a mould for making elbow or thread guides). The mould has air vents remote from the injection inlet. The article is taken from the mould and heated as described above.
GB25367/51A 1950-11-28 1951-10-30 Improvements in or relating to the moulding of ceramics Expired GB706728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US706728XA 1950-11-28 1950-11-28

Publications (1)

Publication Number Publication Date
GB706728A true GB706728A (en) 1954-04-07

Family

ID=22096699

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25367/51A Expired GB706728A (en) 1950-11-28 1951-10-30 Improvements in or relating to the moulding of ceramics

Country Status (1)

Country Link
GB (1) GB706728A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2413345A1 (en) * 1977-12-27 1979-07-27 Carborundum Co PROCESS AND COMPOSITION OF MOLDING BY INJECTION OF CERAMIC MATERIALS
FR2432491A1 (en) * 1978-08-03 1980-02-29 Carborundum Co CERAMIC COMPOSITION SUITABLE FOR INJECTION MOLDING AND SINTERING
FR2505816A1 (en) * 1981-05-18 1982-11-19 Ceraver PROCESS FOR PRODUCING A CERAMIC PIECE OF FRITTE SILICON CARBIDE
US4649003A (en) * 1983-01-24 1987-03-10 Sumitomo Chemical Company, Limited Method for producing an inorganic sintered body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2413345A1 (en) * 1977-12-27 1979-07-27 Carborundum Co PROCESS AND COMPOSITION OF MOLDING BY INJECTION OF CERAMIC MATERIALS
FR2432491A1 (en) * 1978-08-03 1980-02-29 Carborundum Co CERAMIC COMPOSITION SUITABLE FOR INJECTION MOLDING AND SINTERING
FR2505816A1 (en) * 1981-05-18 1982-11-19 Ceraver PROCESS FOR PRODUCING A CERAMIC PIECE OF FRITTE SILICON CARBIDE
EP0065710A1 (en) * 1981-05-18 1982-12-01 CERAVER Société anonyme dite: Method of making a sintered silicom carbide ceramic article
US4424179A (en) 1981-05-18 1984-01-03 Societe Anonyme Dite: Ceraver Method of manufacturing a sintered silicon carbide ceramic part
US4649003A (en) * 1983-01-24 1987-03-10 Sumitomo Chemical Company, Limited Method for producing an inorganic sintered body

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