GB601847A - Improvements in or relating to ceramic materials - Google Patents

Improvements in or relating to ceramic materials

Info

Publication number
GB601847A
GB601847A GB25984/45A GB2598445A GB601847A GB 601847 A GB601847 A GB 601847A GB 25984/45 A GB25984/45 A GB 25984/45A GB 2598445 A GB2598445 A GB 2598445A GB 601847 A GB601847 A GB 601847A
Authority
GB
United Kingdom
Prior art keywords
per cent
mol per
al2o3
sio2
substantial
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
GB25984/45A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB601847A publication Critical patent/GB601847A/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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/1315—Non-ceramic binders
    • 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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • 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
    • C04B35/16—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 silicates other than clay
    • C04B35/18—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 silicates other than clay rich in aluminium 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
    • C04B35/01—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
    • C04B35/16—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 silicates other than clay
    • C04B35/18—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 silicates other than clay rich in aluminium oxide
    • C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
    • 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
    • C04B35/48—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 zirconium or hafnium oxides, zirconates, zircon or hafnates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
    • H01C17/20—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by pyrolytic processes

Abstract

A fired ceramic material comprising a substantial proportion of small crystals and a substantial proportion of glass comprises 60-80 mol per cent XO2, 17-23 mol per cent Y2O3, where XO2 is SiO2 or SiO2 and a minor proportion of ZrO2, Y2O3 is Al2O3 or Al2O3 and a minor proportion of B2O3, the remainder of the composition being the sum of at least three alkaline earth oxides (including MgO and BeO) each constituting at least one mol per cent of the composition, the ceramic material containing no more than a small amount, preferably not more than 0.5 per cent by weight, of alkali metal oxide. A suitable composition is 66.2 mol per cent SiO2, 21.7 mol per cent Al2O3, 4.3 mol per cent MgO, 3.5 mol per cent CaO, 2.5 mol per cent SrO and 1.8 mol per cent BaO. The crystals and the glass both comprise at least 30 per cent each by volume of the material. The material is formed by firing together a mixture of the necessary finely divided raw materials, the heating rate, maximum temperature and cooling rate being such that substantial proportions of crystals and glass are formed. The alkaline earth oxide ingredients and a portion of the remaining ingredients may be mixed and calcined before being formed into the mixture which is fired to form the ceramic material. The maximum firing temperature is preferably in the vicinity of but below the temperature at which blebs tend to form. The material may be rendered porous by incorporating in the raw materials during mixing a substantial amount of an organic substance such as wood flour which on firing is burnt out and leaves a porous ceramic structure. The material is suitable for making electric resistances by coating with a layer of carbon, and for other general electric insulation purposes. Specification 557,811 is referred to.
GB25984/45A 1944-10-10 1945-10-05 Improvements in or relating to ceramic materials Expired GB601847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US601847XA 1944-10-10 1944-10-10

Publications (1)

Publication Number Publication Date
GB601847A true GB601847A (en) 1948-05-13

Family

ID=22027900

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25984/45A Expired GB601847A (en) 1944-10-10 1945-10-05 Improvements in or relating to ceramic materials

Country Status (4)

Country Link
AT (1) AT181234B (en)
FR (1) FR945571A (en)
GB (1) GB601847A (en)
NL (1) NL69638C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477136A1 (en) * 1980-02-29 1981-09-04 Mannesmann Ag REFRACTORY MATERIAL FOR MOLTEN STEEL MASS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477136A1 (en) * 1980-02-29 1981-09-04 Mannesmann Ag REFRACTORY MATERIAL FOR MOLTEN STEEL MASS

Also Published As

Publication number Publication date
FR945571A (en) 1949-05-09
NL69638C (en) 1952-02-16
AT181234B (en) 1955-02-25

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