GB980975A - Improvements in or relating to methods of forming metallized surfaces on ceramic bodies - Google Patents

Improvements in or relating to methods of forming metallized surfaces on ceramic bodies

Info

Publication number
GB980975A
GB980975A GB3538562A GB3538562A GB980975A GB 980975 A GB980975 A GB 980975A GB 3538562 A GB3538562 A GB 3538562A GB 3538562 A GB3538562 A GB 3538562A GB 980975 A GB980975 A GB 980975A
Authority
GB
United Kingdom
Prior art keywords
temperature
glass
becomes
mobile liquid
firing
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
GB3538562A
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.)
DONALD FREDERICK DAILLY
MO Valve Co Ltd
Original Assignee
DONALD FREDERICK DAILLY
MO Valve Co Ltd
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 DONALD FREDERICK DAILLY, MO Valve Co Ltd filed Critical DONALD FREDERICK DAILLY
Priority to GB3538562A priority Critical patent/GB980975A/en
Publication of GB980975A publication Critical patent/GB980975A/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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
    • C04B41/5133—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal with a composition mainly composed of one or more of the refractory metals
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
    • C04B41/5183—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal inorganic
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/88—Metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

A metallized surface is imparted to a ceramic body (e.g. one of 98% by wt. of alumina, beryllia or a mixture of alumina and beryllia) by coating at least a portion of the surface of the body with a mixture of powdered metal (of which the major part may be molybdenum and/or tungsten) and powdered glass, the powdered glass constituting not more than 30% by weight of said mixture, and having a coefficient of thermal expansion comparable with that of the body, the lowest temperature at which appreciable sintering of the powdered metal occurs lying between the temperature at which the glass becomes a mobile liquid and the temperature at which the body becomes a mobile liquid, and then subjecting the coated body to two consecutive periods of firing during the first of which the firing temperature has a value between the temperature at which the glass becomes a mobile liquid and the lowest temperature at which appreciable sintering of the powdered metal occurs, and during the second of which the firing temperature has a value between said lowest temperature of sintering and the temperature at which the body becomes a mobile liquid. The glass used may have a composition by weight of SiO2 10%; Al2O3 37.1%; CaO 45.9%; MgO 5.0%; SrO 2%; or may be a lime-alumina-silica or magnesia-alumina-silica glass exhibiting a gehlenite structure when devitrified. The first-mentioned glass becomes a mobile liquid at a temperature of 1400 DEG C. and has a coefficient of thermal expansion of 8.97 x 10-6 per DEG C. The lowest temperature of sintering of molybdenum is 1450 DEG C., and the temperature at which a body of 99.5% alumina becomes a mobile liquid is about 2000 DEG C. The firing for this combination would be ten minutes at 1430 DEG C. and five minutes at 1600 DEG C. Firing is in an atmosphere of pure hydrogen.ALSO:A metallized surface is imparted to a ceramic body (e.g. one of 98% by weight of alumina, beryllia or a mixture of alumina and beryllia) by coating at least a portion of the surface of the body with a mixture of powdered metal (of which the major part may be molybdenum and/or tungsten and the minor part manganese, iron, nickel or palladium) and powdered glass, the powdered glass constituting not more than 30% by weight of said mixture, and having a coefficient of thermal expansion comparable with that of the body, the lowest temperature at which appreciable sintering of the powdered metal occurs lying between the temperature at which the glass becomes a mobile liquid and the temperature at which the body becomes a mobile liquid, and then subjecting the coated body to two consecutive periods of firing during the first of which the firing temperature has a value between the temperature at which the glass becomes a mobile liquid and the lowest temperature at which appreciable sintering of the powdered metal occurs, and during the second of which the firing temperature has a value between said lowest temperature of sintering and the temperature at which the body becomes a mobile liquid. A mixture comprising 90% molybdenum and 10% of a glass exhibiting a gehlenite structure when devitrified may be used (e.g. a glass SiO2 10% ; Al2O3 37.1% ; CaO 45.9% ; HgO 5.0% ; SrO 2.0%). The glass mentioned becomes a mobile liquid at 1400 DEG C. and has a coefficient of expansion of 8.47 x 10-6 per DEG C. The lowest temperature of sintering of the molybdenum is 1450 DEG C. and the temperature at which a body of 99.5% alumina becomes a mobile liquid is about 2000 DEG C. The firing for this combination would be ten minutes at 1430 DEG C. and five minutes at 1600 DEG C. The firing is done in an atmosphere of hydrogen.
GB3538562A 1962-09-17 1962-09-17 Improvements in or relating to methods of forming metallized surfaces on ceramic bodies Expired GB980975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3538562A GB980975A (en) 1962-09-17 1962-09-17 Improvements in or relating to methods of forming metallized surfaces on ceramic bodies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3538562A GB980975A (en) 1962-09-17 1962-09-17 Improvements in or relating to methods of forming metallized surfaces on ceramic bodies

Publications (1)

Publication Number Publication Date
GB980975A true GB980975A (en) 1965-01-20

Family

ID=10377151

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3538562A Expired GB980975A (en) 1962-09-17 1962-09-17 Improvements in or relating to methods of forming metallized surfaces on ceramic bodies

Country Status (1)

Country Link
GB (1) GB980975A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230675A2 (en) * 1986-01-27 1987-08-05 Hitachi, Ltd. Ceramic wiring substrate and process for producing the same
WO1988003919A1 (en) * 1986-11-26 1988-06-02 Ceramics Process Systems Corporation Tungsten paste for co-sintering with pure alumina and method for producing same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0230675A2 (en) * 1986-01-27 1987-08-05 Hitachi, Ltd. Ceramic wiring substrate and process for producing the same
EP0230675A3 (en) * 1986-01-27 1990-04-25 Hitachi, Ltd. Ceramic wiring substrate and process for producing the same
WO1988003919A1 (en) * 1986-11-26 1988-06-02 Ceramics Process Systems Corporation Tungsten paste for co-sintering with pure alumina and method for producing same
US4835039A (en) * 1986-11-26 1989-05-30 Ceramics Process Systems Corporation Tungsten paste for co-sintering with pure alumina and method for producing same

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