Method of manufacturing high strength glass fibers in a...

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 3/087 (2006.01) C03B 5/04 (2006.01) C03B 5/235 (2006.01) C03B 7/06 (2006.01) C03C 3/085 (2006.01) C03C 3/091 (2006.01) C03C 13/00 (2006.01) F23C 5/02 (2006.01) F23D 14/22 (2006.01)

Patent

CA 2748000

A method of forming high strength glass fibers in a glass melter substantially free of platinum or other noble metal materials, products made there from and batch compositions suited for use in the method are disclosed. One glass composition for use in the present invention includes 50-75 weight % SiO2, 13-30 weight % Al2O3, 5-20 weight % MgO, 0- 10 weight % CaO, 0 to 5 weight % R2O where R2O is the sum Of Li2O, Na2O and K2O, has a higher fiberizing temperature, e.g. 2400 - 2900° F (1316--1593 ° C) and/or a liquidus temperature that is below the fiberizing temperature by as little as 45 ° F (25° C). Another glass composition for use in the method of the present invention is up to about 64- 75 weight percent SiO2, 16-24 weight percent Al2O3, 8-12 weight percent MgO and 0.25-3 weight percent R2O, where R2O equals the sum Of Li2O, Na2O and K2O, has a fiberizing temperature less than about 2650° F (1454 ° C), and a .DELTA.T of at least 80° F (45 ° C). A forehearth (12) for transporting molten glass from the glass melter (10) to a forming position is disclosed. By using furnaces and/or forehearths substantially free of platinum or other noble metal materials, the cost of production of glass fibers is significantly reduced in comparison with the cost of fibers produced using a melting furnace lined with noble metal materials. High strength composite articles including the high strength glass fibers are also disclosed.

La présente invention concerne un procédé de fabrication de fibres de verre de haute résistance dans un four de fusion du verre ne contenant quasiment pas de platine ni d'autres métaux nobles, des produits formés à partir de ces fibres, et des compositions avantageusement utilisées dans le procédé. Une composition de verre de l'invention comprend, en pourcentage pondéral, 50-75 % de SiO2, 13-30 % d'Al2O3, 5-20 % de MgO, 0-10 % de CaO et 0-5 % de R2O où R2O est la somme de Li2O, Na2O et K2O, et a une température de fibrage élevée, par exemple de 2400 - 2900 °F (1316 - 1593 °C) et/ou une température de liquidus inférieure à la température de fibrage de seulement 45 °F (25 °C). Une autre composition de verre de l'invention comprend, en pourcentage pondéral, jusqu'à environ 64-75 % de SiO2, 16-24 % d'Al2O3, 8-12 % de MgO et 0,25-3 % de R2O où R2O est la somme de Li2O, Na2O et K2O, et a une température de fibrage inférieure à 2650 °F (1454 °C) et un ?T d'au moins 80 °F (45 °C). L'invention concerne également un avant-corps (12) pour transporter du verre fondu depuis le four de fusion (10) jusqu'à une position de formage. En utilisant des fours et/ou des avant-corps ne contenant quasiment pas de platine ni d'autres métaux nobles, le coût de production des fibres de verre est sensiblement réduit par rapport au coût des fibres produites dans un four de fusion à garniture en métal noble. L'invention concerne également des articles composites de haute résistance comprenant les fibres de verre ci-décrites.

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