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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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15-08-1978 дата публикации

Manufacture of improved fused cast refractory

Номер: US0004107255A1
Автор: Clishem; Thomas A., Olympia; Frederick D., Pokallus; Leonard W.
Принадлежит: Corning Glass Works

Basic fused cast refractory with principal crystal phases of periclase and magnesium-spinel is made by adding nonfused oxidic inorganic grog particles to molten mass of the refractory as it is cast into a mold cavity, thereby resulting in increased modulus of rupture at temperature in the range of about 1340°-1500° C. and avoidance of shell formation. Molten mass has a composition consisting essentially (by weight) of 45-78% MgO, 0-30% Cr2 O3, 0-35% Al2 O3, 0-17% FeO + Fe2 O3, at least 82% MgO + Cr2 O3 + Al2 O3 + FeO + Fe2 O3, 1-8% SiO2, 0-2% CaO + BaO + SrO2, 0-10% TiO2 and 0-3% fluorine. Nonfused particles have a loss on ignition at 1000° C. of less than about 0.5% by weight and an aggregate SiO2 content at least about equal to the SiO2 content of the molten mass forming the cast refractory. Grog particles are of a size (e.g., within the range of particles passing about 25 mm. sieve openings and retained by about 0.5 mm sieve openings) and in an amount (e.g., about 2.5 to 70% by weight ...

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Номер записи: 1
21-11-1972 дата публикации

Electric melting furnace and process of using it

Номер: US3703391A
Автор: Francis R Duerr, Frederick D Olympia, Thomas A Clishem
Принадлежит: Corhart Refractories Corp

FURNACE HAS CARBON ELECTRODES SUSPENDED IN A REFRACTORY-LINED MELTING POT WITH A TAP HOLE IN THE MIDDLE OF A FRONT WALL PORTION THEREOF. A WATER-COOLED COPPER LANCE SEALABLY AND REMOVABLY ENGAGES THE TAP HOLE FOR INJECTING REACTIVE GAS INTO A MOLTEN CHARGE IN THE POT. THE LANCE HAS A TAPERED PORTION FOR SEALABLY ENGAGING THE WALLS OF THE TAP HOLE AND HAS A STUBBY END AS THE ONLY PART THEREOF PROTRUDING INSIDE OF AND FACING INTO THE POT. THE STUBBY END HAS A PLURALITY OF JET ORIFICES FOR DISCHARGING REACTIVE GAS, WHICH ORIFICES HAVE AXES DISPOSED AT AN ACUTE DOWNWARD ANGLE FROM THE HORIZONTAL AND IN A DIVERGENT FANLIKE PATTERN IN THE DIRECTION OF GAS FLOW IN THE LANCE. FURNACE IS OPERATED TO PRODUCE MOLTEN OXIDIC REFRACTORY MATERIAL BY PROVIDING A SHALLOW POOL OF THAT MOLTEN MATERIAL IN THE POT, ELECTRICALLY MELTING FURTHER OXIDIC REFRACTORY MATERIAL BY MEANS OF THE ELECTRODES TO ENLARGE THE POOL, ENGAGING THE WATER-COOLED LANCE IN THE TAP HOLE AND CAUSING REACTIVE GAS E.G. OXYGEN, TO FLOW FROM THE LANCE INTO THE POT, TILTING THE FURNACE FORWARD TO CAUSE THE POOL SURFACE TO RISE ABOVE THE TAP HOLE AND TO EFFECT INJECTION OF GAS INTO THE POOL WITH STIRRING THEREOF, THEN BACK-TILTING THE FURNACE AFTER A PREDETERMINED TIME OF LANCING, DISCONTINUING FLOW OF THE GAS AND REMOVING THE LANCE FROM THE TAP HOLE IN PREPARATION FOR FUSION-CASTING THE POOL.

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Номер записи: 2