Method of retarding the cooling of molten metal

US4181522A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Jean-Baptiste Galey · Saint-Jean-d'Angély, FR
• Gerard Bentz · Trappes, FR
• Pierre Karinthi · Vélizy-Villacoublay, FR
• Ghislain Gilbert · Les Ulis, FR
• Serge Devalois · Saint-Germain-en-Laye, FR

Key dates

• Filing date: Jan 23, 1978
• Grant date: Jan 1, 1980
• Expiry date: Jan 23, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22D11/106
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The cooling of molten metal, such as metal continuously cast into an ingot mold, is retarded by establishing on the upper surface of the metal in the mold, a layer of cryogenic liquid such as nitrogen, helium or argon, with a finely divided material in homogeneous and stable suspension in the liquid. The finely divided material is in the form of particles having a size between 200 and 2,000 A and is present in a quantity between 10 and 1,000 grams per liter of cryogenic liquid. The suspended material may be aluminum, titanium, zirconium, niobium, calcium, lithium, magnesium, solid glass, or an oxide of aluminum, titanium, zirconium, niobium, calcium, lithium or magnesium, and is highly reflective to infrared radiation from the metal so as to reduce the transparency of the cryogenic liquid to this infrared radiation.