Hot working of oxidisable metal or alloy billet - esp. of uranium alloy billet coated with glass to eliminate its oxidn. during extrusion

• Main Author: JEAN-NOEL ACH, DOMINIQUE MAILLOT, ROBERT PETITET ET CLAUDE PRUNIER
• Format: Patent
• Language: English; French
• Published: 09.11.1979
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; CHEMISTRY; FUELS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; LUBRICANTS; LUBRICATING COMPOSITIONS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PUNCHING METAL; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TRANSPORTING; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION

The billet is coated with glass which melts and is viscous at the hot working temp., followed by hot plastic deformation of the coated billet. The cold billet is pref. coated with glass powder, esp. a suspension of glass powder in alcohol or in water glass used as a binder; and after heating, the billet is worked, esp. by extrusion, and quenched in water to remove the glass. The billet is esp. a uranium alloy coated with glass to prevent its oxidn. during hot extrusion. The glass pref. contains the oxides of K, Ca, Al, B and Si; or the oxides of Na, Ca, Al, B, and Si, and the pref. plant includes a furnace in which the billet is heated in glass powder and is then transported to an extruder. Avoids the need for vacuum extrusion, which is a complicated process. L'invention a pour objet un procédé de transformation par déformation plastique à haute température d'une billette en métal ou alliage métallique oxydable et une installation de filage pour la mise en oeuvre de ce procédé. Ce procédé consiste à enrober ladite billette dans du verre fusible à ladite température de déformation, ledit verre présentant la propriété d'être visqueux à ladite température de déformation et ayant une composition telle qu'il ne puisse réagir chimiquement avec ledit métal ou ledit alliage à ladite température de déformation, à porter ladite billette enrobée à ladite température de déformation et à soumettre ensuite ladite billette enrobée et chauffée à ladite déformation plastique. Application au filage de l'uranium.