PIECES REFRACTAIRES COMPOSITES ET PROCEDE POUR LEUR PRODUCTION PAR MOULAGE

• Main Author: MICHAEL ANTHONY ROBERTS ET MARTIN COPPERTHWAITE
• Format: Patent
• Language: French
• Published: 26.06.1981
• Subjects: ARTIFICIAL STONE; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; REFRACTORIES; SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER; SLAG; TRANSPORTING; TREATMENT OF NATURAL STONE; WORKING CEMENT, CLAY, OR STONE

UNE PLAQUE REFRACTAIRE 10 A ENVELOPPE METALLIQUE 11 POUR UNE VASE OU BUSETTE A TIROIR D'UNE POCHE OU D'UN PANIER DE COULEE (D'ACIER PAR EXEMPLE) COMPREND DEUX ELEMENTS REFRACTAIRES MOULES 26, 28, DONT LE PREMIER POSSEDE UNE PLUS GRANDE RESISTANCE AUX TEMPERATURES ELEVEES ET A L'ATTAQUE ET L'EROSION PAR LE METAL EN ECOULEMENT QUE LE SECOND. LA PLAQUE EST AINSI MOINS COUTEUSE, EGALEMENT EN RAISON DE LA SUPPRESSION DES MEULAGES DE MISE A DIMENSIONS APRES LA FABRICATION DE LA PLAQUE. LES DEUX ELEMENTS SONT SEPARES PAR UNE MINCE FEUILLE DE METAL 13 QUI S'OXYDE EN SERVICE ET FORME UN JOINT ENTRE LES MOULAGES 26 ET 28. Method for making a refractory valve is disclosed. The sliding gate valve slide plate in a can has an integral collector nozzle and is formed as two conjoined refractory concrete mouldings with a cup or trough shaped metal foil lying in the joint therebetween. The foil is oxidisable in service to form a bond between the concretes. The concretes may be of different formulations, and the moulding with which molten metal makes contact is preferably the more resistant to the rigorous environment presented by flowing molten metal. The slide plate is cast in two steps using the shaped foil and the can as respective lost mould members which coact with a planar polished surface to produce a cast slide plate needing effectively no finish grinding before installation in a valve.