METHOD FOR WORKING CASTABLE REFRACTORY

• Main Authors: NANBU MASATO, YAMAGUCHI TOYOHIDE, IIDA MASAKAZU, KIYOTA SADAKIMI, KUMAGAI MASATO, KOMATSUBARA NOBORU
• Format: Patent
• Language: English
• Published: 09.11.1999
• Edition: 6
• Subjects: ARTIFICIAL STONE; BLASTING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FURNACES; HEATING; KILNS; LIGHTING; LIME, MAGNESIA; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; OVENS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; REFRACTORIES; RETORTS; SLAG; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF NATURAL STONE; WEAPONS

PROBLEM TO BE SOLVED: To effectively prevent the defect of a worked body caused by the explosion at the time of drying and the mechanical damage at the time of removing a core, etc., by casting a castable refractory containing a specific quantity of alumina cement into a worked frame space and removing moisture at a specific temp. after curing at a specific temp. SOLUTION: At the time of working the lining refractory on the inner wall surface of a torpedo car, a backup refractory, such as chamotte brick, is worked along an iron shell and the core is set in the inner side of this car to form a casting space. The castable refractory is cast into this space. This castable refractory contains 0.5-8 wt.% alumina cement and as the other, specific quantities of SiC, artificial graphite, pitch, etc. After casting work, the core and the inside of the car are heated and the castable refractory is heated at 30-80 deg.C and cured for about 30-80 hrs. Thereafter, desirably, the core is removed and the castable refractory is heated to >=100 deg.C by using a burner, etc., to remove the moisture and dry the castable refractory.