METHOD OF PASSIVATION OF CONTACT SURFACE OF REFRACTORY RESERVOIR MADE FROM MULLITE AND SLIP USED FOR REALIZATION OF THIS METHOD

摘要

FIELD: production of metal alloys by casting.;SUBSTANCE: proposed method includes application of slip on contact surface; slip contains 50-70 mass-% of aluminum oxide powder Al₂O₃ and 30-50 mass-% of binder which contains 50-60 mass-% of aluminum chloride AlCl₃ dissolved in 40-50 mass-% of water. Then reservoir is dried and roasted in oxidizing atmosphere at temperature of 1450-15500°C for at least 20 min. In some cases, use is made of slip containing water-soluble organic dye. Used as organic dye is methylene blue at total content of 0.1-0.5 mass-%. Specification gives description of slip used for passivation of contact surface of refractory reservoir. Proposed method makes it possible to form absolutely inert coat on contact surfaces of ceramic reservoirs relative to alloys of titanium coat.;EFFECT: enhanced efficiency and reliability.;8 cl;EFFECT: