SERVICE CHARACTERISTICS OF GRANULAR PERICLASE-SPINEL VIBRATION CASTABLES FOR THE PRODUCTION OF MELTING CRUCIBLES

摘要

Granular periclase-spinel vibration castables are studied. The range of their service characteristics (vibrating activity not less than 3 h) is determined depending on the type of dispersant: flow is 80-190% at 4.5-6.2% castable moisture for polyethyleneglycol dispersant, 80-180% at 5.2-6.5% castable moisture for polycarboxylic acid dispersant, and 80-190% at 5.5-7.0% castable moisture for polyelectrolyte dispersant. The range of service characteristics is assessed taking into account quality of the effective (melting) crucible surface. The studies have allowed the minimization of possible rejects during vibration casting and the production of high-refractory crucibles with smooth surface without defects to be used for induction melting of oxidation- and heat-resistant alloys.