CONTINUOUS CASTING MOLD AND FORMATION OF THERMALLY SPRAYED FILM ON INSIDE SURFACE OF MOLD

摘要

PURPOSE:To obtain a continuous casting mold having a long life with decreased burn-on-sand and exfoliation by specifying a thermal spraying material and the particle flying speed of the thermal spraying material. CONSTITUTION:A ceramic thermal spraying material such as Al2O3 or a composite thermal spraying material composed of metals or the alloy thereof such as 85% WC-15% Co, 80% Cr3C2-20% NiCr alloy contg. >=60% ceramics is used for the thermal spraying material. Said material is thermally sprayed to the inside surface of the casting mold by a high power plasma spraying method or explosive spraying method in such a way that the particle flying speed of the thermal spraying material attains >=400m/sec. The inside surface of the casting mold is preliminarily subjected to Ni plating or a surface treatment in which an Ni- W-Fe alloy is plated on said Ni plating for at least a 1/2 region from the lower part. The thermally sprayed film having excellent resistance to burn-on-sand, heat and wear is formed on the inside surface of the casting mold and the life of the casting mold is extended.