| 摘要 |
PROBLEM TO BE SOLVED: To obtain the sufficiently slow cooling effect in the whole casting operational period without damaging the slow cooling layer at early time by coating a film dispersed with stabilized zirconia fine particles in a matrix composed of a hard metal or cermet at the portion near the poured molten metal surface on the inner wall surface of a mold. SOLUTION: The mold 1 is formed with an Ni Co plated layer 3 as a substrate surface treatment on the whole wall surface of a copper-made wall member 2 and further, on the surface of the Ni Co plated layer at the upper side of the inner wall surface, the film 4 dispersed with the stabilized zirconia fine particles in the matrix composed of WC/Co, is formed with a thermal-spraying method. The thickness of the film 4 is made to, e.g. 500μm and the film is formed in the range from 50 mm the upper side to 100 mm the lower side with the molten metal surface position 5 as the center. In this method, the sufficiently slow cooling effect is obtd. without damaging the film 4 as the slow cooling layer at early time and the defect, such as longitudinal crack, on the surface of a cast slab is not generated and the component segregation produced along the solidified line caused by the oscillation of the mold is restrained.
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