A method for manufacturing a galvannealed vacuum evaporated steel sheet having uniform evaporation thickness distribution using a large-capacity resistance heating evaporation source and evaporation source

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-capacity resistance heating evaporation source for application to continuous vacuum deposition of strips such as steel strips and a manufacturing method of a steel sheet using the evaporation source. More specifically, the evaporation source of the present invention is used for depositing a material having a low melting point and exhibiting a high vapor pressure even at a low temperature, such as zinc (Zn) and magnesium (Mg) It is possible to obtain a uniform deposition amount on the surface of the steel strip irrespective of the position of the steel strip.;Precise control in the evaporation source for vacuum deposition is required in two ways: one is to accurately control the deposition amount of the plating, and the other is to uniformly control the distribution of the deposition amount on the material. The temperature of the graphite crucible 7 is controlled and controlled for precise control of the deposition amount of the plating, and the distribution of the deposition amount of the plating adhered to the work is controlled by the cover 1 of the evaporation source.