Preparation method of ultrathin strip

The invention discloses a preparation method of an ultrathin strip. A rotary cooling roller melt-spinning device is adopted. Alloy liquid which is prepared according to alloy components and smelted evenly is sprayed downwards to the surface of a cooling roller rotating rapidly through a nozzle with a slit, the position deviating from the highest point of the cooling roller by an angle alpha in thedirection opposite to the rotating direction of the cooling roller is cooled rapidly, the ultrathin strip is formed, and the angle alpha ranges from 5 degrees to 45 degrees; and the method specifically comprises the following steps: (1) setting a strip spraying position on the cooling roller; (2) pouring alloy liquid; and (3) spraying the strip. The strip prepared by the method has the characteristics of sufficient toughness, small internal stress, small thickness, high flatness and the like. 本发明公开了一种超薄带材制备方法，采用一种旋转冷却辊甩带装置，将按照合金成分配料并熔炼均匀的合金液，经带有狭缝的喷嘴向下喷射到快速旋转的冷却辊表面上、从冷却辊最高点向冷却辊旋转的反方向偏离α角的位置处，经急速冷却，形成超薄带材，其中α角的度数为5°-4