L, R, C METHOD AND EQUIPMENT FOR CONTINUOUS CASTING AMORPHOUS, ULTRACRYSTALLITE AND CRYSTALLITE METALLIC SLAB OR STRIP

摘要

This invention discloses an L,R,C method and equipment for casting amorphous, ultracrystallite and crystallite metal slabs or other shaped metals. A workroom (8) with a constant temperature of tb = -190°C and a constant pressure of pb = 1 bar, and liquid nitrogen of -190°C and 1.877 bar is used as a cold source for cooling the casting blank. A liquid nitrogen ejector (5) ejects said liquid nitrogen to the surface of ferrous or non-ferrous metallic slabs or other shaped metals (7) with various ejection quantity v and various jet velocity k. Ejected liquid nitrogen comes into contact with the casting blank at cross section c shown in figure 2. This method adopts ultra thin film ejection technology, with a constant thickness of said film at 2mm and ejection speed Kmax of said liquid nitrogen at 30m/s. During the time interval Δτ; corresponding to different cooling rates Vk, a guiding traction mechanism (6) at different continuous casting speed u pulls different lengths Δm of metal from the outlet of the hot casting mould (4). Under the action of heat absorption and gasification of ejected liquid nitrogen, molten metal is solidified and cooled rapidly to form an amorphous, ultracrystallite or crystallite metal structure.