| 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 t b = -190°C and a constant pressure of p b = 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 K max of said liquid nitrogen at 30m/s. During the time interval ”Ä; corresponding to different cooling rates V k , a guiding traction mechanism (6) at different continuous casting speed u pulls different lengths ”m 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. |
