Manufacturing and property of Rapidly Solidified

研究了用熔融金属和快速凝固的铝合金薄片直接制成层压板的可能性。为了制造快速凝固的层压板，设计了两种工艺。一种是转盘工艺，另一种是转鼓工艺。层压板表面是否已经凝固影响层间界面的存在和层压板的冷却速度。在旋转圆盘过程中，熔融金属从旋转圆盘表面的喷嘴中连续喷射出来。磁盘速度为24和47m/s，磁盘材料为SUS304，狭缝喷嘴尺寸为0.5z20mm，喷嘴数量为1-7个。预凝固的金属在离心力的作用下飞走了。因此，经过一圈旋转后，喷嘴下方的自由表面已经凝固，层与层之间的界面清晰存在。层压板由50层以上的箔片组成，可采用转盘法铸造。可达到10^3 ~ 10^4个/s的冷却速率。各层的冷却速率差别不大。层压的抗拉强度约为300Pa。在弯曲引起的断裂段中，层合材料的各层在界面处不发生撕裂。尝试改进旋转圆盘工艺，使层压板达到百层以上，并设计了旋转滚筒工艺。在转鼓工艺中，熔融金属从转鼓内部的一个或多个喷嘴连续或间歇地喷射出来。转鼓速度为25m/s和50m/s，转鼓由铜制成。采用转鼓法制备了100余层复合材料。层厚为10- 50mm。层压板的冷却速率为10^3 ~ 10^5 /s。层之间的接口清晰存在。为了提高冷却速率，层的厚度必须变薄。不直接接触滚筒的层可以在10^3-10^5的冷却速率下快速凝固。顶板的凝固状态受顶板喷射喷嘴数量和喷射方式的控制。少

Possibility of making laminate, which is made directly from molten metal and the rapidly solidified aluminum alloy foils were laminated, was investigated in this study. To make rapidly solidified laminate, two types of processes were devised. One is rotationg disk process and the other is rotating drum process. The surface of the laminate is already solidified or not affects the existence of the interface between the layrs and cooling rate of the laminate. In the rotating disk process, molten metal is ejected continuously from nozzle on the rotating disk surface. The disk speed is 24 and 47m/s, disk material is SUS304, size of slit nozzle is 0.5z20mm and the number of nozzle is 1-7. Presolidified metal is flied off by the centrifugal force. So, free surface is already solidified below the nozzle after a revolution, and the interfaces between the layrs exist clearly. Laminate consists of more than 50 layrs of foils can be casted by rotating disk method. Cooling rate of lamination in the … More range of 10^3-10^4ﾟC/s is attained. There isn't much difference in cooling rate of each layr. Tensile strenght of lamination is about 300Pa. Each layr of the lamination isn't tore at interface in fractured section caused by bending. Rotating disk process was tried to improve to make laminate consists of more than a hundred of layrs, and rotating drum process was devised. In the rotating drum process, molten metal is ejected continuously or intermittently from a nozzle or multiple nozzles in the inside of the rotating drum. Drum speed is 25m/s and 50m/s and drum is made by copper. About more than 100 layrs were laminated by rotating drum process. Thickness of the layr is 10-50mum. Cooling rate in the laminate was 10^3-10^5ﾟC/s. Interfaces between layrs exist clearly. To make cooling rate higher, thickness of the layr has to be thinner. The layr which doesn't directly contact to drum can be rapidly solidified at the cooling rate of 10^3-10^5ﾟC/s. The solidified condition of the top layr is controlled by number of ejection nozzle and ejection pattern. Less