PRODUCTION OF AMORPHOUS FIBER BY IN-ROTATING-LIQUID-SPINNING METHOD IN MAGNETIC FIELD

在Nd-Fe-B永磁体面对面形成的静磁场中进行了自旋液体旋压。纺丝试验用锡膏74.8&gt；铅膏25.2&gt；锡铅膏68.7&gt；铅铅膏24.3&gt；铋铅膏68.1&gt；锌粉31.9&gt；铜粉90&gt；锡膏10&gt；铜粉15&gt；96&gt；Be_4，Cut_&lt；90&gt；Be_&lt；10&gt；，Cut_&lt；77.3&gt；Be_&lt；22.7&gt；，Cut_&lt；96&gt；Al_4，Al_&lt；92&gt；Cu8，Al_&lt；97&gt；Be_3at%合金和纯铝。锡铅和锡铅铋合金熔体射流可以使用直径0.05 mm的石英喷嘴进行喷射。通过给射流通电产生的电磁力，主动控制了熔融合金射流的流动。建立了对转鼓半径方向施加电磁力状态下射流轨迹估算的数学模型。计算得到的喷流轨道与观测结果吻合较好。虽然铝射流在旋转的液体表面很容易跳跃，但射流的跳跃是由绕转鼓半径方向的电磁力控制的。然而，由于只有射流对旋转液体的入射角随着电磁力的增大而增大，因此很难将射流深入液体中。通过对喷射冷却过程的计算机模拟和对得到的线材二次枝晶间距的测量，验证了Cu90&gt；Be&lt；10&gt；合金喷射快速冷却的强化作用。随着电磁力的增大，射流冷却速度加快，但不能得到非晶态丝材。当电流大于或等于800 mA时，焦耳热的增加阻碍了快速冷却。随着转鼓速度的增加，旋转液体中的二次流从转鼓底部向液面发展。据推测，这种二次流对喷流的抖动有很大影响。

In-Rotating-Liquid-Spinning has been performed in magnetostatic field formed with Nd-Fe-B permanent magnets facing each other. Spinning experiments have been done by the use of Sn_<74.8>Pb_<25.2>, Sn_<68.7>Pb_<24.3>Bi_<7, >Cu_<68.1>Zn_<31.9>, Cu_<90>Sn_<10>, Cu_<85>Sn_<15>, Cu_<96>Be_4, Cu_<90>Be_<10>, Cu_<77.3>Be_<22.7>, Cu_<96>Al_4, Al_<92>Cu_8, Al_<97>Be_3 at% alloys and Pure Al. Sn-Pb and Sn-Pb-Bi alloy melt jets were able to eject using a quartz nozzle of 0.05mm diameter. Molten alloy jet flow has been controlled actively with the electromagnetic force generated by turning on electricity to the jet. The mathematical model to estimate the jet orbit at the state with the electromagnetic force to the drum radius direction has been developed. The calculated jet orbits agreed well with the observed results. Although aluminium jet was easy to jump at the rotating liquid surface, the jump of the jet was controlled by the electromagnetic force to drum radius direction. However, it was difficult to dip the jet deeply into the liquid, because only the incidence angle of the jet to the rotating liquid increased with increasing electromagnetic force. The enhancement of the rapid cooling of the Cu_<90>Be_<10> alloy jet has been examined by the computer simulation of the cooling of the jet and by the measurement of the secondary dendrite arm spacing of the obtained wire. The cooling rate of the jet was increased with increasing the electromagnetic force, but the amorphous wires could not obtain. In case of electric current of 800mA or more, the rapid cooling was obstructed by increase of Joule's heat. The secondary flow in the rotating liquid seveloped toward the liquid surface from the bottem of drum with increasing drum velocity. It was presumed that this secondary flow had a great influence on the shaking of the jet.