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

磁场旋转液体纺丝法生产非晶纤维

• 批准号: 08650879
• 负责人: SHIMAOKA Mitsuyoshi
• 金额: $ 1.28万
• 依托单位: NARA NATIONAL COLLEGE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650879/
• 关键词: RAPID SOLIDIFICATION; IN-ROTATING-LIQUID-SPINNING METHOD; AMORPHOUS FIBER; Nd-Fe-B PERMENENT MAGNET; MAGNETIC FIELD; ELECTROMAGNETIC FORCE; MATHEMATICAL MODELING; DIRECT CASTING; Nd-Fe-B磁石; 静磁場; Cu_<90>Be_<10>at%合金; 急冷凝固; 冷却速度; デンドライト2次アーム間隔

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.

在Nd-Fe-B永磁体相向形成的静磁场中进行了旋转液体自旋。用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>_<90>Be_<10>，Cu_<77.3>Be_<22.7>，Cu_<96>Al_4，Al_<92>Cu_8，Al_<97>Be_3原子%合金和纯Al进行了旋压实验。利用通电产生的电磁力对合金液射流进行主动控制。建立了在电磁力作用于转鼓径向的状态下，射流运动轨迹的数学模型。喷流轨道的计算结果与观测结果吻合较好。虽然铝射流在旋转液面上容易发生跳跃，但其跳跃是由电磁力控制的。然而，很难将射流深深地浸入液体中，因为随着电磁力的增加，仅射流对旋转液体的入射角增加。通过对Cu_<90>Be_合金射流<10>冷却过程的计算机模拟和所获得线材的二次枝晶臂间距的测量，研究了Cu_ Be_合金射流快速冷却的强化作用。随着电磁力的增加，射流的冷却速度加快，但不能得到非晶丝。在电流为800 mA或更大的情况下，焦耳热的增加阻碍了快速冷却。随着转鼓转速的增加，旋转液体中的二次流从转鼓底部向液面方向运动。据推测，这种二次流对射流的振荡有很大的影响。