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Electromagnetic Generation of Compression Waves in a Liquid Metal

液态金属中电磁产生压缩波

基本信息

批准号：
10211204
负责人：
IWAI Kazuhiko
金额：
$ 21.89万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

项目摘要

Compression waves have attractive functions in liquid metal processes such as refinement of solidified structure, degassing, promotion of reaction rate and so on. However, they have not been used in industry because of the power limitation of electrostrictive or magnetostrictive vibrators, dissolution of power transmitter contacting with a liquid metal. On the other hand, compression waves can also be excited in a liquid metal by using an electromagnetic field. This method can solve problems mentioned above. That is, we can excite large power compression waves under non-contacting operation. In this research, electromagnetic excitation methods of compression waves have been proposed and industrially useful function of compression waves excited by the proposed method in solidification processing has been demonstrated in the experiment. One of the excitation method proposed here is the simultaneous imposition of a static magnetic field and an alternating magnetic field on a liquid metal … More and the other one is the simultaneous imposition of a static magnetic field and an alternating electric current. In both cases, excitation of compression waves was theoretically and experimentally confirmed. Furthermore, refined macrostructure of the Sn-Pb alloy was obtained under the imposition of compression waves excited by the latter method during solidification.Alfven waves have been mainly studied in the field of astrophysics since it was very difficult to excite on the earth. However, under the development of super conducting technology, we can excite them in a liquid metal. Therefore, Alfven waves have a possibility as a process control tool. Here, excitation method of Alfven waves in a liquid metal has been investigated theoretically and experimentally. Pressure distribution accompanying Alfven waves in a liquid metal was theoretically derived and it was compared with the measured pressure in the metal. The both results shows a good agreement. Then, the newly proposed method is useful to excite Alfven waves. Furthermore, refined macrostructure of the Sn-Pb alloy was obtained under the imposition of Alfven waves during its solidification. Less

压缩波在液态金属加工中具有细化凝固组织、除气、促进反应速率等诱人的功能，但由于电致伸缩或磁致伸缩振子的功率限制，以及与液态金属接触的功率传感器的溶解等原因，压缩波在工业上尚未得到应用。另一方面，也可以通过使用电磁场在液态金属中激发压缩波。该方法可以解决上述问题。也就是说，我们可以在非接触操作下激发大功率压缩波。本研究提出了压缩波的电磁激励方法，并通过实验验证了该方法在凝固过程中所激发的压缩波的工业实用功能。本文提出的激励方法之一是在液态金属上同时施加静磁场和交变磁场 ...更多信息另一种是同时施加静磁场和交变电流。在这两种情况下，理论和实验都证实了压缩波的激发。此外，在凝固过程中施加压缩波，还可以得到细化的Sn-Pb合金的宏观组织。Alfven波在地球上很难激发，因此主要在天体物理领域进行研究。然而，随着超导技术的发展，我们可以在液态金属中激发它们。因此，阿尔芬波有可能作为过程控制工具。本文从理论和实验上研究了液态金属中阿尔芬波的激发方法。从理论上推导了液态金属中阿尔文波的压力分布，并与实测压力进行了比较。两个结果显示出良好的一致性。因此，新提出的方法是有用的激发阿尔芬波。此外，在凝固过程中施加Alfven波，可使Sn-Pb合金的宏观组织得到细化。少