Method for propagating vibration into a conductive fluid and method for solidifying a melted metal using the same propagating method of vibration
a technology of conductive fluid and propagating method, which is applied in the direction of mechanical vibration separation, chemical/physical/physical-chemical process, energy-based chemical/physical/physical-chemical process, etc., can solve the problem of contaminating the liquid metal, affecting the mechanical performance of the whole of the huge vessel, and restricting the amplitude of the vibration to be applied
Inactive Publication Date: 2004-04-08
NAGOYA UNIVERSITY
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- Application Information
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Benefits of technology
The present invention relates to a method for propagating vibration into a conductive fluid, such as a liquid metal, for solidification purposes. The method uses an electromagnetic force to generate and propagate a transverse wave in the conductive fluid, which can be easily applied on a large industrial scale. The method can control the size of the solidification structure and promote fine grain formation. It is a new and effective method for solidifying liquid metals.
Problems solved by technology
On large industrial scale, however, it is difficult to vibrate the whole of a huge vessel mechanically.
However, if such a magnetostrictive oscillator or an electrostrictive oscillator is employed, it may be melted or destroyed in the liquid metal, to contaminate the liquid metal.
Also, the amplitude of the vibration to be applied is restricted due to the limitation of the output power level of the oscillator.
As a result, a method for propagating vibration into a liquid metal is not be developed particularly on the large industrial scale, at present.
Therefore, without a large-scale apparatus, the vibration can be easily generated in the conductive fluid.
In this case, the size of the solidification structure can be controlled unrestrainedly, and thus, the solidification structure can be easily fined.
Therefore, the Alfven wave is not almost utilized in the industrial field.
Method used
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[0028] In this example, such an apparatus as shown in FIG. 1 was employed, and an alloy having a composition of Sn-10 mol % Pb (hereinafter, called as a "SnPb alloy") was melted and then, solidified. In the apparatus shown in FIG. 1, a cylindrical vessel 1 (internal diameter: 30 mm, height: 150 mm) made of glass is employed, and electrodes 2-1 and 2-2 (each width: 10 mm, each thickness: 2 mm) made of Cu are disposed in the vessel 1 so as to be opposite to one another. Also, an external AC power supply 3 is connected to the ends of the electrodes 2-1 and 2-2. The vessel 1 including the electrodes 2-1 and 2-2 is placed in a super conductive magnet (not shown).
[0029] A SnPb alloy 4 melted was charged in a depth of 120 mm in the vessel 1, and then, the electrodes 2-1 and 2-2 were immersed in the melted SnPb alloy 4 by a length of 20 mm, respectively. Then, a magnetic field of a strength of 8T was applied from the super conductive magnet (not shown) and an AC electric field of a frequenc...
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Abstract
A given magnetic field and a given wave are applied to a conductive fluid so as to satisfy the relations of: l⊥>delta (1) lambda''>lambda (2) on condition that a length of said conductive fluid is set to l⊥(m), and the equations of delta=(2 / Pmuomega)<1 / 2 >and lambda''=2piB / omega(rhomu)<1 / 2 >are defined (sigma: the electric conductivity (S / m) of said conductive fluid, rho: the density (kg / m<3>) of said conductive fluid, mu: the permeability of said conductive fluid, B: the strength of said magnetic field (T), omega: the angular frequency of said wave), thereby to generate and propagate a given vibration into said conductive fluid.
Description
[0001] 1. Field of the Invention[0002] This invention relates to a method for propagating vibration into a conductive fluid and a method for solidifying a melted metal using the same propagating method of vibration.[0003] 2. Description of the Prior Art[0004] The control of solidification structure and the refinement can be performed effectively by applying vibration into the melted liquid metal to be solidified. For example, it is well known that solidification process is started by applying mechanical impact to a supercooled liquid metal. It is also well known that fine structure can be created by applying vibration to a melted liquid metal during solidification and degasifying process is promoted by applying compress ional wave to a melted liquid metal.[0005] On laboratory scale, by applying a given mechanical vibration to the whole of a vessel where a liquid metal is charged, a given vibration can be easily applied to the liquid metal. On large industrial scale, however, it is d...
Claims
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IPC IPC(8): B06B1/20B01J19/06B01J19/08B22D27/02C22B9/02C22B25/08H02K44/04
CPCB01J19/06B01J19/087B22D27/02H02K44/04C22B9/026C22B25/08C22B9/02Y02P10/20B06B1/20
Inventor IWAI, KAZUHIKOASAI, SHIGEOMOREAU, RENE
Owner NAGOYA UNIVERSITY