JPH0622962Y2 - Magnetic fluid manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnetic fluid manufacturing apparatus, and more particularly, to a magnetic fluid containing a surfactant, vapor generated by heating and evaporating a ferromagnetic substance by a heating device. The present invention relates to an apparatus for producing a magnetic fluid, which is brought into contact with a liquid serving as a solvent to be condensed.

[Prior art]

FIG. 3 shows a conventional magnetic fluid manufacturing apparatus of this type.

In this device, both ends of a cylindrical member 23 are provided on the outer circumference of a horizontal cylindrical body 22 having an opening 21 formed at the center of the upper portion of a flange 2
Both end boss portions 2 of the cylindrical drum 25 held by 4, 24
6, 26 are supported airtightly and rotatably via O-rings 27, 27, and have a cylindrical body 22 and a cylindrical drum 25.
The inside of the cylinder is sucked from one end of the cylindrical body 22, exhausted, and maintained in a high vacuum.

A hollow tubular support member 29, 2 is provided at the other end of the cylindrical body 22.
The outer end of 9 is fixed, the electrodes 30, 30 are fixed to the inner ends of the support members 29, 29, and both ends of a heater 32 wound around the outer periphery of the crucible 31 are supported by both electrodes 30, 30. As a result, the crucible 31 is arranged at the position where the opening 21 is formed in the cylindrical body 22, and the ferromagnetic material 33 accommodated in the crucible 31 is accommodated.
The electric current applied between the electrodes 30 and 30 from the outside through the hollow tubes of the support members 29 and 29 is heated and evaporated by flowing through the heater 32.

A liquid 34 containing a surfactant and serving as a solvent for the magnetic fluid is contained in the bottom of the cylindrical drum 25, and the liquid 34 adheres to the inner peripheral surface of the cylindrical drum 25 as a film as the cylindrical drum 25 rotates. As a result, the ferromagnetic substance 33 vaporizes from the crucible 31 above the crucible 31 and comes into contact therewith to condense.

Then, by contacting and condensing the vapor of the ferromagnetic substance 33 and the liquid 34 for a required time, a magnetic fluid having a large magnetization can be obtained.

[Problems to be solved by the invention]

However, in such a conventional device, the second
As shown in the figure, impurities (mainly oxides with a high melting point) 33b are present on the surface of the melt 33a of the ferromagnetic material 33 filled in the heated crucible 31, and these are collected to form a film gradually. And melt 3 of ferromagnetic material 33
A melt 33a of ferromagnetic material 33 to cover the surface of 3a.
However, there is a problem that the evaporation rate is reduced and the evaporation rate is reduced, so that the evaporation cannot be performed in an extreme case.

This invention solves the problems of the conventional ones described above, and provides a magnetic fluid manufacturing apparatus capable of preventing a decrease in deposition rate and shortening the deposition time by improving the deposition rate. It is intended to be provided.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is to provide a ferromagnetic material made of a ferromagnetic metal element or a ferromagnetic compound in a horizontal cylindrical container whose inside is a high vacuum or low pressure inert gas or oxygen gas atmosphere. And a liquid containing a surfactant and containing a liquid serving as a solvent for the magnetic fluid, and rotating the horizontal cylindrical container around its axis to coat the liquid on the inner peripheral surface thereof. A magnetic fluid manufacturing apparatus configured to contact and condense the vapor of the ferromagnetic substance vaporized by the heating evaporation device while forming Is.

[Action]

This invention adopts the above-mentioned means, so that the heating-evaporating device vibrates by the vibrating means, and this vibration stirs the ferromagnetic substance, which does not hinder the evaporation of the ferromagnetic substance. The evaporation of the ferromagnetic material will be promoted.

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 shows an embodiment of a magnetic fluid manufacturing apparatus according to the present invention. This manufacturing apparatus has an opening 1 at an upper center.
It is provided with a horizontal cylindrical body 2 in which is formed.

On the outer circumference of the cylindrical body 2, both end boss portions 6, 6 of a cylindrical drum 5 in which both ends of a Pyrex glass cylindrical member 3 are held by metal flanges 4, 4 are hermetically sealed via O-rings 7, 7. And rotatably supported by the deep groove ball bearings 8 and 8, the insides of the cylindrical body 2 and the cylindrical drum 5 are suctioned and exhausted from the right end of the cylindrical body in the figure to be maintained in a high vacuum. There is.

The outer ends of the hollow tubular support members 9 and 9 are fixed to the left end of the cylindrical body 2 in the figure, and the electrodes 10 and 10 are fixed to the inner ends of the support members 9 and 9. 10, both ends of a tungsten wire heater 12 wound around an alumina crucible 11 are supported, whereby the crucible 1
1 is arranged at a position where the opening 1 is formed in the cylindrical body 2, and the crucible 1
The ferromagnetic substance 13 accommodated in 1 is heated and evaporated by the electric current applied from the outside between the electrodes 10 and 10 through the heater 12 through the hollow tubes of the support members 9 and 9.

A liquid 14 containing a surfactant and serving as a solvent for the magnetic fluid is contained in the bottom of the cylindrical drum 5, and the liquid 14 forms a film on the inner peripheral surface thereof as the cylindrical drum 5 rotates. It adheres and rises, and contacts the vapor of the ferromagnetic substance 13 evaporated from the crucible 11 above the crucible 11 to condense it.

Further, on the outside of the end plate at the left end of the cylindrical body 2 in the figure, a vibrating means for vibrating the crucible 11 via the support members 9 and 9 fixed thereto, that is, a piezoelectric element 15 is mounted. .

Next, the operation of the above will be described.

First, a liquid (for example, alkylnaphthalene to which alkyl propylene diamine is added) 14 is accommodated in the bottom of a cylindrical drum 5, a ferromagnetic substance (for example, granular electrolytic cobalt) 13 is accommodated in a crucible 11, and a cylindrical body is also used. Two
Also, the inside of the cylindrical drum 5 is maintained at a high vacuum, the heater 12 is energized to heat the ferromagnetic substance 13 in the crucible 11, and the cylindrical drum 5 is rotated at an appropriate speed (for example, 2 revolutions per minute). The piezoelectric element 15 is rotated and an AC voltage is applied to the piezoelectric element 15.

When the ferromagnetic substance 13 in the crucible 11 is in a stable heated state, the ferromagnetic substance 13 in the crucible 11 evaporates and its vapor adheres to the inner peripheral surface of the cylindrical drum 5 as a film. When the liquid 14 is contacted and condensed, it moves downward with the rotation of the cylindrical drum 5 to reach the liquid 14 at the bottom, and when this operation is continued for a required time (for example, 30 minutes), the magnetization is large. A magnetic fluid will be obtained.

Moreover, during this period, the piezoelectric element 15 to which the AC voltage is applied vibrates due to the piezoelectric effect (piezo effect), and this vibration is generated from the left end plate of the cylindrical body 2 via the supporting members 9 and 9 and the crucible 11.
Ferromagnetic material 1 transmitted to the crucible 11 and stored in the crucible 11.
Then, the ferromagnetic substance 13 is agitated.

As a result, as shown in FIG. 2, the impurities 13b present on the surface of the melt 13a of the ferromagnetic substance 13 are prevented from forming a film.

Therefore, the evaporation of the melt 13a of the ferromagnetic material 13 is not hindered, and the vapor deposition rate does not gradually decrease with the elapse of vapor deposition time.

Further, since the melt 13a of the ferromagnetic substance 13 is scattered in a mist state by the vibration, the evaporation of the melt 13a of the ferromagnetic substance 13 is promoted, and as a result, the vapor deposition rate is rather higher than that of the conventional one. The vapor deposition time will be shortened.

The frequency (frequency) of the piezoelectric element 15 is preferably such that the ferromagnetic substance 13 resonates.

In addition, in the above-described embodiment, the piezoelectric element 1 is used as the vibrating means.
However, the present invention is not limited to this, for example, mechanical means for driving an eccentric cam, piston, etc. to generate vibration, or driving a coil placed in a magnetic field created by an electromagnet to generate vibration. It is possible to use electric / magnetic means such as a magnetic field generating device or a device that causes vibration by a magnetostrictive element.

Further, in the above embodiment, the vibrating means (piezoelectric element 13)
Is provided in contact with the outer surface of the end plate of the cylindrical body 2, but the vibrating means may be installed at any position as long as the vibration is directly or indirectly transmitted to the heating / evaporating device (crucible 11). .

Further, in the above embodiment, the structure in which the insides of the cylindrical body 2 and the cylindrical drum 5 are maintained in a high vacuum is shown, but the present invention is not limited to this, and for example, a low pressure inert gas or oxygen gas atmosphere may be used. May be

Further, the ferromagnetic substance 13 is not limited to granular electrolytic cobalt, but may be, for example, a ferromagnetic metal element such as iron, nickel, cadmium, or a ferromagnetic alloy containing at least one metal of chromium, manganese, or a rare earth element, or Ferromagnetic compounds may be used.

Further, the liquid 14 is not limited to the one obtained by adding alkyl propylene diamine to alkyl naphthalene, and, for example, low vapor pressure hydrocarbon, alkyl diphenyl ether, polyphenyl ether, diester, silicone oil, fluorocarbon oil, etc. may be used. As the surfactant, for example, soap which is a salt of carboxylic acid and metal or amine, polyhydric alcohol fatty acid ester such as sorbitan oleate pentaerythrite oleate, sulfonic acid such as alkylallyl sulfonate and octadecylbenzene sulfonate. Salts, other phosphates, phosphoric acid esters, amine derivatives and the like can be used.

Further, in the above embodiment, the crucible 11 made of alumina is used.
Although the structure is shown in which the heater 12 of the tungsten wire is used for heating, the invention is not limited to this, and the crucible 11
Of course may be made of beryllia, and the heating may of course be high frequency heating, infrared or laser heating, electron beam heating or arc plasma heating.

[Effect of device]

This invention is configured as described above, and by vibrating the heating / evaporating device by the vibrating means, an impurity film is formed on the surface of the melt of the ferromagnetic substance filled in the heating / evaporating device. The evaporation rate can be prevented from decreasing, and the evaporation of the ferromagnetic material is promoted by the vibration of the heating evaporation apparatus, so that the evaporation rate becomes higher than that of the conventional one, and therefore the evaporation rate is increased. It has an excellent effect that the time can be shortened.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a magnetic fluid manufacturing apparatus according to the present invention, FIG. 2 is an enlarged sectional view of a crucible, and FIG. 3 is a partially cutaway perspective view showing an example of a conventional device. It is a figure. 1, 21 ... Opening 2, 22 ... Cylindrical body 3, 23 ... Cylindrical member 4, 24 ... Flange 5, 25 ... Cylindrical drum 6, 26 ... Boss section 7, 27 ... O-ring 8 ... … Deep groove ball bearings 9, 29 …… Supporting members 10, 30 …… Electrodes 11, 31 …… Crucibles 12, 32 …… Heaters 13, 33 …… Ferromagnetic materials 13a, 33a …… Melts 13b, 33b …… Impurities 14, 34 ... Liquid 15 ... Piezoelectric element

Claims (1)

[Scope of utility model registration request] 1. A heating / evaporating device for a ferromagnetic substance made of a ferromagnetic metal element or a ferromagnetic compound is provided in a horizontal cylindrical container whose interior is a high vacuum or low pressure inert gas or oxygen gas atmosphere. While containing a liquid containing a surfactant as a solvent for the magnetic fluid and rotating the horizontal cylindrical container around its axis to form a film of the liquid on its inner peripheral surface, the heating evaporation An apparatus for producing a magnetic fluid, in which vapor of the ferromagnetic substance vaporized by the apparatus is brought into contact with the apparatus to condense, and a vibrating means for vibrating the heating and vaporizing apparatus is provided. apparatus.