JPH0222895A - Manufacture of platy body for magnetic shielding - Google Patents

Abstract

PURPOSE:To easily form a platy body having an excellent magnetic shielding effect by pouring a wall material into a form of a platy body after mixing powder and grains of high- or ordinary temperature superconductive material with the wall material and by applying a magnetic field to one side of the form so that the superconductive material can be concentrated on the opposite side. CONSTITUTION:A fluidal wall material 1 of concrete is poured into a form 3 of a platy body after power and grains of ordinary temperature superconductive material 2 is mixed with and scattered into the material 1. While the wall material maintains fluidity, a magnetic field is impressed upon the wall material 1 by bringing a magnet 4 into contact with the form 3. Then the superconductive material 2 moves to the side opposite to the side to which the magnetic field is applied due to its perfect diamagnetism and, as a result, the material 2 stays on the side and a concentrated layer of the material 2 is formed on the side of the form 3. Thereafter, the magnet 4 is removed and the form 3 is disintegrated after the wall material 1 hardens, and thus, a platy body is formed. The platy body is used for constituting a magnetic shielding chamber. The platy body thus formed has a part where the high- or ordinary- temperature superconductive material is concentrated and a uniform magnetism shielding property. Therefore, efficient magnetic shielding can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a plate-like body for magnetic shielding.
More specifically, the present invention relates to a method for producing a magnetic shielding plate-shaped body in which a wall material is mixed with a high-temperature or room-temperature superconductor of ceramics such as yttrium, barium, and copper having a perovskite crystal structure.

(Prior Art) With the spread of various electronic devices such as computers and robots in recent years, there has been an increasing demand for magnetically shielded rooms that shield magnetic fields that are a disturbance factor for electronic devices. Currently, a magnetically shielded room is constructed by attaching a shield plate made of a ferromagnetic material such as iron or a strong and highly conductive material such as copper to the side of the room, but this has performance limitations and In order to prevent the intrusion of magnetism, gaps must be eliminated, which requires special processing and is expensive. Therefore, in the invention related to Japanese Patent Application No. 62-308700, the present applicant previously proposed a magnetic shielding system that utilizes the complete diamagnetism of the room temperature superconducting material by mixing or embedding room temperature superconducting material in the wall material that partitions the periphery of the room. We are proposing the configuration of the room.

(Problem to be solved by the invention) However, in the above-mentioned wall materials, the room-temperature superconducting material is dispersed throughout the wall material, so the magnetic shielding effect is poor even though expensive superconducting materials are used. There was a problem that it was low.

The present invention has been made in view of the above-mentioned problems, and its object is to provide a method for easily manufacturing a plate-like body having an extremely excellent magnetic shielding effect.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a powdery high temperature or room temperature superconductor is mixed into a wall material, the wall material is poured into a formwork of a plate-like body, and the formwork is By applying a magnetic field to one side of the superconductor, the superconductor is concentrated and unevenly distributed on the side opposite to the side to which the magnetic field is applied.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 in the figure is a wall material made of concrete. This wall material 1 is in a fluid state, and a powdery room temperature superconductor 2 is added thereto.
, mix well to disperse, and pour into the formwork 3 of the plate-shaped body. (Fig. 1) The room-temperature superconductor 2 used here is in the form of particles with a particle size of 0°1 to 10 or a powder of 10 to 100 μs (microns), and is sintered at an appropriate temperature in the range of 900 to 1000°C. This is a result of the above. Note that the amount of room-temperature superconductor 2 mixed and the particle size are adjusted as appropriate depending on the thickness, area, etc. of the wall to be molded.

Furthermore, it is preferable to apply a waterproof coating to yttrium-based materials.

After pouring the wall material mixed with the room-temperature superconductor 2 into the formwork 3, the magnet 4 is placed in the formwork 3 while the wall material has fluidity.
A magnetic field is applied to the wall material 1 by applying it to one side of the wall material 1. Then, as shown in FIG. 2, the room-temperature superconductor 2 moves to the side opposite to the surface to which the magnetic field is applied due to its perfect diamagnetic property, and as shown in FIG. The bodies 2 become unevenly distributed, and a dense layer of room-temperature superconductors 2 is formed there. Afterwards, the magnet 4 is removed, the wall material 1 is hardened, the formwork 3 is removed, and a magnetically shielded room or the like is constituted by the molded plate-like body.

(Effects) As described above, according to the present invention, a powdery high-temperature or room-temperature superconductor is mixed into a wall material, poured into a formwork of a plate-like body, and a magnetic field is applied to one side of the formwork. Because the room-temperature superconductor is unevenly distributed at high density on the side opposite to the side to which the magnetic field is applied, a plate-shaped body formed by this method has a high-density layer of high-temperature or room-temperature superconductor. , the unevenness of the magnetic shielding effect is eliminated, and an efficient magnetic shielding force can be obtained.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of the wall material and the room-temperature superconductor mixed into the formwork poured into it, Figure 2 is a partial cross-sectional view of the formwork with a magnetic field applied to it, and Figure 3 is a partial cross-sectional view of the mold with a magnetic field applied to it. FIG. 2 is a partial sectional view of the state after the magnetic field and formwork have been removed from the state of FIG. 2; 1... Wall material 2... Room temperature superconductor 3... Formwork Figure 1 Figure 2

Claims (1)

[Claims] A powdery high-temperature or room-temperature superconductor is mixed into the wall material, and the wall material is poured into a plate-shaped formwork, and a magnetic field is applied to one side of the formwork, so that the superconductor is separated from the side to which the magnetic field is applied. A method for manufacturing a plate-like magnetic shielding body, characterized in that the magnetic shielding plate is unevenly distributed at high density on the opposite side.