JPH0682948B2 - Method for manufacturing plate-like body for magnetic shielding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a method for manufacturing a magnetic shielding plate,
More specifically, the present invention relates to a method for producing a magnetic shielding plate-like body obtained by mixing concrete with a superconductor made of, for example, yttrium-barium-copper ceramic having a perovskite crystal structure.

<< Prior Art >> With the widespread use of various electronic devices such as computers and robots in recent years, there is an increasing demand for a magnetically shielded room that shields the magnetism that is a disturbance factor of the electronic devices. At present, the magnetically shielded room is constructed by attaching a shield plate made of a ferromagnetic material such as iron or a strong conductive material such as copper on the inner side surface of the room, and this has a limit in performance and the magnetic field. In order to prevent the invasion of the holes, it is necessary to eliminate the gap, special processing is required, and the cost is high. Therefore, in the invention of Japanese Patent Application No. 62-308700, the applicant has previously constructed a magnetically shielded room using the complete diamagnetism of the superconducting substance by mixing or burying the superconducting substance in the concrete that partitions the room. Is proposed.

<< Problems to be Solved by the Invention >> However, in the concrete as described above, since the superconducting substance is in a state of being dispersed throughout the concrete, it is said that the magnetic shielding effect is low in spite of using an expensive superconducting substance. There was a problem.

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

<< Means for Solving the Problem >> In order to achieve the above object, in the present invention, a superconductor of a powder or granular material is mixed into concrete, and the concrete is poured into a form of a plate-like body and a magnetic field is applied to one side of the form. Is applied to disperse the superconductor at a high density on the side opposite to the side to which the magnetic field is applied.

<< Embodiment >> A preferred embodiment 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. The wall material 1 is made into a fluid state, and the powdery and granular superconductor 2 is put therein, well mixed and dispersed, and poured into the plate-shaped mold 3. (FIG. 1) The superconductor 2 used here has a particle size of 0.1 to 10 mm or a particle size of 10 to 100 μm (micron),
Sintered at an appropriate temperature in the range of 1000 ° C. The mixing amount and particle size of the superconductor 2 are the thickness of the wall to be molded,
It may be adjusted depending on the area.

Further, it is preferable that the yttrium-based material be waterproof coated.

Then, after the concrete containing the superconductor 2 is poured into the mold 3, a magnet 4 is applied to one surface of the mold 3 while the concrete has fluidity, and a magnetic field is applied to the wall material 1.
Then, as shown in FIG. 2, the superconductor 2 moves to the side opposite to the surface to which the magnetic field is applied due to its complete diamagnetism,
As shown in FIG. 3, the superconductor 2 is unevenly distributed on one side of the wall material 1, and the dense layer of the superconductor 2 is formed here. After that, the magnet 4 is removed, the wall material 1 is hardened, and then the mold 3 is removed to form a magnetically shielded room or the like by the molded plate-like body.

<< Effects >> As described above, according to the present invention, a powdery and granular superconductor is mixed into concrete, and the superconductor is poured into a mold of a plate-like body and a magnetic field is applied to one surface of the mold to make Since it is unevenly distributed in a high density on the side opposite to the surface on which the voltage is applied, a layer with a high density of superconductors is formed in the plate-shaped body formed by this method, and the unevenness of the magnetic shielding effect is eliminated, and the efficiency is improved. Good magnetic shielding power can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of concrete and a superconductor mixed therein in a form, FIG. 2 is a partial cross-sectional view of a form in which a magnetic field is applied, and FIG. 3 is FIG. FIG. 6 is a partial cross-sectional view of a state after removing the magnetic field and the mold from the state of FIG. 1 ... Wall material, 2 ... Room temperature superconductor 3 ... Formwork

Claims (1)

[Claims] Claim: What is claimed is: 1. A powdery and granular superconductor is mixed into concrete, the concrete is poured into a plate-shaped mold, and a magnetic field is applied to one surface of the mold to define the side on which the magnetic field is applied. A method of manufacturing a magnetic shielding plate-shaped body, characterized in that it is formed on the opposite side with a high density.