Magnetic composite, method for producing the same, and shielding structure
View Patent ↗The present invention provides a magnetic composite capable of enhancing the effect of shielding against electromagnetic noise and the like (magnetic shielding effect) while inhibiting a possible eddy current, and a method for producing the magnetic composite, and a shielding structure comprising the magnetic composite. A shielding member 10 as a magnetic composite contains a resin 12 which is an insulator and serves as a matrix material and into which fine powders of an amorphous metal magnetic substance 10 a containing Fe, Si, and B are mixed. In the shielding member 10 , a plurality of the amorphous metal magnetic substances 10 a are contained in the resin 12 at a volume fraction less than a percolation threshold. The type of the amorphous metal magnetic substance 10 a is not particularly limited provided that the amorphous metal contains Fe, Si, and B.
1. A magnetic composite produced by:
melting metal containing Fe, Si, and B;
ejecting the melted metal through a nozzle in a pulse form;
ejecting a refrigerant toward the ejected metal through the nozzle in a pulse from;
cooling the ejected metal to form an amorphous metal magnetic substance; and
mixing a plurality of the amorphous metal magnetic substances into an insulator at a volume fraction equal to or less than the percolation threshold.
2. A method for producing a magnetic composite, the method comprising:
melting metal containing Fe, Si, and B;
ejecting the melted metal through a nozzle in a pulse form;
ejecting a refrigerant toward the ejected metal through the nozzle in a pulse from;
cooling the ejected metal to form an amorphous metal magnetic substance; and
mixing a plurality of the amorphous metal magnetic substances into an insulator at a volume fraction equal to or less than the percolation threshold.
3. The magnetic composite according to claim 2 , wherein the insulator is translucent.
4. The method for producing the magnetic composite according to claim 2 , wherein the amorphous metal magnetic substance is formed to have an aspect ratio of 2 to 5.
5. The magnetic composite of claim 1 , wherein the magnetic composite is formed into a fiber, yarn, or fabric.
6. The method for producing the magnetic composite according to claim 2 , wherein the insulator includes an uncured resin or polymerizable monomer.
7. The method for producing the magnetic composite according to claim 2 , wherein the insulator includes a rubber or inorganic material.
8. The method for producing the magnetic composite according to claim 2 , wherein the insulator is a liquid, and further comprising:
coating the insulator onto an electronic device in liquid form; and
allowing the insulator to dry or solidify.
9. The method for producing the magnetic composite according to claim 2 , further comprising:
forming the magnetic composite into a fiber, yarn, or fabric.
10. The method for producing the magnetic composite according to claim 2 , wherein the refrigerant and the melted metal are ejected at the same time.
11. The method for producing the magnetic composite according to claim 2 , wherein cooling the ejected metal to form the amorphous metal magnetic substance comprises:
allowing the refrigerant, the melted metal, or both to flow and diffuse spirally.