Magnetic powder, and manufacturing method thereof
A magnetic powder contains magnetic particles, a first coating layer disposed on surfaces of the magnetic particles and containing a first glass, and a second coating layer disposed on the first coating layer and containing a second glass different from the first glass. A method of manufacturing magnetic powder includes preparing magnetic particles, forming a first coating layer containing a first glass on surfaces of the magnetic particles, and forming a second coating layer containing a second glass different from the first glass on the first coating layer.
1. A magnetic powder comprising:
a magnetic particle;
a first coating layer disposed on a surface of the magnetic particle, and containing a first glass; and
a second coating layer disposed on the first coating layer, and containing a second glass having a softening point of 20° C. or more lower than that of the first glass,
wherein
the first and second glass include one or more selected from P 2 O 5 —ZnO based glass and Bi 2 O 3 —B 2 O 3 based glass.
2. The magnetic powder of claim 1 , wherein the magnetic particle includes an iron (Fe) based alloy.
3. The magnetic powder of claim 1 , wherein the magnetic particle has a particle size of 5 μm to 100 μm.
4. The magnetic powder of claim 1 , wherein the first and second coating layers have different specific resistance values from each other.
5. The magnetic powder of claim 1 , wherein the first and second coating layers are made of the first and second glasses, respectively.
6. The magnetic powder of claim 1 , wherein a glass transition temperature Tg of the first glass and the second glass is from 300° C. to 550° C.
7. A magnetic material comprising:
a magnetic particle;
a first coating layer completely surrounding the magnetic particle and containing a first glass; and
a second coating layer completely surrounding the first coating layer and containing a second glass having a softening point of 20° C. or more lower than that of the first glass,
wherein
the first and second glass include one or more selected from P 2 O 5 —ZnO based glass and Bi 2 O 3 —B 2 O 3 based glass.
8. The magnetic material of claim 7 , wherein the magnetic particle includes an iron (Fe) based alloy.
9. The magnetic material of claim 7 , wherein the magnetic particle has a particle size of 5 μm to 100 μm.
10. The magnetic material of claim 7 , wherein the first and second coating layers have different specific resistance values from each other.
11. The magnetic material of claim 7 , wherein a glass transition temperature Tg of the first glass and the second glass is from 300° C. to 550° C.
12. An electronic component, comprising:
a body comprising the magnetic material of claim 7 ;
a coil part disposed in the body; and
an external electrode connected to the coil part.
13. An electronic component, comprising:
a body comprising the magnetic powder of claim 1 ;
a coil part disposed in the body; and
an external electrode connected to the coil part.