Magnetic material, powder magnetic core, inductor, and method of manufacturing powder magnetic core
View Patent ↗A magnetic material includes an Fe—Si—Al-based metal magnetic powder. The Fe—Si—Al-based metal magnetic powder has the following relationships when the Si content is A % by weight and the Al content is B % by weight: 7.2% by weight≤A≤8.1% by weight, 6.0% by weight≤B≤7.5% by weight, and 2A+B≤22.7% by weight.
1 . A magnetic material comprising:
an Fe—Si—Al-based metal magnetic powder,
wherein the Fe—Si—Al-based metal magnetic powder has the following relationships when a Si content is A % by weight and an Al content is B % by weight:
7.2% by weight≤A≤8.1% by weight, 6.0% by weight≤B≤7.5% by weight, and 2A+B≤22.7% by weight.
2 . The magnetic material according to claim 1 ,
wherein an oxygen content of the Fe—Si—Al-based metal magnetic powder is less than or equal to 500 ppm.
3 . The magnetic material according to claim 1 ,
wherein a particle size distribution of the Fe—Si—Al-based metal magnetic powder is (D90−D10)/D50≥1.0.
4 . A powder magnetic core comprising:
the magnetic material according to claim 1 .
5 . The powder magnetic core according to claim 4 ,
wherein a filling rate of the Fe—Si—Al-based metal magnetic powder in the powder magnetic core is at least 81% and at most 85%.
6 . An inductor comprising:
a magnetic core including the powder magnetic core according to claim 4 ; and
a coil portion at least partially provided inside the magnetic core.
7 . A method of manufacturing a powder magnetic core, the method comprising:
molding the powder magnetic core by pressure-molding a magnetic material including an Fe—Si—Al-based metal magnetic powder; and
heating the powder magnetic core molded, at least 650° C. and at most 800° C.,
wherein the Fe—Si—Al-based metal magnetic powder has the following relationships when a Si content is A % by weight and an Al content is B % by weight:
7.2% by weight≤A≤8.1% by weight, 6.0% by weight≤B≤7.5% by weight, and 2A+B≤22.7% by weight.