	US 11,814,318 B2
	Ferrite sintered body and coil component
Yuichiro Tsukada, Nagaokakyo (JP); Yuko Fujita, Nagaokakyo (JP); Takanori Suzuki, Nagaokakyo (JP); and Atsushi Shimamura, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Sep. 8, 2021, as Appl. No. 17/469,789.
Claims priority of application No. 2020-163626 (JP), filed on Sep. 29, 2020.
Prior Publication US 2022/0098114 A1, Mar. 31, 2022
Int. Cl. C04B 35/26 (2006.01); H01F 1/34 (2006.01); H01F 3/10 (2006.01); H01F 5/00 (2006.01); H01F 27/255 (2006.01)

CPC C04B 35/2625 (2013.01) [C04B 35/265 (2013.01); H01F 1/344 (2013.01); H01F 3/10 (2013.01); H01F 5/00 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3241 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3265 (2013.01); C04B 2235/3279 (2013.01); C04B 2235/3281 (2013.01); C04B 2235/3284 (2013.01); C04B 2235/34 (2013.01); H01F 27/255 (2013.01)]

8 Claims

1. A ferrite sintered body containing:

Fe;

Mn;

Zn;

Cu; and

Ni,

wherein when Fe, Mn, Zn, Cu, and Ni are converted into Fe₂O₃, Mn₂O₃, ZnO, CuO, and NiO, respectively, and a sum of contents of Fe₂O₃, Mn₂O₃, ZnO, CuO, and NiO is 100 mol %, a sum of the contents of Fe₂O₃and Mn₂O₃is 48.47 mol % to 49.93 mol %, the content of Mn₂O₃is 0.07 mol % to 0.37 mol %, the content of ZnO is 28.95 mol % to 33.50 mol %, and the content of CuO is 2.98 mol % to 6.05 mol %,

102 ppm to 4,010 ppm Zr in terms of ZrO₂and 10 ppm to 220 ppm Al in terms of Al₂O₃are further contained per 100 parts by weight of a sum of amounts of contained Fe₂O₃, Mn₂O₃, ZnO, CuO, and NiO, and

in a cross section of the ferrite sintered body, an area fraction of pores and an area fraction of segregations containing Cu are 2.0% or less.