Core for inductance elements and its production method

Details Core for inductance elements and its production method Core for inductance elements and its production method

1997-06-20

1999-10-12

Gellner, Michael L.

Inductor devices

Core

252 6256, C01G 4908, H01F 2728

Patent

active

059660651

ABSTRACT:
A core for inductance elements is formed of a sintered body of .alpha.-ferric oxide. The core has a flexural strength of at least 6 kgf/mm.sup.2 as measured by a three-point bending method, a specific resistance of at least 10.sup.6 .OMEGA..multidot.cm, a Vickers hardness of 800 to 1,500, and an iron content of 75 to 99.9 wt %, calculated as Fe.sub.2 O.sub.3. The core is produced by granulating, and forming a ferric iron powder, and holding a formed body for sintering at 950 to 1,500.degree. C. for 5 min. to 5 hours in an atmospheric environment.

REFERENCES:
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patent: 5062197 (1991-11-01), Charles
patent: 5262363 (1993-11-01), Yoshida et al.
patent: 5688430 (1997-11-01), Matsuzaki et al.
Yamamoto et al, Some properties of anisotropic alsium-lanthanum-sodium system ferrite magnets,Meiji Daigaku Kagaku Gijutsu Kenkyusho Kiyo 1982, vol. Date 1981.

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