Dust core, ferromagnetic powder composition therefor, and method of making
First Claim
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1. A ferromagnetic powder composition for dust cores comprising, a ferromagnetic metal powder and 0.1 to 15% by volume based on said ferromagnetic metal powder of a titania sol and/or a zirconia sol;
- wherein said ferromagnetic metal powder is of iron.
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Abstract
A ferromagnetic powder composition for dust cores contains a ferromagnetic metal powder and 0.1-15% by volume based on the powder of titania sol and/or zirconia sol. The composition is pressure molded and desirably annealed into a dust core which exhibits a high magnetic flux density, low coercivity, low loss and high mechanical strength.
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13 Claims
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1. A ferromagnetic powder composition for dust cores comprising, a ferromagnetic metal powder and 0.1 to 15% by volume based on said ferromagnetic metal powder of a titania sol and/or a zirconia sol;
wherein said ferromagnetic metal powder is of iron. - View Dependent Claims (3, 10, 11, 13)
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2. A ferromagnetic powder composition for dust cores comprising, a ferromagnetic metal powder and 0.1 to 15% by volume based on said ferromagnetic metal powder of a titania sol and/or a zirconia sol;
- and further comprising 0.1 to 30% by volume, based on said ferromagnetic metal powder, of a heat resistant resin.
- View Dependent Claims (4, 5, 6, 7, 8, 9, 12)
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