Magnetic core contg. magnetic bias magnet and induction element with said magnetic core
A magnetic bias and magnet technology, applied in the direction of inductors with magnetic cores, electrical components, magnetic cores/yokes, etc., to achieve excellent DC superposition characteristics and prevent the performance of inductive components from degrading
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example 1
[0068] Prepare six glass powders. These powders are ZnO-B with a softening point of about 350°C 2 o 3 -PbO(1), ZnO-B with a softening point of about 400°C 2 o 3 - PbO(2), B with a softening point of about 450°C 2 o 3 -PbO, K with a softening point of about 500°C 2 O-SiO 2 -PbO, SiO with a softening point of about 550°C 2 -B 2 o 3 -PbO(1), SiO with a softening point of about 600°C 2 -B 2 o 3 -PbO(2). Each powder has a particle diameter of about 3 μm.
[0069] By pulverization, Sm 2 co 17 Magnet powder is made of sintered material into magnet powder. That is, Sm made by common powder metallurgy process 2 co 17 sintered material. For the magnetic properties of the prepared sintered material, its (BH) 最大 It is 28MGOe, and its coercive force is 25KOe (kilo Oersted). The above-mentioned sintered material is roughly ground with a jaw mill, a disc mill, or the like, and then ground with a ball mill to have an average particle diameter of about 5.0 μm.
[0070] Ea...
example 2
[0079] The magnet powder and glass powder were mixed so that each mixture obtained had a glass powder content of 0.1%, 0.5%, 1.0%, 2.5%, 5.0%, 7.5%, 10% or 12.5% by weight. The above-mentioned magnet powder is the Sm used in example 1 2 co 17 Magnet powder, while the glass powder is SiO of about 3 μm and has a softening point of about 500°C 2 -B 2 o 3 - PbO glass powder. Each of the prepared mixtures was heat-treated at 550°C in an argon atmosphere, so that the magnet powder was covered with glass. The above-mentioned glass-covered magnet powder was mixed with 50% by volume of polyimide resin as a binder, and the prepared mixture was made into a sheet by a doctor blade method. The obtained sheet was dried to remove the solvent, and then, was molded to a thickness of 0.5 mm by a heat press.
[0080] The magnetic properties of the bonded magnet were measured in a similar manner as in Example 1 using separately prepared samples. Therefore, regardless of the amount of gla...
example 3
[0101] Prepare six glass powders. These powders are ZnO-B with a softening point of about 350°C 2 o 3 -PbO(1), ZnO-B with a softening point of about 400°C 2 o 3 - PbO(2), B with a softening point of about 450°C 2 o 3 -PbO, K with a softening point of about 500°C 2 O-SiO 2 -PbO, SiO with a softening point of about 550°C 2 -B 2 o 3 -PbO(1), SiO with a softening point of about 600°C 2 -B 2 o 3 -PbO(2). Each powder has a particle diameter of about 3 μm.
[0102] for Sm 2 co 17 For the preparation of magnet powder, the ingot is ground and sintered through ordinary powder metallurgy process to make sintered material. The resulting sintered material was finely ground to 2.3 μm. The magnetic properties of the prepared magnet powder were measured using a VSM (Vibrating Sample Magnetometer), and as a result, the coercive force iHc was about 9 kOe.
[0103] Each prepared magnet powder was mixed with 1% glass powder respectively. Each of the prepared mixtures was heat-t...
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