Soft magnetic powder core
A powder magnetic core, soft magnetic technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of high resistivity and low strength, and achieve the effect of high resistivity
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Embodiment 1
[0055] Prepare pure iron ( AB company make, trade name: ABC100.30, average particle diameter about 100 micrometers). 0.30% by mass of vanadium isopropoxide and 0.96% by mass of triethyl borate were dissolved in isopropyl alcohol (IPA) to prepare a solution for treating an insulating film. The raw material powder and the solution for treating the insulating film are mixed and dried to produce a soft magnetic material.
[0056] After that, the soft magnetic material was used as a sample for resistivity measurement and a sample for 3-point bending strength test, and was thermoformed at 130° C. and 981 MPa to form a rod-shaped sample with a length of 30 mm, a width of 10 mm, and a thickness of 5.5 mm. Thereafter, heat treatment was performed at 500° C. for 1 hour in an air atmosphere to obtain a soft magnetic powder magnetic core.
Embodiment 2、 Embodiment 3、 comparative example 4
[0065]
[0066] As raw material powder, pure iron was prepared. Next, the raw material powder and the solution for insulating coating treatment containing the amounts of V and B corresponding to those shown in Table 1 were mixed and dried to produce respective soft magnetic materials.
[0067] Thereafter, the same steps as in Example 1 were performed on each soft magnetic material to obtain each soft magnetic powder magnetic core.
[0068] 〈Evaluation method〉
[0069] The three-point flexural strength was measured according to JISZ2511 with a universal strength testing machine (Automatic plotter manufactured by Shimadzu Corporation, AG-5000I / R). Resistivity is measured by grinding the both sides of the resistivity measurement sample (10×5.5 square) and applying In-Ga paste to form terminal electrodes, and measuring the terminals with a low resistance meter (manufactured by Tsuruga Electric Co., Ltd., MODEL3569) resistance value between.
[0070] The structures and composi...
Embodiment 4～ Embodiment 13
[0081] As raw material powder, pure iron was prepared. Next, a solution for treating an insulating film was prepared by dissolving 0.2% by mass of phosphoric acid and 0.004% by mass of the materials listed in Table 3 in IPA with respect to the raw material powder. Next, the raw material powder and the solution for treating the insulating coating were mixed and dried to produce respective soft magnetic materials.
[0082] Next, the same solution for treating an insulating film as in Example 1 was prepared. Then, each soft magnetic material and the solution for treating an insulating coating were mixed and dried to produce each soft magnetic material.
[0083] Thereafter, the same process as in Example 1 was performed on each soft magnetic material, thereby producing each soft magnetic powder magnetic core.
[0084] Table 3 shows the materials of Examples 4 to 13, and Table 4 shows the measurement results.
[0085] [table 3]
[0086]
[0087] [Table 4]
[0088] ...
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