Silicon oxide-coated Fe-based soft magnetic powder and method for producing same
A technology of silicon oxide and manufacturing method, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., and can solve problems such as low resistivity
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Embodiment 1
[0094] In a 300 mL reaction vessel, 120 g of isobutanol (IBA: Hansen SP value at 25° C. is 11.3) and 21 g of pure water were charged at room temperature and mixed at 850 rpm using a stirring blade to prepare a mixed solvent. Pure Fe powder (O 2 : 0.096 mass%, Si: 0.00 mass%, BET specific surface area: 0.096m 2 / g, D 50 : 101.7μm, volume resistivity: 1.1×10 -2 Ω·cm) 75g, obtained the slurry that is dispersed with pure Fe powder. Then, a nitrogen gas was flowed through the upper space of the reaction container to perform a nitrogen purge, and it was confirmed that the oxygen concentration in this space was zero using an oxygen concentration meter. While stirring this slurry at a stirring rate of 850 rpm, the temperature was raised from room temperature to 40° C. over 15 minutes. Meanwhile, the retention time of the slurry in the dispersion step was 15 minutes.
[0095] 2.80 g of tetraethoxysilane (TEOS: Wako Pure Chemical Industries, Ltd. Special Grade Reagent) taken out in...
Embodiment 2 and 3
[0103] As Example 2, silicon oxide-coated pure Fe powder was obtained by the same procedure as in Example 1 except that the TEOS added to the above slurry was changed to 3.60 g of TPOS. In Example 3, silicon oxide-coated pure Fe powder was obtained by the same procedure as in Example 1 except that the TEOS added to the above slurry was changed to 3.60 g of TPOS and the aging time was changed to 150 minutes. The production conditions of the silicon oxide-coated pure Fe powders of Examples 2 and 3 are shown in Table 1, and the physical properties of the obtained silicon oxide-coated pure Fe powders measured in the same manner as in Example 1 are also shown in Table 2. .
Embodiment 4
[0113] 120 g of isobutanol (IBA: Hansen SP value at 25° C. is 11.3) and 21 g of pure water were put into a 300 mL reaction vessel at room temperature, and mixed at 850 rpm using a stirring blade to prepare a mixed solvent. In the solvent, as Fe-based soft magnetic powder, pure Fe powder (O 2 : (0.9) mass%, Si: 0.00 mass%, BET specific surface area: 0.669m 2 / g, D 50 : 6.28 μm, volume resistivity: 5.2Ω·cm) 75 g, and a slurry in which pure Fe powder was dispersed was obtained. Then, a nitrogen gas was flowed through the upper space of the reaction container to perform a nitrogen purge, and it was confirmed that the oxygen concentration in this space was zero using an oxygen concentration meter. While stirring this slurry at a stirring rate of 850 rpm, the temperature was raised from room temperature to 40° C. over 15 minutes. Meanwhile, the retention time of the slurry in the dispersion step was 15 minutes.
[0114] 3.40 g of tetraethoxysilane (TEOS: Wako Pure Chemical Indus...
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Abstract
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