Iron-based soft magnetic powder for dust core, method for manufacturing the same, and dust core
AssigneeKobe Steel, Ltd.
InventorsTakeshi Ohwaki, Hiroyuki Mitani, Hirofumi Hojo, Kasumi Yanagisawa, Nobuaki Akagi
Life of this patent
Estimating the term…
Abstract
An iron-based soft magnetic powder for dust core having a high magnetic flux density, maintaining high electric insulation even after annealing, and more excellent in the mechanical strength in which a coating film having a phosphate conversion coating film is formed on the surface thereof and the peak height for the absorption of hydroxyl groups formed at 3700 cm−1 to 2500 cm−1 is 0.04 or more being indicated by absorbance when the coating film is analyzed by infrared diffuse reflectance spectroscopy.
Claims15
A method of manufacturing a coated iron-based soft magnetic powder, comprising applying water to a surface of a non-hydrated phosphate conversion coating film coated on an iron-based soft magnetic powder, to obtain a coated iron-based soft magnetic powder wherein a peak height for the absorption of hydroxyl groups formed at 3700 cm−1 to 2500 cm−1 is 0.04 or more as indicated by absorbance when the coating film is analyzed by infrared diffuse reflectance spectroscopy.
Dependencies are inferred from the claim text.