Iron-based Soft Magnetic Powder And Production Method Thereof
A technology of iron-based powder and manufacturing method, which is used in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problem of lowering the strength of the powder magnetic core, and achieve smaller retention force, lower costs, and higher strength. Effect
Inactive Publication Date: 2013-07-17
KOBE STEEL LTD
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Problems solved by technology
However, the shape of the particles is close to spherical, and the physical entanglement between the particles during compression molding is reduced, which causes another problem that the strength of the dust core is lowered.
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[0035]The inventors of the present invention aimed to provide a method capable of reducing the coercive force of the powder magnetic core by reducing the coercive force of the soft magnetic iron oxide-based powder obtained by water atomization treatment by reducing the heat treatment of the soft magnetic iron-based powder. The soft magnetic iron-based powder used in the dust core has been repeatedly researched. As a result, it was found that a plurality of partially sintered particles exist in the state of secondary particles that apparently act as one particle in the soft magnetic iron-based powder obtained by water atomization treatment and subjected to reduction heat treatment. , the result of this state is to have an adverse effect on the coercive force of the powder magnetic core. In order to reduce the coercive force of the powder magnetic core, after the average particle size of the soft magnetic iron-based powder reaches 100 μm or more, the soft magnetic iron-based powd...
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Abstract
Disclosed is an iron-based soft magnetic powder obtained by preparing an iron-oxide-based soft magnetic powder through water atomization, and thermally reducing the iron-oxide-based soft magnetic powder. The iron-based soft magnetic powder has an average particle size of 100 mum or more and has an interface density of more than 0 mum-1 and less than or equal to 2.610-2 mum-1, where the interface density is determined from a cross-sectional area (mum2) and a cross-sectional circumference (mum) of the iron-based soft magnetic powder. The iron-based soft magnetic powder obtained by preparing an iron-oxide-based soft magnetic powder through water atomization and thermally reducing the iron-oxide-based soft magnetic powder, when used for the production of a dust core, can give a dust core having a low coercive force. Also disclosed is a duct core having a low coercive force and exhibiting superior magnetic properties.
Description
technical field [0001] The present invention relates to powder magnetic cores used for electromagnetic components such as motors, actuators, reactors, etc., soft magnetic iron-based powders used in the production of the powder magnetic cores, and a production method thereof. Background technique [0002] Electromagnetic components such as motors are often used in an AC magnetic field, and a magnetic core (core material) is used for the electromagnetic components. The magnetic core has conventionally been manufactured by processing laminated electrical steel sheets. However, magnetic cores obtained by processing electromagnetic steel sheets have directional magnetic properties, so it is difficult to design electromagnetic elements with three-dimensional magnetic circuits. Therefore, in recent years, techniques for manufacturing dust cores by compression molding soft magnetic iron-based powders have been studied. Since the magnetic properties of the dust core become isotropi...
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IPC IPC(8): H01F1/147H01F1/20B22F9/08B22F9/20
CPCH01F1/344H01F1/01H01F41/02H01F41/0246H01F3/08Y10T428/12181B22F1/00B22F9/08H01F1/20H01F1/26
Inventor 宫村刚夫三谷宏幸北条启文
Owner KOBE STEEL LTD