Iron-based soft magnetic powder for powder magnetic core, method for producing the iron-based soft magnetic powder for powder magnetic core, and powder magnetic core

A powder magnetic core and soft magnetic technology, which is applied to the iron-based soft magnetic powder for powder magnetic core and the manufacture of iron-based soft magnetic powder for the powder magnetic core and the field of powder magnetic core, can solve the problem of high cost and achieve improved durability Thermal properties, high heat resistance, and high magnetic flux density effects

Active Publication Date: 2016-06-08
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, among the elements contained in the phosphoric acid-based chemical conversion coating, rare metals such as Co and W are difficult to obtain, and there is a problem of high cost.

Method used

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  • Iron-based soft magnetic powder for powder magnetic core, method for producing the iron-based soft magnetic powder for powder magnetic core, and powder magnetic core

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Embodiment Construction

[0023] The present inventors formed a powder compact of an iron-based soft magnetic powder base material on which a coating film composed of only phosphoric acid or a glassy insulating layer obtained from phosphoric acid described in Patent Document 1 was formed, and obtained a pressed powder. Powder shaped body (powder core). Furthermore, the present inventors measured the electrical resistivity (μΩ·m) of the powder compact by changing the temperature. As a result, in all cases, it was confirmed that the resistivity of the compact was lowered to about 10 μΩ·m by the treatment at 450° C. (under a nitrogen atmosphere, for 1 hour).

[0024] The inventors of the present invention studied the cause of the decrease in resistivity, and as a result, it is speculated that oxygen atoms derived from phosphoric acid contained in the phosphoric acid-based film diffused during heat treatment at a high temperature and bonded to Fe to form oxidation of Fe that functions as a semiconductor. ...

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Abstract

The present invention provides an iron-based soft magnetic powder for powder magnetic cores, which does not use rare metals, can maintain electrical insulation between iron powder particles even when heat treatment is performed at a high temperature, and has excellent thermal stability and mechanical strength. In addition, the present invention provides a method for producing the above-mentioned iron-based soft magnetic powder for powder magnetic cores and a powder magnetic core. In the iron-based soft magnetic powder for dust cores of the present invention, a phosphoric acid-based chemical conversion coating is formed on the surface of the iron-based soft magnetic powder, and a silicone resin coating is formed on the surface of the phosphoric acid-based chemical conversion coating. The phosphoric acid-based chemical conversion coating contains P, B, Mg, and Al.

Description

technical field [0001] The present invention relates to an iron-based soft magnetic powder for a powder magnetic core, a method for manufacturing the iron-based soft magnetic powder for a powder magnetic core, and a powder magnetic core manufactured using the iron-based soft magnetic powder for a dust magnetic core. Background technique [0002] The magnetic cores of electromagnetic equipment such as motors and transformers used in AC have traditionally used magnetic cores made of laminated electromagnetic steel sheets or electric iron sheets. However, in recent years, pure iron powder or soft magnetic iron-based alloy powder whose surface has been subjected to insulation treatment has begun to be used due to its higher degree of freedom in three-dimensional shape and higher magnetic properties than magnetic cores made of laminated electrical steel sheets or electrical iron sheets. Isopress powder core is a powder core formed by compression molding of iron-based soft magneti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/26H01F1/24H01F41/02B22F1/08B22F1/102B22F1/16
CPCH01F1/24H01F1/26H01F41/0246H01F1/33C22C2202/02H01F3/08B22F1/102B22F1/16B22F1/08H01F41/02H01F41/005
Inventor 三谷宏幸大胁武史北条启文西田智谷口祐司
Owner KOBE STEEL LTD
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