Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Iron-based soft magnetic powder for dust core, production method thereof, and dust core

A powder magnetic core and soft magnetic technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic cores/yokes, transformers/inductor cores, etc., can solve the problem of increased eddy current loss and electrical insulation of powder magnetic cores Insufficient problems, such as low iron loss, improved heat resistance, and high magnetic flux density

Inactive Publication Date: 2009-09-30
KOBE STEEL LTD
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Patent Document 2, although the hysteresis loss can be reduced by high temperature annealing, the disadvantage of high temperature annealing is that the eddy current loss increases, and the electrical insulation of the annealed dust core becomes insufficient.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Pure iron powder (manufactured by Kobe Steel, Atmel 300NH, average particle diameter 80 to 100 μm) was used as the soft magnetic powder. Water: 1000 parts, Na 2 HPO 4 : 88.5 parts, H 3 PO 4 : 181 copies, H 2 SO 4 : 61 copies, Co 3 (PO 4 ) 2 : 30 parts, Cs 2 SO 4 : 44 parts were mixed, and 10 parts of the 10-fold diluted treatment solution was added to 200 parts of the above-mentioned pure iron powder passing through a sieve with a mesh size of 300 μm, mixed with a V-type mixer for 30 minutes, and then dried at 200°C in the atmosphere After 30 minutes, pass through a sieve with a mesh size of 300 μm.

[0048] Next, a silicone resin "KR220L" (manufactured by Shin-Etsu Chemical Co., Ltd.) with 100 mol% of methyl groups and 100 mol% of T units was dissolved in toluene to prepare a resin solution with a solid content concentration of 4.8%. This resin solution was added and mixed so that the resin solid content was 0.15% with respect to the iron powder, heated in a...

Embodiment 2～4

[0052] Embodiment 2~4, comparative example 1

[0053] As shown in Table 1, except that the composition of the treatment liquid was changed, the compressed powder compact was produced in the same manner as in Example 1, and the element content, compact density, flexural strength, and specific resistance were measured, and are shown in Table 2 and Table 3. .

[0054] 【Table 1】

[0055]

No.

phosphorylated coating

Add elements in

Na 2 HPO 4

NaH 2 PO 4

h 3 PO 4

co 3 (PO 4 ) 2

h 2 SO 4

Cs 2 SO 4

Al(H 2 PO 4 ) 3

Example 1

P, Co, Na,

S, Cs

88.5

—

181

30

61

44

—

Example 2

P, Co, Na,

S, Cs —

150

181

30

61

44

—

Example 3

P, Co, Na,

S, Al 88.5

—

181

30

61

—

78

Example 4 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
densityaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

An iron-based soft magnetic powder for dust core has superior mechanical strength, in which effective insulation is achieved between iron powdery particles even when the amount of an insulating material is reduced for realizing high-density molding, otherwise the iron powder for dust core is also superior in thermal stability, so that electrical insulation is maintained even after a heat treatment at high temperatures, wherein, a phosphate coating and a silicone resin coating are arranged on surface of an iron-based soft magnetic matrix powder, and the phosphate coating contains P, Co, Na, and S in combination with at least one of Al and Cs.

Description

technical field [0001] The present invention relates to an iron-based soft magnetic powder for powder magnetic cores in which a high heat-resistant insulating film is laminated on the surface of soft magnetic powder such as iron powder and iron-based alloy powder (hereinafter both are collectively referred to as iron powder). The iron-based soft magnetic powder for a powder magnetic core can yield a powder magnetic core used as a magnetic core for an electromagnetic component. The powder magnetic core of the present invention is excellent in mechanical strength and the like, and is particularly excellent in specific resistance at high temperature. Background technique [0002] For magnetic cores used in AC magnetic fields, low iron loss and high magnetic flux density are required. In addition, it is also important not to be damaged during handling in the manufacturing process and winding to form a coil. In view of these points, in the field of powder magnetic cores, there ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/10C23C22/07C23C22/02H01F1/147H01F27/24H01F41/02B22F1/102B22F1/16
CPCB22F1/02H01F1/26C22C2202/02H01F41/0246H01F1/24C22C33/02B22F1/16B22F1/102H01F1/20H01F3/08
Inventor 大胁武史柳泽佳寿美三谷宏幸西田智北条启文赤城宣明
Owner KOBE STEEL LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com