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

Iron powder for dust core

A powder magnetic core, iron powder technology, applied in the direction of magnetic core/yoke, magnetic objects, magnetic materials, etc., can solve the problem of limited degrees of freedom, etc., and achieve the effect of low hysteresis loss

Active Publication Date: 2015-12-09
JFE STEEL CORP
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetic steel sheets are laminated to form a magnetic core, so the degree of freedom in shape is limited

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Iron powder for dust core
  • Iron powder for dust core
  • Iron powder for dust core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The iron powder used in this embodiment is set to be 10 kinds of atomized pure iron powders with different apparent density, D50, crystal grain size, amount of inclusions and micro-Vickers hardness.

[0076] In addition, the apparent density is 3.8g / cm 3 The above iron powder is gas atomized iron powder, the apparent density is lower than 3.8g / cm 3 The iron powder is water atomized iron powder. Regarding the composition, any powder is C<0.005 mass%, O<0.10 mass%, N<0.002 mass%, Si<0.025 mass%, P<0.02 mass%, S <0.002% by mass.

[0077] [Table 1]

[0078] Table 1

[0079]

[0080]These powders were subjected to insulating coating with a silicone resin. The silicone resin was dissolved in toluene to prepare a resin diluted solution so that the resin content was 0.9% by mass, and then, the powder was mixed with the resin diluted solution so that the addition rate of the resin to the powder was 0.15% by mass. Allow to air dry. After drying, a resin sintering treatme...

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
Apparent densityaaaaaaaaaa
Apparent densityaaaaaaaaaa
Crystal particle sizeaaaaaaaaaa
Login to View More

Abstract

According to the present invention, an iron powder which is to be used for the production of a dust core and which exhibits a low hysteresis loss even after molding and stress relief annealing can be obtained by adjusting the apparent density of an iron powder for a dust core to 3.8g / cm3 or more, the mean particle diameter (D50) of the iron powder to 80μm or more, the grain diameters in the insides of at least 60% of the particles which constitute the iron powder and which are 100μm or more in diameter to 80μm or more, the area fraction of inclusions in the iron powder to 0.4% or less relative to the area of the matrix of the powder, and the micro Vickers hardness (test force: 0.245N) in the cross section of the iron powder to 90Hv or less.

Description

technical field [0001] The present invention relates to an iron powder for a powder magnetic core used for producing a powder magnetic core having a large crystal grain size and low hysteresis loss even after molding and stress relief annealing. Background technique [0002] Magnetic cores used in motors, transformers, and the like are required to have characteristics such as high magnetic flux density and low iron loss. Conventionally, cores in which magnetic steel sheets are laminated have been used as such cores, but in recent years, dust cores have attracted attention as core materials for electric motors. [0003] The biggest feature of the dust core is that it can form a three-dimensional magnetic circuit. Magnetic steel sheets are laminated to form a magnetic core, so the degree of freedom in shape is limited. However, in the case of a powder magnetic core, since insulation-coated soft magnetic particles are pressurized and molded, as long as there is a die, a degre...

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
IPC IPC(8): B22F1/00C22C38/00H01F1/24B22F1/05
CPCH01F1/24B22F1/0011C22C38/00C22C2202/02B22F1/05B22F1/052C22C38/001C22C38/004H01F1/147H01F1/20H01F3/08
Inventor 高下拓也中村尚道
Owner JFE STEEL CORP
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