Nano-crystalline magnetic powder core with magnetic conductivity of mu=60

Abstract

The invention discloses a nano-crystalline magnetic powder core with magnetic conductivity of mu=60. The nano-crystalline magnetic powder core is prepared according to the following steps of: carrying out heat treatment on an iron base non-crystalline thin tape prepared via a rapid cooling method, and the iron base non-crystalline thin tape is converted into a nano-crystalline thin tape; obtaining nano-crystalline metal powders after the nano-crystalline thin tape is smashed; ball-milling and reshaping the nano-crystalline metal powders; screening the nano-crystalline metal powders, and mixing the screened nano-crystalline metal powders into powders distributed in particles, wherein the powders comprise 90-98 percent of first powder passing through a minus 200 mesh and 2-10 percent of second powder passing through a minus 150 - above 200 mesh; mixing the mixed nano-crystalline metal powders with a bonding agent, and shaping the magnetic powder core via compression; and annealing on the shaped magnetic powder core, and coating the magnetic powder core with insulation resin. By the adoption of the technical scheme, the magnetic powder core is provided with stable magnetic conductivity, loss value and direct-current polarization capability.

Description

[0001] This application is

[0002] The application date is: June 19, 2012

[0003] The application number is: 201210206560.3

[0004] The title of the application is: a divisional application of a patent application for a preparation method of a high-performance nanocrystalline magnetic powder core. technical field

[0005] The invention relates to a nanocrystalline magnetic powder core with a magnetic permeability μ=60. Background technique

[0006] In power electronic equipment, noise is the main source of circuit interference, so various filter devices must be used to reduce noise. As the main component of the differential mode inductor, the magnetic powder core plays a key role in the filter. At present, the magnetic powder core products mainly include iron powder cores, sendust magnetic powder cores, iron-nickel magnetic powder cores, MPP magnetic powder cores, etc. Conventional iron powder cores are cheap, but have poor high-frequency characteristics. Now when de...

Examples

example 1

[0032] The iron-based amorphous thin strips prepared by the rapid cooling method were heat-treated in an inert gas at 580° C. for 1 hour to obtain nanocrystalline thin strips; they were broken and shaped; 90% of the first powder of -200 mesh was selected and 10% of the second powder of -150 ~ +200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic powder core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 1 with the specifications of Φ26.9 / Φ14.7×11.2 (that is, the outer diameter is 26.9mm, the inner diameter is 14.7mm, and the height is 11.2mm) is obtained.

example 2

[0034] Heat-treat the iron-based amorphous thin strips prepared by the rapid cooling method in an inert gas at 620° C. for 1 hour to obtain nanocrystalline thin strips; crush and shape them; select 90% of the first powder of -200 mesh and 10% of the second powder of -150 ~ +200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic powder core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 2 with specifications of Φ26.9 / Φ14.7×11.2 (that is, outer diameter 26.9mm, inner diameter 14.7mm, height 11.2mm) was obtained.

example 3

[0036] The iron-based amorphous thin strips prepared by the rapid cooling method were heat-treated in an inert gas at 620°C for 1 hour to obtain nanocrystalline thin strips; they were crushed and shaped; 95% of the first powder of -200 mesh was selected and 5% of the second powder of -150 ~ +200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic powder core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 3 with specifications of Φ26.9 / Φ14.7×11.2 (that is, outer diameter 26.9mm, inner diameter 14.7mm, height 11.2mm) was obtained.

[0001] This application is

[0002] The application date is: June 19, 2012

[0003] The application number is: 201210206560.3

[0004] The title of the application is: a divisional application of a patent application for a preparation method of a high-performance nanocrystalline magnetic powder core. technical field

[0005] The invention relates to a nanocrystalline magnetic powder core with a magnetic permeability μ=60. Background technique

[0006] In power electronic equipment, noise is the main source of circuit interference, so various filter devices must be used to reduce noise. As the main component of the differential mode inductor, the magnetic powder core plays a key role in the filter. At present, the magnetic powder core products mainly include iron powder cores, sendust magnetic powder cores, iron-nickel magnetic powder cores, MPP magnetic powder cores, etc. Conventional iron powder cores are cheap, but have poor high-frequency characteristics. Now when de...

Examples

example 1

[0032] The iron-based amorphous thin strips prepared by the rapid cooling method were heat-treated in an inert gas at 580° C. for 1 hour to obtain nanocrystalline thin strips; they were broken and shaped; 90% of the first powder of -200 mesh was selected and 10% of the second powder of -150 ~ +200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic powder core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 1 with the specifications of Φ26.9 / Φ14.7×11.2 (that is, the outer diameter is 26.9mm, the inner diameter is 14.7mm, and the height is 11.2mm) is obtained.

example 2

[0034] Heat-treat the iron-based amorphous thin strips prepared by the rapid cooling method in an inert gas at 620° C. for 1 hour to obtain nanocrystalline thin strips; crush and shape them; select 90% of the first powder of -200 mesh and 10% of the second powder of -150 ~ +200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic powder core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 2 with specifications of Φ26.9 / Φ14.7×11.2 (that is, outer diameter 26.9mm, inner diameter 14.7mm, height 11.2mm) was obtained.

example 3

[0036] The iron-based amorphous thin strips prepared by the rapid cooling method were heat-treated in an inert gas at 620°C for 1 hour to obtain nanocrystalline thin strips; they were crushed and shaped; 95% of the first powder of -200 mesh was selected and 5% of the second powder of -150 ~ +200 mesh, mixed with 5wt‰ sodium silicate, through compression molding, select the magnetic powder core for annealing, and at the same time pass nitrogen into the heat treatment furnace, the temperature is 500 ° C, the time is 2 hours, and finally The surface of the magnetic powder core is coated with epoxy resin paint. The nanocrystalline magnetic powder core product 3 with specifications of Φ26.9 / Φ14.7×11.2 (that is, outer diameter 26.9mm, inner diameter 14.7mm, height 11.2mm) was obtained.

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