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CN-121983405-A - High-performance soft magnetic composite material based on rapid heat treatment technology and preparation and application methods thereof

CN121983405ACN 121983405 ACN121983405 ACN 121983405ACN-121983405-A

Abstract

The invention discloses a high-performance soft magnetic composite material based on a rapid heat treatment technology and a preparation and application method thereof. The high-performance soft magnetic composite material is obtained by pretreating air-atomized FeSiAl powder in 80 ℃ hot water for 2 hours and then rapidly treating the air-atomized FeSiAl powder in 1000 ℃ for 5 seconds in rapid heat treatment equipment, and an Al 2 O 3 insulating layer with the thickness of 10-20 nm is coated on the surface of the air-atomized FeSiAl powder, and the resistivity of the insulating layer is higher, so that the saturation magnetic induction intensity and the cutoff frequency of the material can be remarkably improved, and the high-frequency loss can be reduced. The soft magnetic composite material is mixed with silicone resin, pressed and formed, and annealed at 600-750 ℃ for 1-2 hours in a protective atmosphere, can be applied to MHz frequency band high-efficiency power supply systems, such as Buck, boost, LLC resonant converters, isolated DC-DC converters or PFC circuits, and has important industrial application value.

Inventors

  • SHAN AO
  • ZHANG XUEFENG
  • ZHANG ERPAN
  • TIAN ZHAOBO

Assignees

  • 杭州电子科技大学

Dates

Publication Date
20260505
Application Date
20260309

Claims (8)

  1. 1. The high-performance soft magnetic composite material based on the rapid heat treatment is characterized by comprising gas atomization FeSiAl powder and an Al 2 O 3 insulating layer coated on the surface, wherein the thickness of the insulating layer is 10-20 nm.
  2. 2. The high-performance soft magnetic composite material based on rapid thermal processing according to claim 1, wherein the high-performance soft magnetic composite material is obtained by pretreating gas atomized FeSiAl powder in 80-90 ℃ hot water for 1-3 hours and then performing thermal processing in rapid thermal processing equipment at 900-1100 ℃ for 1-30 seconds.
  3. 3. The preparation method of the high-performance soft magnetic composite material based on the rapid thermal treatment technology is characterized by comprising the steps of pre-treating gas atomization FeSiAl powder in 80-90 ℃ hot water for 1-3 hours, and then carrying out thermal treatment in rapid thermal treatment equipment at 900-1100 ℃ for 1-30 seconds.
  4. 4. A process for the preparation of a high-performance soft magnetic composite material based on rapid thermal processing techniques as claimed in claim 3, characterized in that the aerosolized FeSiAl powder is pre-treated in 80℃hot water for 2 hours, followed by a treatment in a rapid thermal processing apparatus at 1000℃for 5 seconds.
  5. 5. The method for preparing the high-performance soft magnetic composite material based on the rapid thermal processing technology as claimed in claim 3, wherein the method comprises the following steps: the D50 of the aerosolized fesai powder was 21 μm.
  6. 6. An application of a high-performance soft magnetic composite material based on a rapid heat treatment technology is characterized in that the high-performance soft magnetic composite material according to claim 1 or 2 or the high-performance soft magnetic composite material prepared by the method according to any one of claims 3-5 is applied to a power system in a MHz frequency band.
  7. 7. The method of claim 6, wherein the high-performance soft magnetic composite material is mixed with silicone resin, and is subjected to compression molding and annealing at 600-750 ℃ for 1-2 hours in a protective atmosphere to prepare the electronic component required by the MHz band power system.
  8. 8. The method of claim 6, wherein the power system is Buck, boost, LLC resonant converter, isolated DC-DC converter, PFC, or a combination thereof.

Description

High-performance soft magnetic composite material based on rapid heat treatment technology and preparation and application methods thereof Technical Field The invention belongs to the technical field of electronic materials, relates to a soft magnetic composite material, and in particular relates to a high-performance soft magnetic composite material based on a rapid thermal processing technology (RTP) and a preparation method and an application method thereof. Background The metal soft magnetic composite material (magnetic powder core) is a soft magnetic material with high saturation magnetic flux and high resistivity, which is formed by insulating and coating soft magnetic alloy, and is widely applied to inductors, reactors and transformers. With the development of artificial intelligence technology, higher requirements are put on the efficiency and the size of a high-performance AI chip and a server power supply, wherein a soft magnetic device is used as an energy conversion core, and with the application of a wide bandgap semiconductor, higher requirements are put on the high-frequency performance of a soft magnetic composite material. The traditional soft magnetic composite material has the problems of high hysteresis loss, large eddy current loss, low cut-off frequency and the like in the MHz frequency band. The existing insulating layer preparation methods such as resin coating, phosphate passivation and the like have obvious magnetic dilution effect, and influence the saturation magnetic induction intensity and the magnetic permeability. The in-situ oxidation technology can realize insulation without introducing non-magnetic substances, is hopeful to relieve structural contradiction between hysteresis loss and eddy current loss, and obtains the soft magnetic composite material with high saturation magnetic induction intensity, high magnetic permeability and low loss at high frequency. However, the method is limited by the component segregation phenomenon caused by high-temperature diffusion of atoms, and the existing in-situ oxidation technology often adopts a low-temperature oxidation technology, so that the problems of long reaction period, low resistivity, large thickness, reduced magnetic performance and the like of an insulating layer exist. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a high-performance soft magnetic composite material based on a rapid thermal processing technology (RTP) and a preparation and application method thereof, wherein an ultrathin high-resistivity oxide composite insulating layer is formed on the surface of powder in situ through high-temperature short-time treatment, so that the soft magnetic composite material with high saturation induction intensity, low loss and high cutoff frequency is realized, and the high-performance soft magnetic composite material is particularly suitable for an efficient power conversion device in a MHz frequency band. The high-performance soft magnetic composite material based on the rapid heat treatment technology comprises gas atomization FeSiAl powder and an Al 2O3 insulating layer coated on the surface. The thickness of the insulating layer is 10-20 nm. Preferably, the high-performance soft magnetic composite material is obtained by pretreating gas-atomized FeSiAl powder in 80-90 ℃ hot water for 1-3 hours and then carrying out heat treatment in rapid heat treatment equipment at 900-1100 ℃ for 1-30 seconds. The preparation method of the high-performance soft magnetic composite material based on the rapid heat treatment technology comprises the following steps: Step 1, preparing raw materials, namely selecting gas atomization FeSiAl powder. And 2, hot water pretreatment, namely treating FeSiAl powder in hot water at 80-90 ℃ for 1-3 hours to form a uniform initial oxide layer. And 3, carrying out rapid heat treatment, namely treating the pretreated powder in rapid heat treatment equipment at 900-1100 ℃ for 1-30 seconds, diffusing Al atoms in the FeSiAl matrix to the surface at high temperature, and reacting with surface oxides to generate the high-resistivity Al 2O3 insulating layer. Preferably, the particle size D50 of the aerosolized fesai powder is 15-30 μm. Preferably, the rapid thermal processing is performed at a temperature of 1000 ℃ for a processing time of 5 seconds. The application method of the high-performance soft magnetic composite material based on the rapid heat treatment comprises the steps of mixing the soft magnetic composite material prepared by the method with silicon resin, performing compression molding, and annealing for 1-2 hours at 600-750 ℃ in a protective atmosphere, and applying the soft magnetic composite material to the iron cores of Buck, boost, LLC resonant converters, isolated DC-DC converters or PFC inductors or other electronic elements in the MHz frequency band. The invention has the following beneficial effects: 1. According to the invention, on the basis of