Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material

A soft magnetic alloy and powder technology is applied in the field of coating powder to prepare soft magnetic composite materials, and the field of powder coating of iron-based alloy soft magnetic composite materials, which can solve the problems of limited powder quantity, complicated process and low production efficiency, etc. Achieve good magnetic properties and frequency stability, improve compactness and high resistivity

Active Publication Date: 2015-12-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Patent WO1997030810 directly adopts the method of soaking metal magnetic powder in phosphoric acid solution to achieve coating. The insulating layer covered by this method is uniform and the thickness is easy to control. However, the heat-resistant temperature of the magnet is not high. When the heat treatment exceeds 550 ° C, the phosphating layer is easily damaged. loss of insulation
However, Chinese patents 201310351622.4 and 201310096126.9 use the sol-gel method to achieve Al 2 o 3 The coating of Fe powder with soft magnetic ferrite, the process of preparing sol-gel is relatively complicated, time-consuming and low in production efficiency
In addition, Chinese patent 201310522883.8 uses microwave-assisted treatment to obtain soft ferrite-coated metal

Method used

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  • Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material
  • Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material

Examples

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Example Embodiment

[0042] Example 1:

[0043] Take 100 grams of Fe-9Si-6Al alloy powder with an average particle size of 41μm, keep it at 800°C for 20 minutes in a muffle furnace, and cool with the furnace; put the cooled powder into a beaker containing 40ml of 1mol / L hydrochloric acid , And stir with a glass rod for 20 minutes to clean the surface of the powder; then rinse with deionized water several times until the pH is about 6-7; the cleaned powder is dried at 120°C for 120 minutes; then the powder is dried in a hydrogen furnace The medium is kept at 1000°C for 60 minutes, and after cooling with the furnace, the required coating powder is obtained. Add 0.4% silane coupling agent to the coated powder and mix well, then add 1% silicone resin and mix well; put the mixed material in a drying oven at 120°C and dry for 120 minutes; disintegrate the cooled material 100 mesh sieve; add 0.3% zinc stearate lubricant to the obtained powder under the sieve and mix evenly; then press 1000MPa pressure to f...

Example Embodiment

[0047] Example 2:

[0048] Take 100 grams of Fe-3.5Si alloy powder with an average particle size of 32μm, heat it in a muffle furnace at 900°C for 30 minutes, and then cool it with the furnace; put the cooled powder into a 50ml phosphoric acid solution with a concentration of 10mol / L In a beaker, stir with a glass rod for 30 minutes to clean the surface of the powder; then rinse with deionized water several times until the pH is about 6-7; the cleaned powder is dried at 150°C for 100 minutes; then the powder is dried in Heat in a hydrogen furnace at 900°C for 60 minutes. After cooling, the required coating powder will be obtained; add 0.5% silane coupling agent to the coating powder and mix well, then add 0.8% silicone resin and mix well; mix well Put the materials in a drying oven at 150°C and dry for 90 minutes; crush the cooled materials through a 100-mesh sieve; add 0.4% lithium stearate lubricant to the resulting powder and mix uniformly; then press 900MPa pressure to form a...

Example Embodiment

[0052] Example 3:

[0053] Take 200 grams of Fe-6.5Si alloy powder with an average particle size of 36μm, heat it in a muffle furnace at 900°C for 30 minutes, and then cool it with the furnace; put the cooled powder into a beaker containing 100ml of 3mol / L hydrochloric acid. Stir with a glass rod for 40 minutes to clean the surface of the powder; then rinse with deionized water several times until the pH is about 6-7; heat the cleaned powder at 140°C for 90 minutes and dry; then protect the powder in argon Heat treatment at 900°C for 30 minutes in a thermal heat treatment furnace, and obtain the required coating powder after cooling. Add 0.7% silane coupling agent to the coated powder and mix well, then add 0.4% silicone resin and mix well; put the mixed material in a drying oven at 130°C and dry for 90 minutes; break the cooled material 60 mesh sieve; add 0.3% zinc stearate lubricant to the obtained powder and mix evenly; then press 1100MPa pressure to form an outer diameter 20...

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Abstract

The invention relates to a coating method for iron-based magnetically soft alloy powder and a preparation method of soft magnet composite material. The coating method for iron-based magnetically soft alloy powder comprises the following steps: carrying out accelerated oxidation on iron-based magnetic metal powder at high temperature, forming an oxide layer on the surface of the powder and then carrying out acid pickling, thus obtaining powder with surface coated with SiO2, Al2O3 and Cr2O3 oxides. The preparation method of the soft magnet composite material comprises the following steps: adding coupling agent, silicon resin and lubricating agent to the coated powder, carrying out pressing forming, and then carrying out annealing heat treatment, thus obtaining the soft magnet composite material. According to the invention, the advantage that an oxide produced in reaction of elements including Si, Al and Cr contained in the iron-based magnetically soft alloy powder with oxygen is high in electrical resistivity, small in thermal expansion coefficient and steady in chemical performance and can resist high temperature is fully utilized; the adopted coating technology is to produce a coating layer in situ on the surface of the alloy magnetic powder, and is simple in process, easy to operate and low in cost; the metal soft magnet composite material prepared by adopting the method disclosed by the invention has good magnetic property and frequency stability.

Description

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Claims

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Application Information

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Owner CENT SOUTH UNIV
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