Powder coating method for metal soft magnetic composite material and preparation method of magnet
A technology of metal magnetic powder and composite materials, which is applied in the field of preparation of soft magnetic composite materials and powder coating for metal soft magnetic composite materials, can solve the problems of inability to ensure the firm combination of nano powders, and achieve low cost, simple preparation equipment, The effect of small magnetic loss
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Embodiment 1
[0039] Put aluminum isopropoxide into deionized water, pass through 85°C water bath and magnetically stir for 40min, then drop HNO 3 And continue magnetic stirring for 10h, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:80:0.4. After the magnetic stirring is completed, continue to stand and age in a water bath at 90°C for 20 hours, and mix the AlOOH sol obtained by filtration with the water-atomized pure Fe powder with an average particle size of 35 μm used as a soft magnetic composite material, and the weight of the sol is water 2% of pure Fe powder was atomized, and then the mixture was kept in a drying oven at 150 °C for 120 min to obtain AlOOH gel-coated powder. The resulting powder was then subjected to H2 Heating to 1120°C in atmosphere for 60min. That is to get nano-Al 2 o 3 Coated magnetic powder. Then, 0.5% of the total mass of the silane coupling agent was added to the heat-treated mixture for uniform mixing, and 1% of the total ma...
Embodiment 2
[0044] Put aluminum isopropoxide into deionized water, pass through 80°C water bath and magnetically stir for 50min, then drop HNO 3 And continue the magnetic stirring for 15 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:100:0.5. After the magnetic stirring is completed, continue to stand and age in a water bath at 95°C for 25h, and mix the AlOOH sol obtained by filtration with the water atomized Fe-3.5Si powder with an average particle size of 30μm used as a soft magnetic composite material, and the weight of the sol is It is 1% of water atomized Fe-3.5Si powder, and then the mixture is kept in a drying oven at 150°C for 120min to obtain AlOOH gel-coated powder. The obtained powder was heated to 1140°C in an atmosphere of decomposed ammonia for 60 minutes. That is to get nano-Al 2 o 3 Coated magnetic powder. Then, 0.6% of the total mass of the silane coupling agent was added to the heat-treated mixture and mixed evenly, and 1.1% of ...
Embodiment 3
[0049] Put aluminum isopropoxide into deionized water, pass through a 90°C water bath and magnetically stir for 30 minutes, then drop in HNO 3 And continue magnetic stirring for 12 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:90:0.4. After the magnetic stirring is completed, continue to stand and age in a water bath at 95°C for 30 hours, and mix the AlOOH sol obtained by filtration with the water atomized Fe-6.5Si powder with an average particle size of 32 μm used as a soft magnetic composite material, and the weight of the sol It is 3% of water atomized Fe-6.5Si powder, and then the mixture is kept in a drying oven at 120°C for 150min to obtain AlOOH gel-coated powder. The resulting powder was subjected to H 2 Heated to 1150°C in atmosphere for 60min. That is to get nano-Al 2 o 3 Coated magnetic powder. Then add silane coupling agent accounting for 0.5% of the total mass to the heat-treated mixture and mix evenly, and add 1.2% sil...
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