A method for coating the surface of a soft magnetic alloy powder with a silicon dioxide insulating film layer
A soft magnetic alloy, silica technology, applied in transportation and packaging, metal processing equipment, magnetic properties of inorganic materials, etc., can solve the problems of unverified high-temperature sintering characteristics, failure to achieve coating effect, incomplete coating, etc. To achieve the effect of tight bonding, controllable thickness and good bonding
Active Publication Date: 2018-01-02
GUANGZHOU MAGNET ELECTRICITY
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Problems solved by technology
Patent No. CN200610124964 and CN201310096126 both use the method of direct mixing of magnetic powder and ferrite powder, the coating is not complete, and the complete coating effect cannot be achieved
The patent number is CN201310096126.9 The patent uses the sol-gel method to obtain ferrite particles, but the process is complicated, the operation is difficult, and its high-temperature sintering characteristics have not been verified
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Embodiment 1
[0042] A method for coating the surface of a soft magnetic alloy powder with a silicon dioxide insulating film layer, the preparation steps are as follows:
[0043] (1) Spread 16 parts by mass of calcium chloride and 30 parts by mass of ferric chloride on the bottom of the sagger;
[0044] (2) Mix 20 parts by mass of silicon powder, 5 parts by mass of calcium oxide, 14 parts by mass of sodium carbonate, and the soft magnetic alloy powder MPP to be coated with a mixer at 100 rpm for 10 minutes to ensure uniformity Mixing, and then spread the mixed raw material powder evenly in the sagger in step (1) where the chlorine source material is spread;
[0045] (3) Place the sagger in which the chlorine source substance and the raw material powder are spread together in the second step in a tube furnace with a hydrogen flow rate of 400 ml / min, and heat up to Insulate at 250°C for 0.5 hours, then continue to heat up to 1000°C at a rate of 3°C / min and bake for 0.5 hours;
[0046] (4) Tak...
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The invention discloses a method for coating the surface of a soft magnetic alloy powder with a silicon dioxide insulating film layer. The preparation method includes steps: 1) spread the chlorine source material on the bottom of the container; 2) mix the silicon source precursor, additives and soft magnetic alloy powder to be coated to obtain a mixture, and spread the mixture on another the bottom of the container; or spread the mixture on the chlorine source material; 3) place the container with the chlorine source material and the other container with the mixture in a hydrogen atmosphere for treatment; or, spread the The container of the chlorine source material and the mixed material is placed in a hydrogen atmosphere for treatment; 4) Take it out after natural annealing to room temperature to obtain the coated soft magnetic alloy powder, and then go through magnetic separation. The soft magnetic alloy powder whose surface is coated with a silicon dioxide insulating film layer is prepared according to the above method. The obtained coating layer of the present invention is uniform and has a controllable thickness, the thinnest can reach nanometer level, and has high temperature resistance, the coating layer is closely combined with the powder, and the film layer is well combined under high temperature and high pressure without falling off.
Description
technical field [0001] The invention relates to a method for coating the surface of a soft magnetic alloy powder with a silicon dioxide insulating film layer. Background technique [0002] With the development of high frequency, miniaturization, and thinning of electronic equipment, magnetic powder cores also exhibit high Bs (saturation magnetization), high μ (permeability), high Tc (Curie temperature), and low Ps (eddy current loss). ), low Hc (coercive force) trend. Compared with ferrite cores, soft magnetic alloys have significant advantages of high Bs, high μ (static magnetic permeability). However, the resistance of soft magnetic alloy materials is small, and the eddy current loss increases rapidly with the increase of frequency, which greatly limits its use at higher frequencies. In recent years, as the demand for high-power inverters, transformers, etc. in the field of new energy continues to grow, soft magnetic alloy powder cores have been widely used as core compo...
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IPC IPC(8): B22F1/02H01F1/24
CPCH01F1/24B22F1/16
Inventor 汪小明刘波郭春生刘凯
Owner GUANGZHOU MAGNET ELECTRICITY