Surface anti-oxidation treatment method of NdFeB magnetic powder
A treatment method and pre-oxidation treatment technology, applied in inductor/transformer/magnet manufacturing, metal processing equipment, electrical components, etc., can solve the problems of difficult to control surface modification process, high cost of electroplating, and large environmental pollution, and achieve high efficiency The effect of rapid magnetic powder surface modification treatment, improving oxidation resistance and increasing bulk density
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Embodiment 1
[0018] NdFeB permanent magnet 10um ultra-fine powder is spread on the conveyor belt with a thickness of 1mm, and passes through the spray evaporation chamber at 0.5m / min. The oxidation temperature is 60°C and the relative humidity is 80%. The spray evaporation solution is a composite solution. The solution contains Mass concentration 2wt.% dichromate solution and mass concentration 3wt.% phosphoric acid solution; Gained pre-oxidized NdFeB ultra-fine magnetic powder is tiled on the conveyor belt with a thickness of 1mm again and passes through the spray evaporation chamber at 0.5m / min. , the spray-evaporated solution is 1-5wt.% sodium bisulfite solution, and a spray evaporator is added at the outlet of the evaporation chamber to spray and evaporate the sodium hydroxide solution, and the PH=9 and temperature of the moisture are controlled by adjusting the evaporation rate. The temperature is 50°C and the relative humidity is 80%. Finally, the NdFeB ultra-fine magnetic powder is s...
Embodiment 2
[0020] The NdFeB permanent magnet 20-40um fine powder is spread on the conveyor belt with a thickness of 1.5mm, and passes through the spray evaporation chamber at 0.4m / min. The oxidation temperature is 60°C and the relative humidity is 80%. The spray evaporation solution is a composite solution. The solution contains a mass concentration of 1wt.% dichromate solution and an amount concentration of 4wt.% phosphoric acid solution; the resulting pre-oxidized NdFeB ultrafine magnetic powder is spread on the conveyor belt with a thickness of 1mm and passes through the spray evaporation chamber at 0.5m / min , at this time, the solution evaporated by spraying is a certain amount of sodium bisulfite solution, and a spray evaporator is added at the outlet end of the evaporation chamber to spray evaporate the sodium hydroxide solution, and the PH=10 of the moisture is controlled by adjusting the evaporation rate, and the temperature is 60°C, relative humidity 70%; finally, the NdFeB ultra...
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