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A process for preparing sendust powder and making magnetic cores by using non-vacuum air atomization

A technology of sendust powder and sendust, which is applied in the field of preparation of low-cost and low-loss soft magnetic alloy powder, can solve problems such as easy furnace blockage, excessive slag, complicated process, etc., and achieve the effect of avoiding furnace blockage

Active Publication Date: 2020-06-05
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the powder prepared by vacuum air atomization is of good quality, the equipment investment is large and the process is complicated, resulting in the powder production being limited by the equipment and the cost remains high
[0004] Although the existing non-vacuum air atomization has advantages in equipment capacity and cost, the oxygen content in the powder will increase during the smelting and atomization process, and the aluminum in molten steel containing aluminum will be produced due to high temperature and oxygen in the atmosphere. Intense reaction, oxidation produces a large amount of slag, which is easy to occur during the preparation of gas-atomized iron-silicon-aluminum. Severe slag is too much, and it is easy to block the furnace, which hinders the normal production of gas-atomized iron-silicon-aluminum

Method used

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  • A process for preparing sendust powder and making magnetic cores by using non-vacuum air atomization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the mass fraction of 100%, take 9.5% of 75% Si ferrosilicon alloy, 5% of aluminum particles, 0.2‰ of carbon powder, 0.5‰ of slag remover, and the balance is 99.9% of pure iron, and prepare gas-atomized iron-silicon-alumina according to the smelting process. A 6.0 leak nozzle was selected, the atomization pressure was 3.0Mpa, and the powder yield of the prepared powder was 75%. The physical and chemical test results of the powder are shown in Table 1;

[0032] Take 1kg of 200-mesh sendust powder to a temperature-controllable stirring pot, add 100ml of 30% phosphoric acid aqueous solution, the phosphoric acid addition accounts for 2% of the sendust powder weight ratio, and after stirring continuously for 1 hour, the temperature of the stirring pot rises to 120°C. Roast until dry. After sieving, put the powder into an annealing furnace protected by nitrogen and anneal at high temperature for 2 hours, then add 50 g of high-temperature binder water glass, and con...

Embodiment 2

[0035] According to the mass fraction of 100%, take 9.8% of 75% Si ferrosilicon alloy, 5.8% of aluminum particles, 0.2‰ of carbon powder, 0.5‰ of slag remover, and the balance is 99.9% of pure iron, and prepare gas-atomized iron-silicon-aluminum according to the smelting process. The 6.0 leak nozzle is selected, the atomization pressure is 3.0Mpa, and the powder yield of the prepared powder is 76%;

[0036] Take 1 kg of 200-mesh sendust powder to a temperature-controllable stirring pot, add 100 ml of 30% phosphoric acid aqueous solution, the amount of phosphoric acid added accounts for 2% by weight of the sendust powder, and after stirring continuously for 1.5 hours, the temperature of the stirring pot rises to 80°C. Roast until dry. After sieving, put the powder into a nitrogen-protected annealing furnace for annealing at 1000°C for 2 hours, then add 25g of composite phosphate and 25g of silica sol, and continue stirring until dry. Add 30g of zinc stearate lubricating powder,...

Embodiment 3

[0039] According to the mass fraction of 100%, take 10% of 75% Si ferrosilicon alloy, 6% of aluminum particles, 0.2‰ of carbon powder, 0.5‰ of slag remover, and the balance is 99.9% of pure iron, and prepare gas-atomized iron-silicon-alumina according to the smelting process. The 6.0 leak nozzle is selected, the atomization pressure is 3.0Mpa, and the powder yield of the prepared powder is 77%;

[0040] Take 1kg of 200 mesh sendust powder to a temperature-controllable stirring pot, add 100ml of 30% phosphoric acid aqueous solution, the phosphoric acid addition accounts for 2% of the sendust powder weight ratio, and after 2 hours of uninterrupted stirring, the temperature of the stirring pot rises to 130°C. Roast until dry. After sieving, put the powder into a nitrogen-protected annealing furnace at 800°C for 2 hours for annealing, then add 25 g of potassium silicate and 25 g of silica sol, and continue stirring until dry. Add 30g of zinc stearate lubricating powder, stir evenl...

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Abstract

The invention relates to a process for preparing sendust powder and making a magnetic core by using non-vacuum air atomization. By adding suitable additives and a suitable smelting process, the violent oxidation of aluminum at high temperature can be minimized to form a large amount of slag, and atomization can be avoided. When the furnace is blocked, the powder can be continuously prepared. After the prepared powder is sieved, it is subjected to high-temperature annealing treatment and insulation coating treatment. Through the pressing molding and high-temperature annealing process, the μ60 sendust core 100K / 100mT loss of 500mW is realized. / cm 3 ; Superposition performance 100Oe: 63%; 50Oe: 83%.

Description

technical field [0001] The invention relates to a method for preparing low-cost and low-loss soft magnetic alloy powder, in particular to a method for preparing iron-silicon-aluminum powder by non-vacuum air atomization. Background technique [0002] Powder preparation is the first step and the most critical part of making alloy magnetic powder cores. The conventional preparation methods include atomization method, crushing method, etc. Gas atomization is a common method for preparing metal powder. According to the smelting equipment The difference can be divided into vacuum air atomization and non-vacuum air atomization. When preparing high-value powders such as iron-nickel and iron-nickel-molybdenum, some powder manufacturers use vacuum air atomization to prepare high-quality iron-nickel and iron-nickel-molybdenum powders. During the smelting process of sendust, a large amount of slag will be produced due to high temperature oxidation, which is very easy to block the nozz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B22F1/00B22F3/02B22F3/24H01F1/147
CPCH01F1/14791B22F3/02B22F3/24B22F9/082B22F2998/10B22F2009/0848B22F2009/0844B22F2003/248B22F2003/242B22F1/142B22F1/10
Inventor 童轶龙
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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