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A method for insulating and wrapping FeSiAl soft magnetic alloy powder

A technology of iron-silicon-aluminum alloy and soft magnetic alloy, used in magnetic objects, magnetic materials, transportation and packaging, etc., can solve the problem that the pressing stress of the magnetic core cannot be eliminated well, and the insulating layer material has no high temperature resistance and cannot be very good. Optimize the magnetic domain structure and other issues to achieve excellent DC superposition characteristics, reduce operating procedures, and reduce material yield.

Active Publication Date: 2020-06-05
广东美瑞克微金属磁电科技有限公司
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  • Abstract
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Problems solved by technology

The insulating layer material obtained above does not have good high temperature resistance characteristics. At a temperature above 600 degrees, the insulating layer is damaged. If a lower annealing temperature is used, the compressive stress generated during the core manufacturing process cannot be well eliminated, and the The magnetic domain structure is well optimized, resulting in the disadvantages of low magnetic permeability of the magnetic core and large power loss
The patented technology provided by Guangzhou Jinnan Magnetic Materials Co., Ltd., a soft magnetic alloy powder core insulation treatment method (application number CN201510026903.1, publication number CN104607644A), uses annealed soft magnetic alloy powder, and then The surface is coated, pressed into a soft magnetic alloy powder core, and then subjected to a second vacuum dipping treatment to obtain a soft magnetic alloy powder core with excellent performance and low power loss. However, this insulating coating method has complicated procedures and brings high cost

Method used

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  • A method for insulating and wrapping FeSiAl soft magnetic alloy powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the insulation and wrapping treatment method of the Fe-Si-Al soft magnetic alloy powder of the present invention is characterized in that it comprises the following steps:

[0033] S1. Pure iron, metal silicon and electrolytic aluminum ingots are smelted and homogenized to form sendust, and then the sendust is crushed and ball-milled to obtain unannealed soft magnetic silicon-aluminum powder;

[0034] S2. Mix the non-annealed soft magnetic silicon aluminum powder and insulating material in a solvent of 1%-8% of the weight of the soft magnetic alloy powder, and the insulating material must be able to withstand the annealing of the magnetic core stress above 700°C requirements;

[0035] S3. Stir the mixture in step 2 in an airtight container and let it stand for more than 30 minutes;

[0036] S4, complete the powder annealing treatment in the annealing furnace under the protection of the atmosphere with the stirred powder;

[0037] S5. The ir...

Embodiment 2

[0043] In Example 2, take 100 g of the soft magnetic alloy powder of the traditional ball milling process with an average particle size of 50 μm that has not been annealed, and mix it with 1.5 grams of aluminum dihydrogen phosphate + 1.0 grams of silicone resin + 5 grams of alcohol The solution is fully stirred evenly in a closed container. After standing for 30 minutes, it is spread out and placed in a high-temperature annealing medium. It is integrated with traditional powder annealing to complete powder annealing + insulation coating. The annealing temperature is 850°C. The obtained powder was uniformly mixed with 0.5 g of zinc stearate lubricant to form an insulating and coated soft magnetic alloy powder. Under a pressing pressure of 78 tons, the standard 270 ring was pressed.

[0044] The performance test results are: the weight of the magnetic ring is 26.01 grams, and the magnetic permeability is 61.3. Under the test conditions of 50Khz@100mT, the measured power loss is 2...

Embodiment 3

[0047] In Example 3, take 100 g of the soft magnetic alloy powder of the traditional ball milling process with an average particle size of 50 μm that has not been annealed, mix it with 1.5 grams of organic silicon resin + 5 grams of alcohol solution, and place it in a closed container Stir well and evenly. After standing for 30 minutes, spread it out and place it in a high-temperature annealing medium. It is integrated with traditional powder annealing to complete powder annealing + insulation coating. The annealing temperature is 850°C. The obtained powder was uniformly mixed with 0.5 g of zinc stearate lubricant to form an insulating and coated soft magnetic alloy powder. Under a pressing pressure of 78 tons, the standard 270 ring was pressed.

[0048] The performance test results are: the weight of the magnetic ring is 25.86 grams, and the magnetic permeability is 60.4. Under the test conditions of 50Khz@100mT, the measured power loss is 263mW / cm3, and the inductance drops t...

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Abstract

The invention discloses an insulating and wrapping treatment method of Fe-Si-Al soft magnetic alloy powder, which comprises the following steps: S1, after melting and homogenizing pure iron, metal silicon and electrolytic aluminum ingots, forming Fe-Si-Al alloy, and manufacturing Obtain non-annealed soft magnetic silicon-alumina powder; S2, mix the non-annealed soft magnetic silicon-alumina powder and insulating material in a solvent of 1%-8% of the weight of the soft magnetic alloy powder; S3, mix the mixture in Stir in a closed container and let it stand for more than 30 minutes; S4, complete the powder annealing treatment in the annealing furnace under the protection of the atmosphere; S5, the sendust soft magnetic alloy powder after high temperature annealing, the surface An insulating coating layer with a thickness of less than 100 nanometers has been formed; step 6, mixing the annealed and insulating powder with a special lubricant for powder molding. The high-temperature annealing and insulating coating integrated method adopted in the present invention reduces a powder drying process, avoids the insulating coating drying process, and improves production efficiency.

Description

technical field [0001] The invention relates to a metal soft magnetic alloy material belonging to functional materials, and more specifically relates to an insulating and wrapping treatment method of FeSiAl soft magnetic alloy powder. Background technique [0002] Due to its extremely low power loss characteristics and good DC superposition characteristics, the Fe-Si-Al soft magnetic alloy powder core is widely used in household appliances such as photovoltaic inverters, DC charging piles, PFC circuits, energy-saving inverter air conditioners, etc. Demand for high efficiency, energy saving and miniaturization of components. Usually, the process of making sendust powder into soft magnetic alloy powder core is as follows: iron, silicon and aluminum are smelted into an alloy with uniform composition according to the composition of Sendust, and then crushed into powder by crushing balls. Therefore, the powder should be annealed at high temperature. The temperature of high tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F1/26B22F1/02B22F1/00
CPCH01F1/14791H01F1/26B22F1/102B22F1/16
Inventor 徐有为蔡勇范海强唐中飞
Owner 广东美瑞克微金属磁电科技有限公司
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