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Nano iron powder speciall for soft magnetic material

A technology of nano-iron powder and soft magnetic materials, applied in the direction of magnetism of inorganic materials, can solve the problems of short service life of stored signals, low magnetic permeability, low storage capacity, etc.

Inactive Publication Date: 2007-06-27
王惠民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is provided to solve the problems existing in the prior art such as low recording density, low storage capacity, large storage signal distortion, short storage signal life, low magnetic permeability, large loss, and unsatisfactory saturation magnetization. A special nano-iron powder for soft magnetic materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: a kind of nano-iron powder special for soft magnetic materials is made by the following method,

[0014] Under the condition of -5°C, the frequency of high-frequency cutting is set at 5000 times per minute, and the iron powder particles are cut at high speed to produce nano-iron powder, and the sorting (10 μm as an example) D3=15nm, D25=30nm, D50 = 50nm, D75 = 75nm, D97 = 100nm powder material with relatively concentrated particle distribution, and then carry out an anti-oxidation coating with a thickness of 2nm on the iron powder particles. The specific coating method is to add 3% ( v / v) pure oxygen forms an oxide layer with a thickness of 8nm on the surface of the metal powder particles. In the high-temperature tunnel furnace, adjust the temperature to 50°C and inject an inert gas with a dew point ≤ 6-10 in a volume ratio of 4:6 The injection time of N and He is controlled at 45 minutes, so that the inert gas can fully penetrate into the oxide layer on t...

Embodiment 2

[0015] Embodiment 2: a kind of nano-iron powder special for soft magnetic materials is made by the following method,

[0016] Under the condition of -25°C, the frequency of high-frequency cutting is set at 4000 times per minute, and the iron powder particles are cut at high speed to produce nano-iron powder, and the sorting (10 μm as an example) D3=15nm, D25=30nm, D50 = 50nm, D75 = 75nm, D97 = 100nm powder material with relatively concentrated particle distribution, and then carry out an anti-oxidation coating with a thickness of 3nm on the iron powder particles. The specific coating method is to add 20% iron powder during processing. Pure oxygen forms an oxide layer with a thickness of 12nm on the surface of metal powder particles. In a high-temperature tunnel furnace, adjust the temperature to 510°C and inject inert gases N and He with a dew point ≤ 6 to 10 at a ratio of 4:6. The injection time It is controlled within 30 minutes, and the inert gas is allowed to fully penetra...

Embodiment 3

[0017] Embodiment 3: a kind of nano-iron powder special for soft magnetic materials is made by the following method,

[0018] Under the condition of -20°C, the frequency of high-frequency cutting is set at 4500 times per minute to carry out high-speed cutting of iron powder particles to produce nano-iron powder, and sort out (10 μm as an example) D3 = 15nm, D25 = 30nm, D50 = 50nm, D75 = 75nm, D97 = 100nm particle distribution powder material, and then carry out anti-oxidation coating with a thickness of 2nm on the iron powder particles. The specific coating method is to add 10% pure oxygen while processing. Form an oxide layer with a thickness of 10nm on the surface of the metal powder particles. In the high-temperature tunnel furnace, adjust the temperature to 350 ° C, inject inert gases N and He with a dew point ≤ 6 to 10 in a ratio of 4:6, and control the injection time at 37 Minutes, let the inert gas fully penetrate into the oxide layer on the surface of the metal powder ...

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Abstract

The present invention relates to nanometer metal powder, and is especially nanometer iron powder special for soft magnetic material. At temperature of -10 deg.c to -25 deg.c, iron powder grains are high speed cut to produce the nanometer iron powder with D3=15 nm, D25=30 nm, D50=50 nm, D75=75 nm and D97=100 nm; and the nanometer iron powder is then coated with antioxidant layer of 2-3 nm thickness. The nanometer metal powder may be used for producing soft magnetic material with excellent performances, including record density, memory amount, stored signal fidelity, etc.

Description

technical field [0001] The invention relates to a nano-scale metal powder, in particular to a special nano-iron powder for soft magnetic materials. Background technique [0002] The development of soft magnetic materials has gone through the process of crystalline state, amorphous state, and nano-microcrystalline state. Nano-made crystalline metal soft magnetic materials have excellent performance, high permeability, low loss, and high saturation magnetization. They have been used in aerospace industry, national defense construction, microelectronics industry, switching power supply, and transformers. Sensors, etc., can realize the miniaturization, light weight, high frequency and multifunctionalization of devices, and have developed rapidly in recent years. Magnetoelectronic nanostructured devices are the most influential major achievements at the end of the 20th century. In addition to the giant magnetoresistance effect readout head, MRAM, and magnetic sensors, the resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/04H01F1/20
Inventor 王惠民
Owner 王惠民
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