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Preparation method of a micron-sized large-diameter-thickness ratio particle shape sheet-like sendust powder with uniform particle size

A technology of sendust powder and large diameter-to-thickness ratio, which is applied in the field of ultrafine metal powder preparation, can solve the problems of small powder contact area and cannot meet the requirements of wave-absorbing materials, and achieve uniform particle size and high magnetic permeability , the effect of reducing the hardness

Active Publication Date: 2022-05-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shape of the alloy powder is spherical or irregular, resulting in a small contact area between powders, which cannot meet the requirements of absorbing materials

Method used

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  • Preparation method of a micron-sized large-diameter-thickness ratio particle shape sheet-like sendust powder with uniform particle size
  • Preparation method of a micron-sized large-diameter-thickness ratio particle shape sheet-like sendust powder with uniform particle size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The specific steps for preparing sendust aluminum powder with uniform particle size, micron-scale large diameter-thickness ratio particle morphology and flaky shape are as follows:

[0032] (1) Wash 500g of crushed ferrosilicon aluminum alloy powder with a particle size of 50-80μm with acetone, dry it, and spread it evenly on the screen. The metal softener is glyceryl stearate. Spray evenly on the sendust powder, the atomization equipment is a small electric sprayer, the atomization spray time interval is 15min, and the number of atomization is 4 times; the amount of single atomization spray is 6% of the alloy powder amount.

[0033] (2) 30 minutes after the last spraying of the metal softener solution, put the sendust powder into the annealing furnace, and anneal under the protection of nitrogen, the annealing temperature is 400°C, and the holding time is 3h.

[0034] (3) Ultrasonic dispersion of the annealed sendust aluminum alloy powder with ethanol as the medium; ul...

Embodiment 2

[0040] The specific steps for preparing sendust aluminum powder with uniform particle size, micron-scale large diameter-thickness ratio particle morphology and flaky shape are as follows:

[0041] (1) Wash 500g of broken ferrosilicon aluminum alloy powder with a particle size of 50-80μm with acetone, dry it, spread it evenly on the screen, and mix glyceryl stearate and polydimethylsiloxane with a metal softener at a volume ratio of 2:1. It is made by mixing methyl silicone oil, and the metal softener is evenly sprayed on the sendust powder with atomization equipment. The atomization equipment is a small electric sprayer. The atomization spray time interval is 30 minutes, and the number of atomization is 3 times; The amount of atomized spraying is 10% of the amount of alloy powder.

[0042] (2) 30 minutes after the last spraying of the metal softener solution, put the sendust powder into the annealing furnace, and anneal under the protection of nitrogen, the annealing temperatu...

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Abstract

The invention discloses a method for preparing sendust aluminum powder with a uniform particle size and a micron-scale large diameter-thickness ratio particle shape, which belongs to the technical field of ultrafine metal powder preparation. The flaky sendust powder prepared by this method has a high flaking rate, a thickness between 1-2 μm, uniform particle size, a diameter-thickness ratio of about 30-38:1, and good soft magnetic properties. By softening the surface of the sendust powder before ball milling, the method can greatly increase the flaking rate of the sendust powder under the premise of ensuring its magnetic properties. Flake sendust powder with large diameter-thickness ratio can further reduce the internal air gap of the magnetic ring made of flake powder. It still has high permeability and low loss at high frequency.

Description

technical field [0001] The invention belongs to the technical field of ultrafine metal powder preparation, and in particular relates to a preparation method of micron-order large-diameter-thick-ratio flaky sendust powder with high flake rate and uniform particle size. Background technique [0002] Sendust alloy, also known as Sendai alloy (Sendus alloy), was first developed in Sendai, Japan in 1932. Fe-9.6%Si-5.4%Al soft magnetic alloy, the saturation magnetostriction coefficient and the magnetocrystalline anisotropy constant are almost zero at the same time, so the sendust has high magnetic permeability and low coercive force, and the maximum magnetic permeability The rate can reach 120,000, and the saturation magnetic flux density can reach 1.05T. Moreover, it has high resistivity and low price, and is an ideal material for magnetic head cores. However, the magnetic properties of sendust are sensitive to compositional fluctuations, and they are brittle and have poor proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04C21D1/26C21D1/773C21D6/00
CPCB22F9/04C21D6/008C21D1/26C21D1/773B22F2009/043
Inventor 张学斌张博玮张华苏海林邹中秋都有为
Owner HEFEI UNIV OF TECH
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