Preparing method for fine sheet metal magnetically soft alloy powder

A flake metal, soft magnetic alloy technology, applied in the direction of inorganic material magnetism, etc., can solve the problems of affecting the magnetic permeability and mechanical strength of the core, increasing the distance between powder particles, affecting the dimensional accuracy of products, etc., and achieving easy control of powder particle size. , Small particle size, achieve the effect of product quality

Active Publication Date: 2015-08-26
有研增材技术有限公司
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Problems solved by technology

However, after the insulation pretreatment, the surface will be covered with an insulating layer, which will increase the distance between the powder particles, so that the density of the green body will decrease after the iron powder is pressed, which will affect the magnetic permeability and mechanical properties of the core. strength
In addition, most of the existing raw material powders are prepared by the atomization method and mechanical crushing method. The powder molding requires a large pressure, resulting in a large internal stress in the pressed body, which makes it difficult to demould and cause the body to crack, reducing production efficiency and increasing production costs.
In order to eliminate the internal stress, the magnetic powder core is subjected to high-temperature annealing treatment, but after the high-temperature heat treatment of the magnetic powder core molded body, the size of the magnetic powder core will change, and usually the volume expansion will occur due to high-temperature heat treatment, which not only affects the dimensional accuracy of the final product, but also the magnetic properties. can have a tendency to deteriorate

Method used

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Effect test

preparation example Construction

[0029] The preparation method of the fine flaky soft magnetic alloy powder of the present invention includes the preparation processes of alloy intermediate frequency smelting, supersonic atomization powder making, powder mechanical ball milling and annealing treatment, including the following steps:

[0030] (1) Two or three of Fe, Si, Al, Ni, and Mo with a purity greater than 99.9% are used as raw materials, and are smelted through an intermediate frequency vacuum induction furnace. The gas pressure in the smelting chamber is 0-0.50MPa, and the smelting temperature is 1550-1750 ℃; during the atomization treatment, the atomizer used is a supersonic gas atomization nozzle or a V-shaped high-pressure water atomization nozzle to carry out primary atomization on the alloy melt, and the gas atomization pressure is 0.50-10MPa (water atomization pressure is 35-70MPa). The supersonic atomizing nozzle is used to atomize the alloy melt, the atomization pressure is preferably controlled...

Embodiment 1

[0035] The preparation method of micro-flaky soft magnetic alloy FeSi6.5 powder, the method is carried out according to the following steps: first select Fe and Si with purity greater than 99.9wt% as raw materials (Si content is 6.5w%), carry out vacuum through intermediate frequency vacuum induction furnace Melting, pre-vacuum treatment, the vacuum degree reaches 1×10 -3 Pa, the smelting chamber is filled with nitrogen protection, the gas pressure in the smelting chamber is 0.20MPa, and the melting temperature is 1650°C. After the alloy is fully melted and the components are homogenized, the metal liquid flow is atomized and pulverized through a double-layer supersonic atomizing nozzle. The atomization medium is high-purity nitrogen (or argon), and the atomization pressure is controlled at 4.5MPa. The melt droplets are forcibly broken, dispersed and cooled by the atomizing gas to form tiny near-spherical powders. The atomized alloy powder is flattened by mechanical ball mil...

Embodiment 2

[0038] The preparation method of micro-flaky soft magnetic alloy FeNi50 powder, the method is carried out according to the following steps: first select Fe and Ni with a purity greater than 99.9wt% as raw materials (Ni content is 50wt%), carry out atmospheric smelting through a medium-frequency vacuum induction furnace, smelting The process adopts nitrogen protection to avoid alloy oxidation. The melting temperature of the alloy is 1750°C, and the superheat is maintained at 150°C. After the alloy is fully melted and the components are homogenized, the metal liquid flow is atomized and pulverized through the V-shaped high-pressure water atomization nozzle, and the atomization pressure is controlled at 50MPa to prepare a nearly spherical metal soft magnetic powder. Put the gas-atomized soft magnetic alloy powder and stainless steel balls into a stainless steel ball mill tank, the ball-to-material ratio is 10:1, and add 1wt% polyvinyl alcohol as powder dispersant to prevent secon...

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Abstract

The invention relates to a preparing method for fine sheet metal magnetically soft alloy powder and belongs to the technical field of metal and alloy powder preparation. The method comprises the steps that two or three of Fe, Si, Al, Ni and Mo are selected as raw materials to carry out alloy distributing; a medium-frequency induction furnace is adopted for carrying out alloy smelting; a two-flow atomization method is adopted for carrying out atomizing on a melt, and alloy powder approximately spherical is prepared; by means of mechanical milling, flattening is carried out on the alloy powder; annealing treatment is carried out on the obtained sheet powder, and by means of an ultrasonic vibrating sieve, the fine sheet metal magnetically soft alloy powder is prepared. The powder prepared through the method, the granularity ranges from 10 micrometers to 100 micrometers, the average thickness ranges from 0.1 micrometer to 5 micrometer, the radial thickness ratio ranges from 50 to 500, and the powder flattening rate reaches 90%. According to the method, the powder preparing process is simple, the production efficiency is high, the production cost is low, the quality of the magnetically soft powder core can be effectively improved, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of fine flake metal soft magnetic alloy powder, belonging to the technical field of metal and alloy powder preparation. Background technique [0002] As an important magnetic functional material, metal soft magnetic powder core has a very broad application prospect in various inductance components, power transformers and other fields with the development of miniaturization and high frequency of electronic devices. Soft magnetic powder cores with unique properties The application of magnetic powder cores in the above fields will generate huge economic benefits. Metal magnetic powder core is a powder made of metal or alloy soft magnetic material. The soft magnetic composite material prepared by powder metallurgy production process has obvious magnetic and physical properties affected by raw material powder, forming process and post-processing process. In order to improve the magnetic permeability and mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00H01F1/20
Inventor 贺会军盛艳伟赵新明赵文东张金辉边隽杰袁国良王山山
Owner 有研增材技术有限公司
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