Method for preparing silicon-iron coating type composite powder

A coating type, composite powder technology, applied in coating and other directions, can solve the problems of high preparation cost, unsuitable for large-scale industrial production, unsuitable for Si-Fe composite powder, etc., and achieves simple process and easy mass production. , the effect of uniform distribution of Si

Inactive Publication Date: 2003-08-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical co-precipitation method and the electroless plating method are relatively complicated, require appropriate chemical reactions, and need to deal with residual liquids, which are not suitable for the preparation of Si-Fe composite powder. The fluidized bed method has complicated equipment and high preparation costs, so it is not suitable for large-scale batch industrial production
According to the novelty search results of domestic and foreign patents and journals: there is no patent and report on Si-Fe coated composite powder

Method used

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  • Method for preparing silicon-iron coating type composite powder
  • Method for preparing silicon-iron coating type composite powder
  • Method for preparing silicon-iron coating type composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix Si powder with an average particle size of 1 μm and a purity of 99.99% with an appropriate amount of absolute ethanol, place it in a high-energy ball mill made of stainless steel, and mill it for 30 hours; the ball-to-material ratio is 10:1, and the speed of the ball mill is 350 rpm; airtight ball mill The tank is protected by argon to prevent oxidation during the ball milling process;

[0017] Get 6 grams of pulverized silicon powder and 94 grams of iron powder with an average particle size of 100 μm for mixed ball milling, the ball-to-material ratio is 4:1, the ball mill speed is 350 rpm, ball milled for 1 hour, and the powder after ball milling is made into a sample.

Embodiment 2

[0019] 10 grams of Si powder with an average particle size of 1 μm and a purity of 99.99% was mixed with an appropriate amount of absolute ethanol, placed in a high-energy ball mill made of stainless steel, and ball milled for 40 hours. The ball-to-material ratio is 20:1, and the rotational speed of the ball mill is 350 rpm. The airtight ball milling tank was protected by argon to prevent oxidation during the ball milling process.

[0020] Take 6.5 grams of pulverized silicon powder and 93.5 grams of iron powder with an average particle size of 100 μm for mixed ball milling, the ball-to-material ratio is 4:1, the speed of the ball mill is 350 rpm, and the ball mill is performed for 2 hours. The powder after ball milling was made into a sample, which was analyzed with an electron probe, and the results were as follows: figure 2 shown. The results show that Si is uniformly coated around Fe, and the Fe particles are not deformed. This proves that the obtained powder is Si-Fe ...

Embodiment 3

[0022] Mix Si powder with an average particle size of 1 μm and a purity of 99.99% with an appropriate amount of absolute ethanol, place it in a high-energy ball mill made of stainless steel, and mill it for 35 hours; the ball-to-material ratio is 15:1, and the speed of the ball mill is 350 rpm; The tank is protected by argon to prevent oxidation during the ball milling process;

[0023] Get 7 grams of pulverized silicon powder and 93 grams of iron powder with an average particle size of 100 μm for mixed ball milling, the ball-to-material ratio is 4:1, the ball mill speed is 350 rpm, ball milled for 1.5 hours, and the powder after ball milling is made into a sample.

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Abstract

The method for preparing silicon-iron uniformly-covered composite powder includes the following steps: (1). utilizing high-energy pulverizing equipment to pulverize micrometer-grade Si powder into nano-grade Si powder; (2). mixing 6-7 wt% of nano-grade Si powder and 93-94 wt% of micrometer-grade Fe powder, ball-grinding, ball and material ratio is 4:1, ball grinding time is 1-2 hr, so as to make the Si be uniformly distributed on the surface of Fe granules and can obtain the Si-Fe uniformly-covered composite powder. Said covered composite powder retains the original plastic deformation capability of alpha-Fe, so that it can provide acceptable material for preparing high-silicon silver-steel sheet.

Description

technical field [0001] The invention relates to a preparation method of coated composite powder. Background technique [0002] The special silicon steel sheet containing 6.5wt% silicon is a kind of soft magnetic alloy with excellent properties. Compared with the traditional silicon steel sheet (containing ~3wt% Si), it has high magnetic permeability, high saturation magnetic induction, low magnetostriction and Low iron loss and other excellent soft magnetic properties and high frequency characteristics, so it is more suitable for use in generators, transformers and various motors, electrical appliances, etc. The noise of the transformer and the realization of ultra-miniaturization and super-scaling of motors and electrical appliances, and the reduction of energy consumption are extremely beneficial. However, with the increase of Si content, the texture of silicon steel sheet becomes brittle, its processing performance is very poor, and it is difficult to be rolled and forme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/04C22C1/05C22C33/02C22C38/02
Inventor 张联盟张东明沈强员文杰李淘
Owner WUHAN UNIV OF TECH
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