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Production of nano-SiO2 for coating carbonyl iron powder

A technology for coating carbonyl iron and carbonyl iron powder, which is applied in the production field of nano-SiO2 coating carbonyl iron powder, can solve the problems such as the inability to meet the specified indicators, and achieve the effect of good matching and improving the quality of the magnetic core.

Active Publication Date: 2007-01-17
JIANGSU TIANYI ULTRA FINE METAL POWDER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of resin and phosphoric acid added determines the quality factor and magnetic permeability of the product. It is positively correlated with the quality factor and negatively correlated with the magnetic permeability. It often improves the other by sacrificing one aspect. When the quality factor and the magnetic permeability When the matching requirements are high, this traditional method cannot meet the specified indicators
[0004] No nano-SiO has been used in China so far 2 A report on coated carbonyl iron powder

Method used

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  • Production of nano-SiO2 for coating carbonyl iron powder
  • Production of nano-SiO2 for coating carbonyl iron powder
  • Production of nano-SiO2 for coating carbonyl iron powder

Examples

Experimental program
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Effect test

example 1

[0016] Example 1: ① Take 70g nano-SiO 2 , 35g alkaline silane coupling agent, 5000g ethylene glycol, 10kg carbonyl iron powder for standby;

[0017] ② SiO2 2 For dispersion pretreatment; pour 35g of alkaline silane coupling agent into ball mill for 0.5h; add 5000g of ethylene glycol, and ball mill for 0.5h;

[0018] ③Put in 10kg of carbonyl iron powder, and mill in a ball mill for 1 hour, that is, the coating is completed;

[0019] ④Take out the coated product and dry it at 150°C for 1 hour under vacuum or protective atmosphere, grind, sieve, and pack.

[0020] Coated SiO produced by the production method of the present invention 2 Powder carbonyl iron powder has the following effects:

[0021] 1. Scanning and observing the surface, the surface is obviously covered with a layer of white SiO 2 powder; observed through cross-sectional scanning, the thickness of the coating is about 40nm, which is basically consistent with the particle size characterized by the coating, see ...

example 2

[0025] Example 2: ① Take 70g nano-SiO 2 , 160g alkaline silane coupling agent, 5000g ethylene glycol, 10kg carbonyl iron powder for standby;

[0026] ② Dispersion treatment of SiO 2 ;Pour in 160g of alkaline silane coupling agent and ball mill for 4.2h; add 5000g of ethylene glycol, and ball mill for 4.2h;

[0027] ③Put in 10kg of carbonyl iron powder after dispersion treatment, and ball mill in the ball mill for 4.5h, that is, the coating is completed;

[0028] ④ Take out the coated product and dry it at 100°C for 5.5 hours under vacuum or protective atmosphere, grind, sieve, and pack.

example 3

[0029] Example 3: ① Take 70g nano-SiO 2 , 280g alkaline silane coupling agent, 5000g ethylene glycol, 10kg carbonyl iron powder for use;

[0030] ② SiO2 2 Dispersion treatment; pour 280g of alkaline silane coupling agent into ball mill for 8h; add 5000g of ethylene glycol, and ball mill for 8h;

[0031] ③Put in 10kg of carbonyl iron powder after dispersion treatment, and ball mill in the ball mill for 8 hours, that is, the coating is completed;

[0032] ④Take out the coated product and dry it at 100°C for 10 hours under vacuum or protective atmosphere, grind, sieve, and pack.

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Abstract

A process for preparing the nano-SiO2 coated carbonyl iron particles includes such steps as dispersing SiO2 nanoparticles and carbonyl iron particles by grinding, modifying the surface polarity of both particles by soluble caustic substance, coating the SiO2 nanoparticles on the surface of each carbonyl iron particle by physical adsorption, backing in vacuum or protective atmosphere, grinding, sieving and packing.

Description

Technical field [0001] The present invention relates to nanometer SiO 2 A production method of coated carbonyl iron powder. technical background [0002] Carbonyl iron powder is made of Fe(CO) 5 Spherical ultrafine iron powder with an average particle size of about 3 microns produced by pyrolysis has many special physical and chemical properties, especially for high-quality, high-permeability, low-power soft magnetic materials at high frequencies, high-frequency surface Mounting (SMD) and anti-electromagnetic interference (EMI) components, etc., have many advantages such as low cost, good reliability, and easy forming and processing. Due to SiO 2 Special physical and chemical properties, using nano-SiO 2 The magnetic core made of coated carbonyl iron powder, on the premise of effectively improving the quality factor of the magnetic core, does not reduce or slightly reduces the magnetic permeability of the magnetic core, and achieves a good match of various magnetic prope...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 高为鑫
Owner JIANGSU TIANYI ULTRA FINE METAL POWDER
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