Method of preparing sheet-like carbonyl iron powder with plasma assisted ball milling

A carbonyl iron powder and plasma technology, which is applied to carbonyl iron and other directions, can solve the problems of affecting the performance and product quality of flake carbonyl iron powder, difficult to stabilize product quality, low production efficiency, etc., and achieves reduction of ball milling time and high transformation efficiency. , the effect of great flexibility

Active Publication Date: 2017-07-14
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The powder after ball milling needs to be dispersed, solid-liquid separation, drying, grading and other processes, the production efficiency is low and it is difficult to ensure the stability of product quality, which will also affect the performance of flake carbonyl iron powder and the quality of subsequent products

Method used

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  • Method of preparing sheet-like carbonyl iron powder with plasma assisted ball milling
  • Method of preparing sheet-like carbonyl iron powder with plasma assisted ball milling
  • Method of preparing sheet-like carbonyl iron powder with plasma assisted ball milling

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) The indeterminate shape (which can be spherical, ellipsoid or other shapes) carbonyl iron powder with an average particle size of 20 μm is ball-milled with a plasma ball mill under the protection of argon. The ball-milling medium is tungsten carbide balls, and the ball-to-material ratio is 20: 1. The ball milling time is 7h, the working current is 1.5A, and the excitation voltage is 15kV to obtain multi-layer flake carbonyl iron powder with an average particle size of less than 50μm.

[0036] figure 1 , figure 2 These are the low-magnification and high-magnification SEM images of the multi-layer carbonyl iron powder prepared in this example, respectively.

[0037] (2) The above-mentioned multi-layer flake carbonyl iron powder is refined by a planetary ball mill under the protection of argon. The ball milling speed is 350rpm. The ball milling medium is stainless steel balls. The time is 2 hours, and the secondary flaky carbonyl iron powder with a particle size of ...

Embodiment 2

[0039] The steps of this embodiment are basically the same as those of Embodiment 1, except that in step (2), the time for planetary ball milling is 4 hours. Figure 4 SEM image of the secondary flaky carbonyl iron powder prepared in this example. It can be seen from the figure that the particle size of the secondary flaky carbonyl iron powder is less than 15 μm. At the same time, it can be seen that, compared with Example 1, the particle size of the secondary flaky carbonyl iron powder obtained in this example is more uniform.

Embodiment 3

[0041] The steps of this embodiment are basically the same as those of Embodiment 1, except that in step (2), the time for planetary ball milling is 6h. Figure 5 SEM image of the secondary flaky carbonyl iron powder prepared in this example. It can be seen from the figure that the particle size of the secondary flaky carbonyl iron powder obtained by this process is less than 10 μm, and the particle size is relatively uniform.

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Abstract

The invention discloses a method of preparing sheet-like carbonyl iron powder with plasma assisted ball milling. The method includes the steps of: (1) under protection with inert gas, dry-milling carbonyl iron powder with average particle size being 5-200 [mu]m by a plasma assisted ball milling machine to produce multilayer sheet-like carbonyl iron powder being less than 100 [mu]m in particle size; and 2) dry-milling the multilayer sheet-like carbonyl iron powder through planetary ball milling to obtain secondary sheet-like carbonyl iron powder with average particle size being 2-50 [mu]m. The method is high in purity and activity of the product, has advantages in industrial promotion, achieves effective controllability of sheet size and has important significance in preparation of high-performance magnetic wave-absorbing materials.

Description

technical field [0001] The invention relates to a preparation method of a magnetic wave-absorbing material, in particular to a method for preparing flaky carbonyl iron powder by plasma-assisted ball milling. Background technique [0002] With the progress of national defense, the absorbing material has been greatly developed, and the magnetic absorbing material as its key component has also been studied more and more deeply. As a typical magnetic loss absorbing material, carbonyl iron absorber is one of the most commonly used radar absorbers. However, the carbonyl iron powder prepared by the traditional process often has an onion structure, and the magnetic permeability and magnetic loss of the particle-shaped carbonyl iron powder are affected by the Snoek relationship, resulting in a decrease in its absorbing performance. The wave-absorbing material with a sheet structure has the characteristics of high saturation magnetization and shape anisotropy, which can break through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16
CPCC01G49/16C01P2004/03C01P2004/61
Inventor 曾美琴宋凯强朱敏鲁忠臣胡仁宗陈可
Owner SOUTH CHINA UNIV OF TECH
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