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A method for improving high-temperature and high-salt properties of iron powder by using plasma electrolysis

A plasma electrolysis, high temperature and high salt technology, applied in electrolytic inorganic material coating, metal processing equipment, transportation and packaging, etc. It is easy to completely and uniformly coat problems, and achieve the effect of simplifying the powder modification process, improving the high temperature and high salt performance of iron powder, and reducing the cost.

Active Publication Date: 2020-10-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the carbonization method needs to disperse the iron powder in an aqueous emulsion and then carbonize it, it has high requirements on the process conditions, and it is not easy to achieve complete and uniform coating; the materials required for the electroless plating method and the organic coating method often have certain environmental pollution. Among them, the plating solution used in the electroless plating method is prone to self-decomposition, which increases the difficulty of operation and the combination of the coating and the substrate is not firm; the sol-gel method, because the iron powder is coated with gel and then dried, the uniformity and combination of coating thickness The strength often cannot meet the requirements, so there are certain deficiencies

Method used

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  • A method for improving high-temperature and high-salt properties of iron powder by using plasma electrolysis
  • A method for improving high-temperature and high-salt properties of iron powder by using plasma electrolysis

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Experimental program
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Effect test

Embodiment 1

[0028] (1) The liquid feed port 2 at the upper end of the mixing vessel is connected with the source of the electrolytic solution, and the solid feed port 1 at the upper end of the mixing vessel is connected with the source of iron powder; wherein the source of the electrolytic solution is 10L of Na with a concentration of 30g / L 2 SiO 3 Aqueous solution, the source of iron powder is 500g of carbonyl iron powder with a particle size of 10 μm;

[0029] (2) The negative electrode 5 and the positive electrode 4 are symmetrically installed on the side wall of the discharge port 6 at the lower end of the mixing container, and the end faces of the negative electrode 5 and the positive electrode 4 are respectively connected to the inner surface of the side wall of the corresponding discharge port 6 flush, the cathode electrode 5 and the anode electrode 4 are respectively connected to a high-frequency DC power supply; wherein, the cathode electrode is a titanium alloy rod with a diamet...

Embodiment 2

[0034] (1) The liquid feed port 2 at the upper end of the mixing vessel is connected with the source of the electrolytic solution, and the solid feed port 1 at the upper end of the mixing vessel is connected with the source of iron powder; wherein the source of the electrolytic solution is 10L of Na with a concentration of 50g / L 2 SiO 3 Aqueous solution, iron powder source is 3000g flake iron powder with a particle size of 30μm;

[0035] (2) The negative electrode 5 and the positive electrode 4 are symmetrically installed on the side wall of the discharge port 6 at the lower end of the mixing container, and the end faces of the negative electrode 5 and the positive electrode 4 are respectively connected to the inner surface of the side wall of the corresponding discharge port 6 The cathode electrode 5 and the anode electrode 4 are respectively connected to a high-frequency DC power supply; among them, the cathode electrode is selected from a M6 titanium alloy rod with a diamet...

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Abstract

The invention relates to a method for improving the high-temperature and high-salt properties of iron powder by using plasma electrolysis, and belongs to the technical field of iron powder surface modification. The method adopts the method of transporting the iron powder and the electrolyte solution separately, so that the iron powder and the electrolyte solution are mixed and immediately processed by the electrolytic plasma arc area, so as to avoid the problem of iron powder sedimentation or floating in the one-time preparation of the mixed suspension, and adopt a small The continuous batch processing method ensures the comprehensive quality of the iron powder modification treatment, and at the same time reduces the discharge area of ​​the cathode electrode, which is conducive to reducing costs and improving safety factors. The method of the invention has the advantages of simple operation, high production efficiency and low cost, and can ensure the improvement of the high-temperature and high-salt properties of the iron powder, and has good application prospects.

Description

technical field [0001] The invention relates to a method for improving the high-temperature and high-salt properties of iron powder by using plasma electrolysis, and belongs to the technical field of iron powder surface modification. Background technique [0002] Electronic equipment will inevitably radiate electromagnetic waves during operation. In some specific environments, it is necessary to artificially introduce some external structural materials to reduce or even absorb electromagnetic waves to achieve the purpose of protecting electronic equipment. Therefore, research on microwave absorbing materials is particularly important. . [0003] As a metal micropowder absorbent, iron powder has become an important magnetic wave-absorbing material due to its high magnetic permeability and magnetization. The purpose of reducing or even absorbing electromagnetic waves. However, at high temperature, the large specific surface area provides more activated attachment points for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C25D9/04
CPCC25D9/04B22F1/16
Inventor 陈为为张永福卜爱明向艳杨赟杰程焕武王鲁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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