Method for preparing high silicon steel thin plate through gas power spraying

A technology of gas dynamic spraying and high-silicon steel, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of high preparation cost, low deposition rate, complex equipment structure, etc., and achieve fast film forming speed, high deposition rate and simple equipment Effect

Inactive Publication Date: 2017-11-10
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since both magnetron sputtering technology and multi-arc ion plating technology need to be implemented in a vacuum environment, the equipment structure is complex and the deposition rate is low, and the preparation cost is high.

Method used

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  • Method for preparing high silicon steel thin plate through gas power spraying
  • Method for preparing high silicon steel thin plate through gas power spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: A method for preparing Fe-5.5~6.5wt.%Si high-silicon steel sheet by gas dynamic spraying, the steps of preparation by single-sided spraying are:

[0057] Step 1. Select a low-silicon steel sheet with a thickness of 0.15mm and a Si content of 2wt.% as the substrate, and perform the following pretreatment:

[0058] (1) Wash with sodium hydroxide solution with a concentration of 10% and a temperature of 80° C. for 5 minutes to remove oil stains on the surface of the substrate;

[0059] (2) Wash with 4% dilute hydrochloric acid for 5 minutes to remove rust and scale on the surface of the substrate;

[0060] (3) rinse with water;

[0061] (4) Ultrasonic cleaning with anhydrous ethanol, drying for later use;

[0062] Step 2. Spray powder preparation

[0063] (1) mix metal silicon with purity ≥ 99.9% and high-purity iron with purity ≥ 99.9% in a weight ratio of 40:60, wherein the metal silicon is 40;

[0064] (2) Place the ingredients in a vacuum induction me...

Embodiment 2

[0074] Embodiment 2: A method for preparing Fe-5.5~6.5wt.%Si high-silicon steel sheet by gas dynamic spraying, the steps of double-sided spraying preparation are:

[0075] Step 1. Select a low-silicon steel sheet with a thickness of 0.35mm and a Si content of 3wt.% as the substrate, and perform the following pretreatment:

[0076] (1) Wash with sodium hydroxide solution with a concentration of 12% and a temperature of 60° C. for 5 minutes to remove oil stains on the surface of the substrate;

[0077] (2) Wash with 4% dilute hydrochloric acid for 3 minutes to remove rust and scale on the surface of the substrate;

[0078] (3) rinse with water;

[0079] (4) Ultrasonic cleaning with anhydrous ethanol, drying for later use;

[0080] Step 2. Spray powder preparation

[0081] (1) Mix metal silicon with a purity of ≥99.9% and high-purity iron with a purity of ≥99.9% in a weight ratio of 25:75, wherein the metal silicon is 25;

[0082] (2) Place the ingredients in a vacuum inducti...

Embodiment 3

[0092] Example 3 Preparation of Fe-6.5wt.% Si high-silicon steel by spraying high-Si coating on one side of low-silicon steel substrate

[0093] Step 1: Select low-silicon steel substrate

[0094] Select a 200mm×200mm, 0.35mm thick, low-silicon steel sheet with a Si content of 3wt.% as the substrate, first wash it with a sodium hydroxide solution with a concentration of 10% and a temperature of 80°C for 5 minutes to remove oil stains; then use dilute hydrochloric acid with a concentration of 4% Wash for 5 minutes to remove rust and oxide skin, etc.; then rinse with water, ultrasonically clean with absolute ethanol, and dry for later use;

[0095] Step 2. Spray powder preparation

[0096] (1) 2000 grams of metal silicon with a purity of ≥99.9% and high-purity iron with a purity of ≥99.9% are prepared in a weight ratio of 33:67;

[0097] (2) Place the ingredients in a vacuum induction melting furnace, and vacuumize to make the background vacuum in the furnace reach 10 -4 Pa l...

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Abstract

The invention relates to a method for preparing a Fe-Si alloy thin plate, in particular to a method for preparing Fe-5.5wt.%-6.5wt.%Si high silicon steel thin plate with excellent soft magnetic properties through the gas power spraying (cold spraying) technology. According to the method for preparing the high silicon steel thin plate through gas power spraying, gas power spraying is adopted for spraying micron-order Fe-23wt.%-40wt.%Si alloy micro powder on one face or double faces of a low-silicon steel thin plate, then high temperature diffusion treatment is carried out in a hydrogen gas reduction atmosphere, Si atoms in an Si coating are inwards diffused to permeate into a low-silicon steel base until the Si content in the base reaches 5.5wt.%-6.5wt.%, the high silicon steel thin plate with the excellent soft magnetic properties is obtained, and the using requirement of high-performance iron core materials is met. According to the method, the coating preparation rate is high, the working efficiency is high, the quality in the preparing process is controllable, and therefore the method is particularly suitable for industrial application.

Description

technical field [0001] The invention relates to a method for preparing Fe-Si thin plate, more particularly, refers to a method for preparing high-performance Fe-5.5-6.5wt.%Si high-silicon steel thin plate by using gas dynamic spraying technology. Background technique [0002] At present, the Fe-6.5wt% Si thin plate is basically prepared by chemical vapor deposition and rolling in the world. The chemical vapor deposition method is to introduce silane gas in a vacuum chamber, decompose the silane gas by heating, and deposit a certain amount of silicon on the silicon steel plate that has been properly pretreated; and then obtain a uniform Fe-6.5wt% by heat treatment. Si sheet. The rolling method is to directly perform hot and cold rolling on the Fe-6.5wt% Si ingot for multiple times to obtain a thin plate with a required thickness. Due to the brittleness of Fe-6.5wt% Si itself and the limitations of the rolling process, the thickness of the Fe-6.5wt% Si sheet prepared by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 田广科任杰王倩
Owner LANZHOU JIAOTONG UNIV
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