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Gradient silicon steel and preparation method thereof

A silicon steel and gradient technology, applied in the field of gradient silicon steel and its preparation, can solve the problem that high silicon steel cannot be rolled, and achieve the effect of avoiding processing difficulties

Inactive Publication Date: 2017-11-10
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, the present invention adopts the molten salt electrochemical method to prepare a gradient layer on the low-silicon silicon steel substrate, and through the subsequent heat treatment process, a gradient silicon steel with a silicon content of 6.5% Si on the surface is obtained, and the interior is gradiently distributed, which solves the problem of brittleness of high-silicon steel Serious technical problems that cannot be rolled

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  • Gradient silicon steel and preparation method thereof
  • Gradient silicon steel and preparation method thereof
  • Gradient silicon steel and preparation method thereof

Examples

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Embodiment 1

[0026] A kind of gradient silicon steel of the present embodiment, its preparation method is specifically implemented according to the following steps:

[0027] Choose from NaCl, KCl, NaF and SiO 2 As raw material, prepare NaCl-KCl-NaF-SiO 2 For the molten salt system, first dry the above-mentioned raw materials in a DZF-6020 vacuum oven at 200°C for 12 hours, cool and grind them for later use; then grind NaCl, KCl and NaF into powders according to the molar ratio of 1:1: 2 to form a mixed powder, and then add SiO according to 2% of the mixed powder mass 2 , after mixing evenly, put the graphite crucible into the graphite crucible, put the crucible into the tubular resistance heating furnace and raise the temperature with the furnace, and pass in the flowing argon gas for protection. 2 The dissolution in the molten salt system can reach equilibrium, and NaCl-KCl-NaF-SiO can be obtained 2 molten salt system.

[0028] With the 1.2% Si low-silicon steel sheet as the cathode a...

Embodiment 2

[0034] This embodiment is a kind of gradient silicon steel, the specific steps of its preparation method are the same as in Example 1, the only difference is that the electrodeposition process is different, that is, during electrodeposition, the current density is 200mA cm -2 , the time is 60min, and the temperature is 800°C for electrodeposition.

Embodiment 3

[0036] This embodiment is a kind of gradient silicon steel. The specific steps of its preparation method are the same as in Example 1, the only difference is that the electrodeposition process is different, that is, during electrodeposition, the current density is 280mA cm -2 , the time is 60min, and the temperature is 800°C for electrodeposition.

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Abstract

The invention discloses a preparation method of gradient silicon steel, which belongs to the technical field of magnetic material preparation. The method is specifically: using NaCl, KCl, NaF and SiO2 as raw materials, mixing NaCl, KCl and NaF in a molar ratio of 1:1:2, and then adding SiO2 according to 2% of the mass of the mixed powder to prepare NaCl-KCl-NaF ‑SiO2 molten salt; 1.2% Si low-silicon steel sheet is used as the cathode and high-purity graphite sheet is used as the anode, which is placed in the above molten salt for electrodeposition; after the deposition, the cathode is placed in the annealing furnace for diffusion annealing. The present invention utilizes a cheap and stable molten salt system, adopts the molten salt electrochemical method to prepare alloy strips with a surface silicon content of 6.5%, and there is no pressure processing or other plastic deformation processes in the whole preparation process, fundamentally avoiding any Difficulty in processing due to low plasticity of 6.5% Si alloy strip.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a gradient silicon steel and a preparation method thereof. Background technique [0002] Fe-6.5% Si alloy strip has excellent performance as iron core material, but with the increase of silicon content, the room temperature brittleness of high silicon steel is serious, and it is very difficult to prepare by conventional rolling method. At present, there are few research reports on the preparation and production of high-silicon gradient silicon steel. Using 3.0wt% Si oriented silicon steel sheet as the substrate and template, a FeSi alloy film with a silicon content of 8.16wt% was prepared by cathodic ion plating technology, and vacuum annealing treatment was used to combine the high silicon film with the oriented silicon steel substrate to form a high silicon orientation gradient Silicon steel sheets are more closely bonded. However, the proces...

Claims

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Application Information

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IPC IPC(8): C25D5/50C25D3/66C25D5/36
CPCC25D5/50C25D3/66C25D5/36
Inventor 李慧梁精龙谢珊珊王蓝卿李运刚李兴
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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