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Method for preparing Fe-6.5Wt%Si magnetically soft steel sheet

A fe-6.5wt%si, soft magnetic technology, which is applied in the preparation of soft magnetic plate materials and the preparation of Fe-6.5Wt%Si soft magnetic steel sheets, can solve the problems affecting the surface quality and magnetic properties of materials, CVD system Pipe condensation, grain growth and other problems, to avoid processing difficulties, easy to obtain, less consumption

Inactive Publication Date: 2008-02-13
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] This method is easy to cause abnormal grain growth and affect the surface quality and magnetic properties of the material.
And the generated FeCl 2 It is easy to condense in the CVD system pipeline and corrode the equipment
Therefore, the law is still in the research stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh the molten salt as the medium according to the molar ratio of NaCl:KCl:NaF of 1:1:3, powdered SiO2 The addition amount accounts for 8% of the mass percentage of molten salt medium. Mix the above four substances, put them into a crucible, put them into an electric furnace and raise the temperature to 750°C, hold the temperature for 10 minutes, put in a Fe-3.5% Si non-oriented silicon steel sheet or a oriented silicon steel sheet cathode with a thickness of 0.5mm, and pulse the electricity And the average current density is 600A·cm -2 Under the conditions, after 52min of deposition, the silicon steel sheet cathode is taken out, and the homogenization diffusion annealing process is carried out. The processing conditions are: temperature 1050° C.; argon protection; time 140 min; sample cooling rate 10° C. / min to obtain Fe-6.5% Si thin plate. The analysis of the Si content distribution, microstructure and surface morphology of the cross-section of the sample shows tha...

Embodiment 2

[0027] Weigh the molten salt as the medium according to the molar ratio of NaCl:KCl:NaF of 1:1:3, powdered SiO 2 The addition amount accounts for 11% of the mass percentage of molten salt medium. Mix the above four substances, put them into a crucible, put them into an electric furnace and raise the temperature to 800°C, keep the temperature constant for 15 minutes, put in a Fe-3.5% Si non-oriented silicon steel sheet or oriented silicon steel sheet cathode with a thickness of 0.5mm, and pulse power And the average current density is 700A cm -2 Under the conditions, after 48min of deposition, the cathode of the silicon steel sheet is taken out, and the homogenization diffusion annealing process is carried out. The processing conditions are as follows: temperature 1100°C; argon protection; time 130min; sample cooling rate 15°C / min to obtain Fe-6.5% Si thin plate. The analysis of the Si content distribution, microstructure and surface morphology of the cross-section of the sam...

Embodiment 3

[0029] Weigh the molten salt as the medium according to the molar ratio of NaCl:KCl:NaF of 1:1:3, powdered SiO 2 The addition amount accounts for 15% of the mass percentage of molten salt medium. Mix the above four substances, put them into a crucible, put them in an electric furnace and raise the temperature to 900°C, hold the temperature for 18 minutes, put in a Fe-3.5% Si non-oriented silicon steel sheet cathode with a thickness of 0.5mm, pulse power and the average current density 850A·cm -2 Under the condition of , after 40 minutes of deposition, take out the non-oriented silicon steel sheet cathode, and carry out the homogenization diffusion annealing process. The treatment conditions are: temperature 1150°C; argon protection; time 120min; sample cooling rate 20°C / min to obtain Fe-6.5% Si thin plate. The analysis of the Si content distribution, microstructure and surface morphology of the cross-section of the sample shows that the Si content of the obtained non-oriente...

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Abstract

A method of preparing an Fe-6.5 weight percent Si soft magnetic steel sheet belongs to the technical field of metallurgy materials, and is used to solve the problem of technical difficulty of current methods in preparing Fe-6.5 weight percent Si soft magnetic steel sheets. The method consists of procedures of a silicon steel sheet with less than 3.5percent Si as the matrix, siliconizing by molten salt preparation and electric deposition on the silicon steel sheet, even diffusion and annealing, etc. The method of the invention is essentially characterized in that: (1) the whole preparation process does not include pressure processing or other plastic deformation processes, which can thoroughly prevent any processing difficulty produced by low plasticity of the Fe-6.5percent Si. (2)the deposition speed and diffusion speed of the Si can be basically equal by regulating the current density and temperature parameters of deposition, so as to prevent a large amount of silicide on the surface. (3) the influence on the original structure of the matrix is small. (4) the medical preparation used in the method is low in cost, easily available and little consumable.

Description

technical field [0001] The invention relates to a method for preparing a soft magnetic plate material, in particular to a method for preparing a Fe-6.5wt% Si soft magnetic steel sheet, belonging to the technical field of metallurgical materials. Background technique [0002] Silicon steel refers to electrical steel with very low carbon content and 0.5-6.5% silicon content. It is mainly used as iron cores of various motors and transformers, ballasts in fluorescent lamps, magnetic switches and relays, magnetic shields, transformers and other electrical appliances. Instruments, etc., are indispensable soft magnetic materials in electric power, electronics, and military industries, and are an important metal functional material. [0003] Various losses will occur during the transmission and use of electricity, and the losses caused by electrical steel in ballasts, motors and transformers are called iron losses. According to relevant reports, the iron loss in my country accounts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C25D3/66C23C10/24
Inventor 李运刚梁精龙蔡宗英李魁猛李慧
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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