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Method for preparing high-magnetic-property powder silicon steel sheet

A technology of powder silicon and performance is applied in the field of preparing high magnetic performance powder silicon steel sheet, which can solve the problems of unstable performance and low yield, and achieve the effects of excellent performance, no pollution and high production efficiency.

Active Publication Date: 2020-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1980s and 1990s, my country has done some research on adding a small amount of phosphorus to low-silicon steel. Although some achievements have been made, most of them are still in the stage of laboratory research. Low performance and unstable performance have not been promoted and used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0024] (1) Mix 20 μm electrolytic iron powder, 90 μm pure silicon powder and 15 μm Fe-25wt.% P ferrophosphorus powder according to the mass fraction of Fe-3wt.% Si-0.25wt.% P, and use a mixer Mix the above powder for 3h;

[0025] (2) Put the mixed powder into a plate-shaped silica gel mold, and perform cold isostatic pressing after fully vibrating. The pressure is controlled at 180MPa, and the pressure holding time is 60s. ×176mm×34mm (thick);

[0026] (3) Vacuum sinter the thick slab block at 1080°C for 3 hours to achieve metallurgical bonding and uniform element diffusion to obtain sintered slabs;

[0027] (4) After the above-mentioned sintered slab is heated to 860°C, hot rolling is carried out for 5 passes, after hot rolling to a slab thickness of 1.6 mm, 6 passes of warm rolling are carried out at 300° C. to a slab thickness of 0.45 mm;

[0028] (5) After fully pickling with 10% HCl aqueous solution, carry out 3 passes of cold rolling to a slab thickness of 0.24mm;

[...

Embodiment example 2

[0031] (1) Mix 30 μm electrolytic iron powder, 120 μm pure silicon powder and 8 μm Fe-40wt.% P ferrophosphorus powder according to the mass fraction of Fe-3.8wt.% Si-0.12wt.% P. machine to mix the above powder for 2.5h;

[0032] (2) Put the mixed powder into a plate-shaped silica gel mold, and perform cold isostatic pressing after fully vibrating. The pressure is controlled at 120MPa, and the holding time is 90s. ×189mm×42mm (thick);

[0033] (3) Vacuum sinter the thick slab blank at 1120°C for 3.5h to achieve metallurgical bonding and uniform element diffusion to obtain sintered slab;

[0034] (4) After heating the above-mentioned sintered slab to 820°C, carry out 7 passes of hot rolling, after hot rolling to a slab thickness of 2.0mm, carry out 5 passes of warm rolling at 340°C to a slab thickness of 0.48mm;

[0035] (5) After fully pickling with 10% HCl aqueous solution, carry out 4 passes of cold rolling to a slab thickness of 0.22mm;

[0036] (6) Vacuum anneal the cold...

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Abstract

The invention discloses a method for preparing a high-magnetic-property powder silicon steel sheet, and belongs to the field of powder metallurgy. According to the method, electrolytic iron powder, pure silicon powder and ferrophosphorus alloy powder are evenly mixed according to Fe-(3-4) wt.% Si -(0.05-0.3) wt.% P, a thick plate blank is formed through isostatic cool pressing, multi-pass hot rolling is carried out after metallurgical bonding of the thick plate blank is achieved through sintering, cold rolling is carried out for 2-4 times, and finally heat treatment is carried out to obtain the silicon steel sheet with excellent performance. Compared with low-silicon steel, a small amount of P element is added into the silicon steel, so that the resistivity can be effectively improved, andthe iron loss is greatly reduced; compared with high-silicon steel, the Si content is greatly reduced, the iron loss can be slightly increased by slightly increasing the P content, meanwhile, the saturation magnetization intensity is improved, and the formability and the subsequent hot working performance of a powder system are obviously improved; in addition, the P element is added, activated sintering can be promoted, the sintering temperature is remarkably reduced, and the plate blank brittleness is reduced; and the method has the advantages of simple steps, high preparation efficiency, high product precision, no pollution and inclusion, excellent magnetic performance and the like.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to a method for preparing high-magnetic powder silicon steel sheets. Background technique [0002] Silicon steel is an important magnetic material used in electric power, electronics and telecommunications industries to manufacture generators, motors, transformers, relays, transformers and other electrical instruments, and is one of the most productive metal functional materials. The performance of silicon steel is superior to that of iron. It has the advantages of high resistivity (several times that of electrical pure iron), low eddy current loss, high saturation magnetic induction, cheap price and good stability, and is easy to mass produce. It is currently the most widely used soft magnetic material. With the increase of silicon content in the silicon steel sheet, the resistivity and magnetic permeability can be increased, the coercivity and magnetostriction coefficient can be red...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C33/02C21D8/12
CPCC21D8/1222C21D8/1227C21D8/1233C21D8/1244C22C33/0271C22C38/002C22C38/02
Inventor 杨芳秦乾陈明训郭志猛陈存广邵艳茹魏家树李沛汪豪杰
Owner UNIV OF SCI & TECH BEIJING
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