Method for preparing high-silicon steel sheet by powder compression sintering

A high-silicon steel and powder technology, applied in the field of powder metallurgy, can solve the problems of difficult powder forming, process complexity, residual carbon, etc., and achieve the effects of high production efficiency, short process flow and simple operation

Active Publication Date: 2020-02-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention innovatively proposes the method of pressing and firing the gas-atomized alloy powder, which directly overcomes the problem that the spherical gas-atomized powder is difficult to form, thereby avoiding the complexity of the process and the subsequent degumming and carbon residue caused by the addition of organic forming agents And other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] (1) Weigh 100 g of gas-atomized Fe-6.5wt.% Si powder of -200 mesh;

[0029] (2) Place the aerosolized powder in the two-layer ceramic plate and compact it evenly, the compacted thickness is about 2mm, and evenly press 2kg of high-melting-point heavy objects on the upper ceramic plate to obtain the whole preset powder;

[0030] (3) Vacuum sinter the whole preset powder at 1200°C for 2 hours to achieve metallurgical bonding and element diffusion homogenization. After cooling, remove the upper and lower ceramic plates of the sintered slab and the high melting point heavy objects above to obtain the sintered slab. Density 6.89g / cm 3 ;

[0031] (4) After heating the sintered slab to 940°C, hot rolling is carried out 4 times until the thickness of the slab is 0.54mm;

[0032] (5) Cold rolling: After pickling to fully remove the scale, directly carry out 2 times of cold rolling to a slab thickness of 0.27mm;

[0033] (6) High-temperature vacuum annealing: the cold-rolled sl...

Embodiment example 2

[0035] (1) Weigh 240g of gas-atomized Fe-6.5wt.% Si powder of -200 mesh;

[0036] (2) Place the aerosolized powder in the two-layer ceramic plate and compact it evenly, the compacted thickness is about 4mm, and evenly press 4kg of high-melting point heavy objects on the upper ceramic plate to obtain the whole preset powder;

[0037] (3) Vacuum sinter the whole pre-set powder at 1300°C for 1.5h to achieve metallurgical bonding and element diffusion uniformity. After cooling, remove the ceramic plates above and below the sintered slab and the high melting point heavy objects above to obtain the sintered slab. The density is 7.03g / cm 3 ;

[0038] (4) After heating the sintered slab to 890°C, hot rolling is carried out 7 times until the thickness of the slab is 0.48mm;

[0039] (5) Cold rolling: After pickling to fully remove the scale, cold rolling is directly carried out 3 times until the thickness of the slab is 0.23mm;

[0040] (6) High-temperature vacuum annealing: vacuum ...

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Abstract

The invention discloses a method for preparing a high-silicon steel sheet by powder compression sintering, and belongs to the technical field of powder metallurgy. According to the method, gas atomized Fe-6.5 wt.% Si powder is used as a raw material, the powder is in a compact state through powder presetting, the powder is placed in a vacuum sintering furnace to be metallurgically bonded through high-temperature sintering, multi-passes hot rolling are carried out to a certain thickness and then 1-4 times of cold rolling are carried out, and finally annealing is carried out at high temperatureto obtain the high-silicon steel sheet with excellent performance. Compared with adopting water atomized powder, gas atomized high-silicon steel powder is adopted and oxide inclusions of an alloy system are greatly reduced, meanwhile, the problem that spherical gas atomized powder is difficult to form is solved by adopting a direct compression sintering method, so that the process complexity and the subsequent problems of degumming and carbon residue caused by adding a forming agent are avoided, and the method has the advantages of being simple to operate, high in production efficiency, high in product precision, short in process flow, free of pollution and inclusions, excellent in performance and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a method for preparing high-silicon steel flakes through powder pressing and firing. Background technique [0002] The development of traditional soft magnetic materials has gone through the process from pure iron, silicon steel, permalloy to soft ferrite. New soft magnetic materials mainly include amorphous alloys (also known as metallic glass), nanocrystalline (ultracrystalline) soft magnetic alloys, soft magnetic composite materials, etc., all of which are manufactured by powder metallurgy technology. New soft magnetic materials have excellent magnetic properties but also have many limiting factors, such as low material strength and poor device stability. Therefore, silicon steel is still an important magnetic material used in the electric, electronic and telecommunications industries to manufacture generators, motors, transformers, relays, transformers and other elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/10B22F3/18B22F3/24C22C38/02
CPCB22F3/02B22F3/1007B22F3/18B22F3/24B22F2003/248C22C38/02
Inventor 杨芳秦乾陈明训郭志猛陈存广路新邵艳茹孙海霞汪豪杰
Owner UNIV OF SCI & TECH BEIJING
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