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Powder rolling method for preparing Fe-6.5%Si soft magnetic material thin strip

A fe-6.5%si, soft magnetic material technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of unsatisfactory scale and output, complex process, unable to meet environmental protection requirements, etc.

Inactive Publication Date: 2018-05-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has been used to achieve small-scale industrial production, its scale and output are far from meeting the needs of the international soft magnetic material market, and this preparation method is very complicated in process, high in energy consumption and cost, and the working environment is not good. It is harsh and cannot meet environmental protection requirements

Method used

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  • Powder rolling method for preparing Fe-6.5%Si soft magnetic material thin strip
  • Powder rolling method for preparing Fe-6.5%Si soft magnetic material thin strip
  • Powder rolling method for preparing Fe-6.5%Si soft magnetic material thin strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Mix -100 mesh water atomized Fe powder with elemental Si powder with a particle size ≤ 3 μm at a ratio of 93.3:6.7 to form a mixed powder of Fe-6.7% Si. When mixing, add 0.6% paraffin micropowder and 0.1% engine oil of the total amount of raw materials. Dehydrated alcohol is added according to the amount of 200ml / ton. The above powders were mixed for 4 h using a V-shaped blender.

[0047] Using a two-roller horizontal rolling mill and an inclined feeding trough, using the powder self-weight and the friction between the roll and the powder to feed, a 2.5mm powder rolling slab is rolled out, and the width of the slab is 100mm. The density of the compact is 5.95g / cm 3 .

[0048] The powder compact is placed on a molybdenum plate coated with MgO micropowder, and placed in a vacuum degreasing and sintering furnace. Adopt a heating rate of 2°C / min, and keep warm at 200°C and 400°C for 4 hours respectively. Then heat up to 1075°C for 4 hours for sintering. The density of...

Embodiment 2

[0052] Mix -100 mesh water atomized Fe powder with elemental Si powder with a particle size of ≤3 μm at a ratio of 95.5:4.5 to form a mixed powder of Fe-4.5% Si. When mixing, add 0.7% zinc stearate and 0.1% machine oil of the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton. The above powders were mixed for 6 h using a drum mixer.

[0053] Using a two-roller horizontal rolling mill and an inclined feeding trough, using the powder self-weight and the friction between the roll and the powder to feed, a 1.0mm powder rolling slab is rolled out, and the width of the slab is 240mm. The density of the compact is 6.45g / cm 3 .

[0054] The powder compact is placed on a molybdenum plate coated with MgO micropowder, and placed in a vacuum degreasing and sintering furnace. Adopt a heating rate of 5°C / min, and keep warm at 200°C and 400°C for 2h respectively. Then heat up to 1175°C for sintering with heat preservation for 2h. The density...

Embodiment 3

[0058] Mix -100 mesh water atomized Fe powder with elemental Si powder with a particle size ≤ 3 μm in a ratio of 93.5:6.5 to form a mixed powder of Fe-6.5% Si. When mixing, add 0.4% paraffin micropowder, 0.2% methylcellulose, and 0.1% motor oil in the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton. The above powders were mixed for 6 h using a drum mixer.

[0059] Using a two-roller horizontal rolling mill and an inclined feeding trough, using the powder self-weight and the friction between the roll and the powder to feed, a 1.6mm powder rolling slab is rolled out, and the width of the slab is 180mm. The density of the compact is 6.05g / cm 3 .

[0060] The powder slab is placed on a corundum plate coated with MgO micropowder, and placed in a hydrogen tube furnace for degreasing and sintering. A heating rate of 3°C / min was adopted, and the temperature was kept at 200°C for 2h and at 400°C for 3h. Then heat up to 1150°C for 3 h...

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Abstract

The invention provides a powder rolling method for preparing a Fe-6.5%Si soft magnetic material thin strip. The powder rolling method for the preparing the Fe-6.5%Si soft magnetic material thin stripuses water atomized Fe powder and fine Si powder as raw materials to form Fe-4.5-6.7%Si mixed powder. The porous slab is formed by the powder rolling, and the porous slab is sintered protectively in vacuum or reduction atmosphere at 1075-1175 DEG C, so that the particles of Fe powder are not fully connected. Si and Fe are partially alloyed to form a porous and compressible high silicon steel billet with incomplete alloying. Then Cold rolling and incomplete sintering are carried out many times. Finally, the protective sintering is carried out in vacuum or reduction atmosphere at 1275-1345 DEG C, the homogeneous alloying of the high silicon steel is realized with the help of thermal diffusion, and a high silicon steel strip containing 4.5-6.7% of Si is obtained. The thickness of the high silicon steel strip is 0.1-0.5mm, and the density of the high silicon steel strip is 7.32-7.47g / cm3.

Description

technical field [0001] The invention belongs to the field of preparation and processing of metal materials, and in particular relates to methods for powder metallurgy sintering and rolling deformation of Fe-6.5% Si steel strips. technical background [0002] The remanence and coercivity of soft magnetic materials are very small, that is, the hysteresis loop is very narrow, which almost coincides with the basic magnetization curve, and is mainly used in the cores of inductance coils, transformers, relays and motors. The maximum magnetic permeability of Fe-Si alloy changes with Si content, and two peaks of maximum magnetic permeability appear around 2% and 6.5% of Si mass percentage (the same below), reaching 10000 and 25000 respectively. The maximum magnetic permeability of Fe-Si alloy has no absolute advantage in soft magnetic materials. For example, the maximum magnetic permeability of permalloy can reach 200,000. However, the production cost of Fe-Si alloy sheet with Si&l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/18B22F3/10B22F1/00C22C33/02C22C38/02
CPCB22F1/0003C22C33/0278C22C38/02B22F3/1007B22F3/1021B22F3/18B22F2998/10B22F1/10
Inventor 罗丰华杜帅王铸博白云波李益民
Owner CENT SOUTH UNIV