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Powder extrusion preparing method for Fe-6.5% Si soft magnetic material thin strips

A fe-6.5%si, soft magnetic material technology, used in metal processing equipment, transportation and packaging, etc., can solve problems such as difficulty in forming

Inactive Publication Date: 2018-05-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The invention provides a powder extrusion preparation method of Fe-6.5% Si soft magnetic material thin strip, aiming at the problem that Fe-Si alloy thin strip with 4.5-6.7% Si content is difficult to form, water atomized Fe powder and The fine elemental Si powder is evenly mixed, and after adding a forming agent, it is molded into an extruded green body, and then a slab of a certain thickness is prepared by powder hot extrusion, and the density of the extruded billet is increased and the microstructure is improved by using the large deformation effect of hot extrusion. Refinement, and achieve partial alloying under the action of thermal diffusion, forming a multi-phase structure of Si-poor α-Fe grains with plastic deformation ability and brittle high Si phase

Method used

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  • Powder extrusion preparing method for Fe-6.5% Si soft magnetic material thin strips
  • Powder extrusion preparing method for Fe-6.5% Si soft magnetic material thin strips
  • Powder extrusion preparing method for Fe-6.5% Si soft magnetic material thin strips

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 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.

[0049] A square compact was prepared by compression molding. The length and width of the compact were 120 mm and 80 mm, respectively, and the height was 40 mm. It was pressed with a surface pressure of 600 MPa, and the total output pressure of the press was 576 tons. The obtained compact density is 6.33g / cm 3 .

[0050] A square extrusion cylinder of 40×120mm is used, and the extrusion dies are 5×120mm respectively, corresponding to an extrusion ratio of 8. Before extrusion, the molded billet was heated to 950°C under the protection of nitrogen and kept for 4 hours. The extrusion barrel ...

Embodiment 2

[0055] 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.

[0056] A square compact was prepared by compression molding. The length and width of the compact were 120 mm and 80 mm, respectively, and the height was 40 mm. It was pressed with a surface pressure of 600 MPa, and the total output pressure of the press was 576 tons. The obtained compact density is 6.50g / cm 3 .

[0057] A square extrusion cylinder of 40×120mm is adopted, the extrusion die is 2.5×120mm, and the corresponding extrusion ratio is 16. Before extrusion, the molded billet was heated to 1050°C under the protection of nitrogen and kept for 2 hours. The extrusion barrel and extrusion die we...

Embodiment 3

[0062] 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.

[0063] A square compact was prepared by compression molding. The length and width of the compact were 120 mm and 80 mm, respectively, and the height was 40 mm. It was pressed with a surface pressure of 600 MPa, and the total output pressure of the press was 576 tons. The obtained compact density is 6.36g / cm 3 .

[0064] A square extrusion cylinder of 40×120mm is adopted, the extrusion die is 4×120mm, and the corresponding extrusion ratio is 10. Before extrusion, the molded billet was heated to 1000°C under the protection of nitrogen and kept for 3 hours. The extrusion bar...

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Abstract

The invention provides a powder extrusion preparing method for Fe-6.5% Si soft magnetic material thin strips. Near-spherical water atomized Fe powder and fine Si powder are adopted as raw materials, Fe-4.5-6.7% Si mixed powder is formed, and a square blank is formed through die pressing; heating is conducted to 950-1,050 DEG C, and Fe phase austenitizing is achieved; a slab is formed through hot extrusion with the deformation extrusion ratio being 8-16; then, the extruded slab is subjected to vacuum or reducing atmosphere protective sintering within the temperature range from 1,080 DEG C to 1,180 DEG C; and multi-time cold rolling and low-temperature diffusion sintering are conducted later, vacuum or reducing atmosphere protective sintering is finally conducted within the temperature rangefrom 1,280 DEG C to 1,350 DEG C, high-silicon steel homogeneous alloying is achieved, and the high-silicon steel strips in which the content of Si ranges from 4.5% to 6.7%, the thickness ranges from0.1 mm to 0.5 mm, and the density is larger than or equal to 7.38 g / cm<3> are obtained.

Description

technical field [0001] The invention belongs to the field of preparation and processing of metal materials, in particular to methods for powder metallurgy sintering, hot extrusion and rolling deformation of high silicon steel thin 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/20B22F3/18B22F3/10C22C38/02C22C33/02
CPCC22C33/02C22C38/02B22F3/1007B22F3/18B22F3/20B22F2003/208B22F2999/00B22F2998/10B22F1/10B22F2201/20B22F2201/01B22F2201/10B22F3/02
Inventor 罗丰华王宸李益民白云波张立
Owner CENT SOUTH UNIV
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