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Powder extrusion preparing method of Fe-Si mixed soft magnetic material thin strip with 6.5% of Si

A fe-6.5%si, soft magnetic material technology, applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of difficult forming of thin alloy strips

Inactive Publication Date: 2018-04-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention provides a method for preparing Fe-6.5% Si soft magnetic material thin strips by powder extrusion. Aiming at the problem that Fe-Si alloy thin strips with 4.5-6.7% Si content are difficult to form, water atomized Fe powder and High-purity ferrosilicon powder with a Si content of 70-80% is used as a raw material. 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 method. Using the large deformation effect of hot extrusion The density of the extruded billet is increased, the structure is refined, and partial alloying is realized 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 of Fe-Si mixed soft magnetic material thin strip with 6.5% of Si
  • Powder extrusion preparing method of Fe-Si mixed soft magnetic material thin strip with 6.5% of Si
  • Powder extrusion preparing method of Fe-Si mixed soft magnetic material thin strip with 6.5% of Si

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix -100 mesh water atomized Fe powder with Fe-80% Si high-purity powder with particle size ≤ 10 μm according to the ratio of 91.625:8.375 to form Fe-6.7% Si mixed powder. 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 green density obtained is 6.37g / 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 ...

Embodiment 2

[0055] Mix -100 mesh water atomized Fe powder with Fe-70% Si high-purity powder with a particle size of ≤10 μm in a ratio of 93.57:6.42 to form Fe-4.5% Si mixed powder. 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 6.54g / 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...

Embodiment 3

[0062] Mix -100 mesh water atomized Fe powder with Fe-76% Si high-purity powder with a particle size of ≤10 μm in a ratio of 91.45:8.55 to form Fe-6.5% Si mixed powder. 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 6.40g / 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 extru...

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Abstract

Provided is a powder extrusion preparing method of an Fe-Si mixed soft magnetic material thin strip with 6.5% of Si. Nearly spherical water atomization Fe powder and high purity silicon iron powder with 70%-80% of superfine Si are adopted to form Fe-Si mixed powder with 4.5-6.7% of Si; the mixed powder is subjected to mold pressing to form a square blank and then heated to 950 DEG C-1050 DEG C toachieve Fe phase austenitizing, and a slab is formed by deformation thermal extrusion with the extrusion ratio of 8-16; then the powder rolling slab is sintered in vacuum or reduction atmosphere protection at the temperature range of 1070 DEG C-1170 DEG C; through multiple times of cold rolling and low temperature diffusion sintering, homogeneous alloying of high silicon steel is realized by vacuum or reduction atmosphere protection sintering at a temperature range from 1275 DEG C to 1335 DEG C; and the high silicon steel strip with the thickness of 0.1mm-0.5mm, the Si content of 4.5%-6.7% andthe density of 7.39 g / cm3 or above is 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): B22F3/20B22F3/18B22F1/00C22C33/02B22F3/10C22C38/02H01F41/02H01F1/147
CPCB22F1/0003H01F1/14775H01F41/02C22C33/0207C22C38/02B22F3/10B22F3/1007B22F3/18B22F3/20B22F2998/10B22F2003/208B22F1/10
Inventor 罗丰华杨昊廖相巍李益民蔺瑞冬
Owner CENT SOUTH UNIV
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