Method for preparing high silicon steel thin strip by powder extrusion

A high-silicon steel, manufacturing method technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of harsh operating environment, unsatisfactory scale and output, high energy consumption and cost

Inactive Publication Date: 2018-04-13
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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  • Method for preparing high silicon steel thin strip by powder extrusion
  • Method for preparing high silicon steel thin strip by powder extrusion
  • Method for preparing high silicon steel thin strip by powder extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix -100 mesh reduced Fe powder with Fe-70% Si high-purity powder with a particle size of ≤6 μm in a ratio of 90.43:9.57 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 obtained compact density is 6.39g / 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 reduced Fe powder with Fe-50% Si high-purity powder with a particle size of ≤10 μm in a ratio of 91:9 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 tumble 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 green density obtained is 6.56g / 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 were pre...

Embodiment 3

[0062] Mix -100 mesh reduced Fe powder with Fe-60% Si high-purity powder with a particle size of ≤6 μm at a ratio of 89.17:10.83 to form Fe-6.5% Si mixed powder. When mixing, add 0.4% paraffin micropowder, 0.2% methylcellulose, and 0.1% machine 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 6.42g / 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 ...

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Abstract

The invention discloses a method for preparing a high silicon steel thin strip by powder extrusion. Reduced Fe powder and 50-70% of high-purity silicon iron powder are used as raw materials to form Fe-Si mixed powder with the Si content being 4.5-6.7%. The mixed powder is subjected to mold-pressing to form a square billet which is then heated to 950-1050 DEG C to achieve Fe phase austenitizing, and the square billet is hot-extruded into a slab with the deformation amount under the extrusion ratio of 8-16. The extruded slab is then subjected to vacuum or reducing atmosphere protective sinteringin a temperature range of 1060-1160 DEG C, so that Fe powder particles are metallurgically bonded, Si and Fe are partially alloyed, and dense poor-Si alpha-Fe crystal grains with plastic deformationcapacity and a brittle multi-phase structure high silicon steel billet with the high-Si phase are formed; and several times of cold rolling and low-temperature diffusion sintering are performed, thenvacuum or reducing atmosphere protective sintering is performed at the temperature of 1270-1320 DEG C, and the high silicon steel strip with 4.5-6.7% Si is obtained, and the thickness is 0.1-0.5mm andthe density is more than or equal to 7.39g / cm3.

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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IPC IPC(8): B22F3/20B22F3/18B22F1/00C22C33/02B22F3/10C22C38/02
CPCB22F1/0003C22C33/0207C22C38/02B22F3/10B22F3/1007B22F3/18B22F3/20B22F2003/208B22F2998/10B22F1/10
Inventor 罗丰华牟楠贾吉祥李益民王占波
Owner CENT SOUTH UNIV
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