Powder extrusion manufacturing method of high-silicon steel strip

A manufacturing method and high silicon steel technology, which are applied in the field of hot extrusion and rolling deformation, powder metallurgy sintering of high silicon steel thin strips, and can solve the problems of unsatisfactory scale and output, harsh operating environment and complex process.

Inactive Publication Date: 2018-06-01
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 extrusion manufacturing method of high-silicon steel strip
  • Powder extrusion manufacturing method of high-silicon steel strip
  • Powder extrusion manufacturing method of high-silicon steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Mix -100 mesh reduced Fe powder with Fe-80% Si high-purity powder with a particle size of ≤10 μm at a 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.

[0050] 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 6.32g / cm 3 .

[0051] 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 barre...

Embodiment 2

[0056] Mix -100 mesh reduced Fe powder with Fe-70% Si high-purity powder with a particle size of ≤10 μm at 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.

[0057] 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 6.53g / cm 3 .

[0058] 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

[0063]Mix -100 mesh reduced Fe powder with Fe-76% Si high-purity powder with a particle size of ≤10 μm at 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.

[0064] 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 .

[0065] 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 ba...

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Abstract

The invention discloses a powder extrusion manufacturing method of a high-silicon steel strip. Reduction Fe powder with irregular morphology and fine high-purity ferrosilicon powder with a Si contentof 70-80% are adopted to form Fe-4.5-6.7% Si mixed powder. A square blank is formed through mold pressing; Fe phase austenitizing is realized by heating to 950-1050 DEG C; a plate blank is formed through hot extrusion by deformation with an extrusion ratio of 8-16; then, vacuum or reduction atmosphere protective sintering is performed on the powder extrusion plate blank in a temperature range of 1070-1170 DEG C; then, multiple times of cold rolling and low-temperature dispersion sintering are performed; finally, vacuum or reduction atmosphere protective sintering is performed in a temperaturerange of 1275-1335 DEG C to realize uniform alloying of high-silicon steel; and the high-silicon steel strip with Si of 4.5-6.7%, a thickness of 0.1-0.5 mm and a density of not less than 7.38 g / cm3 isobtained.

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): B22F3/20B22F3/18C22C33/02C22C38/02
CPCB22F3/20B22F3/18B22F2998/10C22C33/0278C22C38/02B22F1/0003B22F2003/208B22F3/10B22F3/1007
Inventor 罗丰华温家飞李益民廖相巍梁健俊
Owner CENT SOUTH UNIV
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