Method for powder extrusion preparing of single-phase Fe-6.5% Si silicon steel

A powder, single-phase technology used in metal processing equipment, transportation and packaging to 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 purpose of the present invention is to provide a method for preparing single-phase Fe-6.5% Si silicon steel by powder extrusion, aiming at the problem that Fe-Si alloy thin strips with 4.5-6.7% Si content are difficult to form, to reduce Fe powder and fine Elemental Si powder is evenly mixed, 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 structure is refined by using the large deformation effect of hot extrusion , 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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  • Method for powder extrusion preparing of single-phase Fe-6.5% Si silicon steel
  • Method for powder extrusion preparing of single-phase Fe-6.5% Si silicon steel
  • Method for powder extrusion preparing of single-phase Fe-6.5% Si silicon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mix -100 mesh reduced 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.

[0048] 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 .

[0049] 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 and extru...

Embodiment 2

[0054] Mix -100 mesh reduced 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 0.6% 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.

[0055] 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 6.49g / cm 3 .

[0056] 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 preh...

Embodiment 3

[0061] Mix -100 mesh reduced 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.

[0062] 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 6.38g / cm 3 .

[0063] 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 barrel and e...

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Abstract

The invention discloses a method for powder extrusion preparing of single-phase Fe-6.5% Si silicon steel. Reduced Fe powder and Si powder are adopted as raw material powder, and Fe-4.5-6.7% Si mixed powder is formed. A square blank is formed through die pressing, then, heating is conducted to 950-1,050 DEG C, Fe phase austenitizing is achieved, and a slab is formed through hot extrusion with the deformation extrusion ratio being 8-16. Then, the powder extruded slab is subjected to vacuum or reducing atmosphere protective sintering at the temperature ranging from 1,080 DEG C to 1,180 DEG C, Fepowder particles are in metallurgical bonding, Si and Fe are partially alloyed, and a poor Si alpha-Fe grain and high-brittleness Si-phase multi-phase structure high-silicon steel blank is formed; andmulti-time cold rolling and low-temperature diffusion sintering are conducted, vacuum or reducing atmosphere protective sintering is conducted at the temperature ranging from 1,280 DEG C to 1,350 DEGC, high-silicon steel homogeneous alloying is achieved, and a high-silicon steel strip in which the content of Si ranges from 4.5% to 6.7%, the thickness ranges from 0.1 mm to 0.5 mm, and the densityis larger than or equal to 7.37 g / cm<3> 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): B22F1/00B22F3/18B22F3/20B22F3/10C22C38/02C22C33/02
CPCC22C33/02C22C38/02B22F3/1007B22F3/18B22F3/20B22F2003/208B22F2998/10B22F2999/00B22F1/10B22F2201/20B22F2201/01B22F2201/10B22F3/02
Inventor 罗丰华周浩钧李益民白云波赵甲正
Owner CENT SOUTH UNIV
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