Method for preparing high-silicon steel strip through high-temperature diffusion sintering and powder extrusion

A technology of high-temperature diffusion and high-silicon steel, which is applied in metal processing equipment, transportation and packaging, etc., and can solve the problem that Fe-Si alloy thin strips are difficult to form

Inactive Publication Date: 2018-04-13
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 high-silicon steel strips by high-temperature diffusion sintering and powder extrusion. Aiming at the problem that Fe-Si alloy thin strips with a Si content of 4.5-6.7% are difficult to form, industrial pure Fe powder and fine The elemental Si powder is uniformly 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 structure is finer 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 preparing high-silicon steel strip through high-temperature diffusion sintering and powder extrusion
  • Method for preparing high-silicon steel strip through high-temperature diffusion sintering and powder extrusion
  • Method for preparing high-silicon steel strip through high-temperature diffusion sintering and powder extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Prepare -100 mesh reduced Fe powder and -100 mesh water atomized Fe powder according to the mass ratio of 4:6, and use a drum mixer to mix them to form industrial pure Fe powder raw materials. The mixing time is 2 hours. During the mixing process, 200ml / Tons of absolute ethanol was added.

[0050] The pre-mixed industrial pure Fe powder is mixed with the elemental Si powder with a particle size of ≤3 μm according to the 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.

[0051] 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. ...

Embodiment 2

[0057] Prepare -100 mesh reduced Fe powder and -100 mesh water atomized Fe powder according to the mass ratio of 5:6, and use a drum mixer to mix them to form industrial pure Fe powder raw materials. The mixing time is 3 hours. During the mixing process, 400ml / Tons of absolute ethanol was added.

[0058] The pre-mixed industrial pure Fe powder is mixed with the elemental Si powder with a particle size of ≤3 μm according to the 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.

[0059] 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 de...

Embodiment 3

[0065] Prepare -100 mesh reduced Fe powder and -100 mesh water atomized Fe powder according to the mass ratio of 6:4, and use a drum mixer to mix them to form industrial pure Fe powder raw materials. The mixing time is 4 hours. During the mixing process, 500ml / Tons of absolute ethanol was added.

[0066] The pre-mixed industrial pure Fe powder is mixed with the elemental Si powder with a particle size of ≤3 μm according to the 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.

[0067] 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...

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Abstract

Disclosed is a method for preparing a high-silicon steel strip through high-temperature diffusion sintering and powder extrusion. The method comprises the steps that two kinds of industrial Fe powderof reduced Fe powder and water atomized Fe powder are selected and mixed according to the proportion of 4:6-6:4, then fine Si powder is added as raw powder, and thus Fe-Si mixed powder is formed withthe Si content being 4.5%-6.7%; a square blank is formed through die pressing, heating is conducted till the temperature reaches 950-1050 DEG C, thus a Fe phase is austenitized, and the square blank is subjected to hot extrusion into a slab through deformation with the extrusion ratio being 8-16; then the powder extruded slab is sintered under vacuum protection or reducing atmosphere protection atthe temperature of 1080-1180 DEG C for metallurgical bonding of Fe powder particles; and after the multiple times of cold rolling and low-temperature diffusion sintering, sintering is conducted undervacuum protection or reducing atmosphere protection at the temperature of 1280-1350 DEG C finally, homogeneous alloying of high-silicon steel is achieved, and thus the high-silicon steel strip with the Si content being 4.5%-6.7%, the thickness being 0.1-0.5 mm and the density being larger than or equal to 7.39 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): B22F3/20B22F3/18B22F1/00C22C33/02B22F3/10C22C38/02
CPCB22F1/0003C22C33/02C22C38/02B22F3/10B22F3/1007B22F3/18B22F3/20B22F2003/208B22F2998/10B22F1/10
Inventor 丁艺罗丰华谭永菊徐雪白云波
Owner CENT SOUTH UNIV
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