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Method for preparing Fe-6.5% Si strip by powder extrusion and diffusion sintering processes

A fe-6.5%si, diffusion sintering technology, used in metal processing equipment, transportation and packaging, etc., can solve the problem of difficult forming of alloy thin strips

Inactive Publication Date: 2018-05-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing Fe-6.5% Si thin strips by powder extrusion and high-temperature diffusion sintering, aiming at the problem that the Fe-Si alloy thin strips with 4.5-6.7% Si content are difficult to form, and using industrial pure Fe powder and high-purity ferrosilicon powder with a Si content of 70-80% are used as raw materials. After adding a forming agent, they are molded into an extrusion green body, and then a slab of a certain thickness is prepared by powder hot extrusion. The large deformation effect increases the density of the extruded billet, refines the structure, and realizes 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 Fe-6.5% Si strip by powder extrusion and diffusion sintering processes
  • Method for preparing Fe-6.5% Si strip by powder extrusion and diffusion sintering processes
  • Method for preparing Fe-6.5% Si strip by powder extrusion and diffusion sintering processes

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 Fe-80% Si high-purity powder with a particle size of ≤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.

[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 to...

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 Fe-70% Si high-purity powder with particle size ≤ 10 μm according to the 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.

[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 den...

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 and Fe-76% Si high-purity powder with a particle size of ≤10 μm are mixed according to the 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.

[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 pr...

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Abstract

The invention discloses a method for preparing a Fe-6.5% Si strip by powder extrusion and diffusion sintering processes. The method comprises the steps that reduced Fe powder and water atomized Fe powder are selected and mixed according to the ratio of 4:6-6:4, then high-purity ferrosilicon powder with the Si content of 70-80% is added to form Fe-4.5-6.7% Si mixed powder; and mold pressing is carried out to form a square blank, then the square blank is heated to 950-1050 DEG C to realize Fe-phase austenitizing, hot extrusion is carried out by using the deformation amount with the extrusion ratio being 8-16 to form a slab, then vacuum or reducing atmosphere protection sintering is carried out at the temperature of 1070-1170 DEG C to make Fe powder particles realize metallurgical bonding, cold rolling and low-temperature diffusion sintering are carried out for multiple times, finally vacuum or reducing atmosphere protection sintering is carried out at the temperature of 1275-1335 DEG C to realize homogenization alloying of the high silicon steel, and the high silicon steel strip with 4.5-6.7% of Si, the thickness of 0.1-0.5 mm and the density larger than or equal to 7.40g / 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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IPC IPC(8): B22F3/20B22F3/18B22F3/10B22F1/00C22C38/02C22C33/02
CPCB22F1/0003C22C33/02C22C38/02B22F3/1007B22F3/18B22F3/20B22F2003/208B22F2998/10B22F1/10
Inventor 丁艺罗丰华黄小琴
Owner CENT SOUTH UNIV
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