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A method of preparing fe-6.5%si strip by diffusion sintering and powder extrusion

A fe-6.5%si, diffusion sintering technology, applied in powder metallurgy sintering, hot extrusion and rolling deformation of high-silicon steel thin strips, can solve the problem that alloy thin strips are difficult to form

Active Publication Date: 2020-06-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a method for preparing Fe-6.5% Si thin 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. Fe powder and high-purity ferrosilicon powder with a Si content of 50-70% 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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  • A method of preparing fe-6.5%si strip by diffusion sintering and powder extrusion
  • A method of preparing fe-6.5%si strip by diffusion sintering and powder extrusion
  • A method of preparing fe-6.5%si strip by diffusion sintering and powder extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Prepare -100 mesh reduced Fe powder and -100 mesh water atomized Fe powder according to the 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, and the mixing process is based on 200ml / ton The proportion of absolute ethanol was added.

[0051] The pre-mixed industrial pure Fe powder is mixed with Fe-70% Si high-purity powder with particle size ≤ 6 μm according to the 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.

[0052] 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 w...

Embodiment 2

[0058] Prepare -100 mesh reduced Fe powder and -100 mesh water atomized Fe powder according to the 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, and the mixing process is 400ml / ton The proportion of absolute ethanol was added.

[0059] The pre-mixed industrial pure Fe powder is mixed with the Fe-50% Si high-purity powder with a particle size of ≤10 μm in a ratio of 91:9 to form a 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.

[0060] 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 c...

Embodiment 3

[0066] Prepare -100 mesh reduced Fe powder and -100 mesh water atomized Fe powder according to the 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, and the mixing process is 500ml / ton The proportion of absolute ethanol was added.

[0067] The pre-mixed industrial pure Fe powder and the Fe-60% Si high-purity powder with a particle size of ≤6 μm are mixed according to the ratio of 89.17:10.83 to form a 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.

[0068] 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 press...

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Abstract

The invention provides a method for preparing a Fe-6.5%Si strip material by diffusion sintering and powder extrusion. The method for preparing the Fe-6.5%Si strip material by the diffusion sintering and the powder extrusion comprises the steps of selecting reduction Fe powders and water-atomized Fe powders, then mixing the reduction Fe powders and the water-atomized Fe powders in the ratio of 4:6- 6:4, and adding high-purity ferrosilicon powder with the Si content of 50-70% to form Fe-4.5-6.7%Si mixed powders; then die pressing the Fe-4.5-6.7%Si mixed powders into a square blank, then heatingthe blank to 950-1050 DEG C to realize the austenization of Fe phase, and hot extruding the blank into a plate blank by the deformation quantity with the extrusion ratio of 8-16; and conducting vacuum or reducing atmosphere protection sintering at the temperature of 1060-1160 DEG C and conducting cold rolling and low temperature diffusion sintering for many times; finally conducting vacuum or reducing atmosphere protection sintering at the temperature of 1260-1320 DEG C to realize the homogeneity alloying of high silicon steel and obtaining a high silicon steel strip material with the thickness of 4.5-6.7%Si being 0.1-0.5 mm and the density being equal to or greater than 7.41g / cm3.

Description

technical field [0001] The invention mainly belongs to the field of preparation and processing of metal materials, and specifically relates to methods for powder metallurgy sintering, hot extrusion and rolling deformation of high-silicon steel thin strips. [0002] technical background [0003] 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/20B22F3/10C22C33/02C22C38/02
CPCB22F3/1007B22F3/20B22F2998/10C22C33/0278C22C38/02B22F1/0003B22F3/18
Inventor 丁艺罗丰华周立岩卢静吴子恺贾吉祥
Owner CENT SOUTH UNIV
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