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Method for preparing high silicon steel thin strip through powder hot pressing sintering

A hot-pressing sintering, high-silicon steel technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high energy consumption and cost, complex process, unsatisfactory scale and output, etc.

Inactive Publication Date: 2018-03-30
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 operating environment is not good. It is harsh and cannot meet environmental protection requirements

Method used

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  • Method for preparing high silicon steel thin strip through powder hot pressing sintering
  • Method for preparing high silicon steel thin strip through powder hot pressing sintering
  • Method for preparing high silicon steel thin strip through powder hot pressing sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Mix -100 mesh reduced Fe powder with Fe-70% Si high-purity powder with a particle size of ≤6 μm in a 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.

[0047] A square compact was prepared by compression molding, with a surface pressure of 600MPa, a compact size of 100×100×40mm, and a compact density of 6.36g / cm 3 .

[0048] 100MPa uniaxial pressure hot pressing sintering, hot pressing sintering at 920°C for 2 hours, the thickness of the billet is about 36mm, and the density reaches 6.68g / cm 3 . Three-point bending tests exhibit plasticity, see figure 1 , the bending strength reaches 147MPa.

[0049] The above-mentioned hot-pressed sintered plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is...

Embodiment 2

[0053] Mix -100 mesh reduced Fe powder with Fe-50% Si high-purity powder with a particle size of ≤10 μm in a ratio of 91:9 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.

[0054] A square compact was prepared by compression molding, with a surface pressure of 400MPa, a compact size of 300×300×60mm, and a compact density of 6.53g / cm 3 .

[0055] 160MPa uniaxial pressure hot pressing sintering, hot pressing sintering at 980°C for 0.5h, the thickness of the billet is about 54mm, and the density reaches 7.04g / cm 3 . The three-point bending test showed plasticity, and the bending strength reached 347MPa.

[0056] The above-mentioned hot-pressed sintered plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 54mm→36mm→36mm→24mm→17mm→12m...

Embodiment 3

[0061] Mix -100 mesh reduced Fe powder with Fe-60% Si high-purity powder with particle size ≤ 6 μm according to the ratio of 89.17:10.83 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.

[0062] A square compact was prepared by compression molding, with a surface pressure of 500MPa, a compact size of 120×120×50mm, and a compact density of 6.40g / cm 3 .

[0063] 120MPa uniaxial pressure hot pressing sintering, hot pressing sintering at 960°C for 1h, the thickness of the billet is about 46mm, and the density reaches 6.76g / cm 3 . The three-point bending test showed plasticity, and the bending strength reached 217MPa.

[0064] The above-mentioned hot-pressed sintered plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing...

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Abstract

The invention discloses a method for preparing a high silicon steel thin strip through powder hot pressing sintering. Reduction Fe powder and high pure ferrosilicon powder are adopted to form an Fe-Simixed powder, through die pressing, a square blank is formed, the single-axis pressurizing manner is adopted, hot pressing sintering is carried out for 0.5 h to 2 h under the conditions that the temperature ranges from 920 DEG C to 980 DEG C, and the pressure ranges from 100 MPa to 160 MPa, the density of the pressing blank reaches 6.72 to 7.04 g / cm<3>, the powder hot pressing sintering black issubject to vacuum or reduction atmosphere protection sintering at the temperature ranging from 1050 DEG C to 1150 DEG C, Fe powder particle metallurgy combination is achieved, ferrosilicon powder particles and Fe achieve the partial alloying, and repeated low-temperature diffusion sintering and cold rolling thinning are carried out; finally, high-temperature diffusion sintering is carried out at the temperature ranging from 1250 DEG C to 1300 DEG C, homogeneous alloying is achieved, and the high silicon steel thin strip with the Si ranging from 4.5 to 6.7%, the thickness ranging from 0.1 mm to0.5 mm and the density large than or equal to 7.28g / cm<3> is obtained.

Description

technical field [0001] The invention belongs to the field of preparation and processing of metal materials, and in particular relates to a method for powder hot-pressing sintering 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): B22F3/14B22F3/16B22F3/02B22F1/00C22C33/02B22F3/10
CPCB22F1/0003C22C33/0207B22F3/02B22F3/1007B22F3/14B22F3/162B22F2998/10B22F2003/145B22F1/10
Inventor 罗丰华卢静王柏钧贾吉祥李益民陈程
Owner CENT SOUTH UNIV
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