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A method for preparing fe-6.5%si soft magnetic material thin strips by powder hot isostatic pressing

A fe-6.5%si, soft magnetic material technology, applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., 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

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Problems solved by technology

[0011] The purpose of this invention is to provide a method for preparing Fe-6.5%Si soft magnetic material thin strips by hot isostatic pressing of powder, aiming at the problem that Fe-4.5~6.7%Si alloy thin strips are difficult to form, water atomized Fe The powder is evenly mixed with high-purity ferrosilicon powder with a Si content of 70-80%. Using the high-temperature softening effect of hot isostatic pressing and the characteristics of uniform pressure, a high-density uniform slab is prepared, and under the action of thermal diffusion Realize partial alloying and form 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 for preparing fe-6.5%si soft magnetic material thin strips by powder hot isostatic pressing
  • A method for preparing fe-6.5%si soft magnetic material thin strips by powder hot isostatic pressing
  • A method for preparing fe-6.5%si soft magnetic material thin strips by powder hot isostatic pressing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mix -100 mesh water atomized Fe powder with Fe-80%Si high-purity powder with particle size ≤10μm according to the ratio of 91.625:8.375 to form Fe-6.7%Si mixed powder. When mixing, add 0.2% paraffin micropowder and 0.1% engine oil in the total amount of raw materials. Dehydrated alcohol is added according to the amount of 200ml / ton.

[0048] After the above powders are fully mixed, they are covered with soft iron, under the action of hot isostatic pressing of 200MPa in the temperature range of 1065°C, and the holding time is 1.5h to obtain a uniform and dense compact. The sheath was removed by machining and the blank was machined into a 36 x 100 x 100 mm square. Compact density reaches 6.73g / cm 3 . Three-point bending test test bending strength reaches 262MPa, see figure 1 , and exhibit plasticity.

[0049] The above-mentioned hot isostatic pressing plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 36mm→24mm→17mm→12mm→...

Embodiment 2

[0053] Mix -100 mesh water atomized Fe powder 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 0.2% zinc stearate and 0.01% machine oil of the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton.

[0054] After the above powders are fully mixed, use a soft iron sheath, in the temperature range of 1165 ° C, under the action of hot isostatic pressing of 100 MPa, the holding time is 0.5 h, and a uniform and dense compact is obtained. The sheathing was removed by machining, and the blank was machined into a square of 54 x 300 x 300 mm. Compact density reaches 7.05g / cm 3 . Three-point bending test test bending strength reached 459MPa.

[0055] The above-mentioned hot isostatic pressing plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 54mm→36mm→36mm→24mm→17mm→12mm→9.5mm→7.2mm→5mm→3.5mm→2.4mm→...

Embodiment 3

[0060] Mix -100 mesh water atomized Fe powder with Fe-76% Si high-purity powder with a particle size of ≤10 μm in a ratio of 91.45:8.55 to form Fe-6.5% Si mixed powder. When mixing, add 0.1% paraffin micropowder, 0.1% methylcellulose, and 0.1% machine oil in the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton.

[0061] After the above powders are fully mixed, use a soft iron sheath, in the temperature range of 1120 ° C, under the action of hot isostatic pressing of 160 MPa, the holding time is 0.8 h, and a uniform and dense compact is obtained. The sheathing was removed by machining, and the blank was machined into squares of 46 x 150 x 150 mm. Compact density reaches 6.73~7.05g / cm 3 . Three-point bending test test bending strength reached 289MPa.

[0062] The above-mentioned hot isostatic pressing plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 46mm→ 36mm→24mm→17mm→12mm→9.5mm→...

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Abstract

A method for preparing single-phase Fe-6.5% Si silicon steel by hot isostatic pressing of powder, the invention adopts water atomization Fe powder, Fe-70-80% Si high-purity ferrosilicon powder raw material to form Fe-4.5-6.7% Si Mix powder. Add binder and dispersant and mix evenly; use soft iron sheath, hot isostatic pressing at 1065~1165℃, 100~200MPa, to obtain uniform and dense compact, consisting of Si-poor α-Fe grains and brittle high Si Phase composition, with plastic deformation ability, green compact density reaches 6.88 ~ 7.10g / cm 3 . Through multiple cold rolling and low-temperature diffusion sintering, the density increases and the thickness decreases, and finally sintered in the temperature range of 1265-1335°C. With the help of thermal diffusion, the homogeneous alloying of high-silicon steel is achieved, and the silicon content of 4.5-6.7% is obtained. 0.1 ~ 0.5mm thick, density ≥ 7.39g / cm 3 high silicon steel strip.

Description

technical field [0001] The invention belongs to the field of preparation and processing of metal materials, and in particular relates to a powder hot isostatic pressing and rolling deformation method 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 cost of Fe-Si alloy s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15B22F3/18B22F1/00C22C33/02B22F3/10C22C38/02H01F41/02H01F1/147
CPCB22F1/0003H01F1/14775H01F41/02C22C33/0207C22C38/02B22F3/1007B22F3/15B22F3/18B22F2998/10B22F1/10
Inventor 罗丰华温家飞王柏钧廖相巍李益民陈雪阳
Owner CENT SOUTH UNIV