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Method for preparing high silicon steel thin strip by powder hot isostatic pressure

A technology of hot isostatic pressing and isostatic pressing, used in metal processing equipment, transportation and packaging, etc., can solve the problems of unsatisfactory scale and output, high energy consumption and cost, and harsh operating environment.

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

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 by powder hot isostatic pressure
  • Method for preparing high silicon steel thin strip by powder hot isostatic pressure
  • Method for preparing high silicon steel thin strip by powder hot isostatic pressure

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 0.06% paraffin micropowder and 0.01% engine oil in the total amount of raw materials. Dehydrated alcohol is added according to the amount of 200ml / ton.

[0047] After the above powders are fully mixed, they are covered with soft iron, under the action of hot isostatic pressing of 200 MPa in the temperature range of 1060 ° C, and the holding time is 2 hours 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 261MPa, see figure 1 , and exhibit plasticity.

[0048] The above-mentioned hot isostatic pressing plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 36mm→24mm→17mm→12mm→9.5mm→...

Embodiment 2

[0052] 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 0.2% 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.

[0053] After the above powders are fully mixed, use a soft iron sheath, and in the temperature range of 1160 ° 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 390MPa.

[0054] 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→1.6mm→1.02mm→1.02...

Embodiment 3

[0059] 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 0.2% paraffin wax powder 0.1% engine oil of the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton.

[0060] After the above powders are fully mixed, they are covered with soft iron, under the action of hot isostatic pressing of 150 MPa in the temperature range of 1120 ° C, and the holding time is 1.5 h to obtain a uniform and dense compact. The sheathing was removed by machining, and the blank was machined into a square of 46 x 200 x 200 mm. Compact density reaches 6.88g / cm 3 . Three-point bending test test bending strength reached 280MPa.

[0061] 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→7.2mm→5mm→3.5mm→2.4mm→1.6mm→...

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Abstract

Disclosed is a method for preparing a high silicon steel thin strip by powder hot isostatic pressure. The method for preparing the high silicon steel thin strip by the powder hot isostatic pressure adopts reduced Fe powder and high-purity silicon iron powder with the content of Si being 50-70% as raw materials, and Fe-Si mixed powder is formed. Adhesives and dispersants are added and mixed uniformly, then obtained powder is wrapped with soft iron, and a uniform and compact pressed billet is obtained under the temperature range of 1060 DEG C-1160 DEG C and the effect of the hot isostatic pressure of 100-200 MPa; and the pressed billet is composed of poor-Si alpha-Fe grains and a brittle high Si phase and has plastic deformation capacity, and the density of the pressed billet is up to 6.78-7.09 g / cm3. Through multiple times of cold rolling and diffusion sintering at low temperature, density is enhanced, and thickness is reduced; then sintering is carried out in the temperature range of 1260-1330 DEG C, homogeneous alloying of high silicon steel is realized with the help of thermal diffusion, and the high silicon steel strip with the thickness of 0.1-0.5 mm, the Si content of 4.5-6.7% and the density of 7.33 / cm3 or above 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 powder hot isostatic pressing and rolling deformation method 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 wit...

Claims

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Application Information

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IPC IPC(8): B22F3/15B22F3/18B22F1/00C22C33/02B22F3/10C22C38/02
CPCB22F1/0003C22C33/0207C22C38/02B22F3/1007B22F3/15B22F3/18B22F2998/10B22F1/10
Inventor 罗丰华吴宁王柏钧唐紫薇贾吉祥李益民
Owner CENT SOUTH UNIV