Method for preparing high silicon steel strip by powder tape casting and high-temperature diffusion sintering

A technology of tape casting and high temperature diffusion, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of unsatisfactory scale and output, harsh working environment and complex process.

Inactive Publication Date: 2018-04-13
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 thi

Method used

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  • Method for preparing high silicon steel strip by powder tape casting and high-temperature diffusion sintering
  • Method for preparing high silicon steel strip by powder tape casting and high-temperature diffusion sintering
  • Method for preparing high silicon steel strip by powder tape casting and high-temperature diffusion sintering

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0049] Example 1

[0050] The -100 mesh water atomized Fe powder is mixed with Fe-70% Si high-purity powder with a particle size ≤ 6 μm in a ratio of 90.43:9.57 to form a Fe-6.7% Si mixed powder. Mix phosphoric acid and absolute ethanol at a ratio of 0.8:100 to prepare passivation solution. Mix the passivation solution with the weighed metal powder at a ratio of 0.4:1, stir with a mixer for 0.5h, then put it into the oven for passivation, the baking temperature is 40℃, and the passivation time is 4h to obtain the passivation powder .

[0051] Use 10:1.0 methyl ethyl ketone and absolute ethanol as a mixed solvent, epoxy resin as a binder, polyethylene glycol as a plasticizer, and triethanolamine as a dispersant. The volume ratio of epoxy resin and polyethylene glycol is 1:1, the adding amount of mixed solvent is 60%, and the adding amount of dispersing agent is 0.1% to form a slurry organic solution. The passivation powder and the organic solution are mixed in a volume ratio of 1...

Example Embodiment

[0057] Example 2

[0058] The -100 mesh water atomized Fe powder is mixed with Fe-50% Si high-purity powder with a particle size ≤ 10 μm in a ratio of 91:9 to form a Fe-4.5% Si mixed powder. Mix phosphoric acid and absolute ethanol at a ratio of 2.0:100 to prepare passivation solution. The passivation solution and the weighed metal powder raw materials were mixed in a ratio of 0.6:1, stirred with a mixer for 2 hours, and then put into an oven for passivation at a baking temperature of 42°C and a passivation time of 6 hours to obtain a passivation powder.

[0059] Use 10:1.0 methyl ethyl ketone and absolute ethanol as a mixed solvent, epoxy resin as a binder, polyethylene glycol as a plasticizer, and triethanolamine as a dispersant. The volume ratio of epoxy resin and polyethylene glycol is 1:1, the adding amount of mixed solvent is 60%, and the adding amount of dispersing agent is 0.1% to form a slurry organic solution. The passivation powder and the organic solution are mixed in...

Example Embodiment

[0066] Example 3

[0067] The -100 mesh water atomized Fe powder is mixed with Fe-60% Si high-purity powder with a particle size ≤ 6 μm in a ratio of 89.17:10.83 to form a Fe-6.5% Si mixed powder. Mix phosphoric acid and absolute ethanol at a ratio of 1.0:100 to prepare a passivation solution. The passivation solution and the weighed metal powder raw materials were mixed at a ratio of 0.5:1, stirred with a mixer for 1 hour, and then put into an oven for passivation at a baking temperature of 40°C and passivation time for 5 hours to obtain passivation powder.

[0068] Use 10:1.0 methyl ethyl ketone and absolute ethanol as a mixed solvent, epoxy resin as a binder, polyethylene glycol as a plasticizer, and triethanolamine as a dispersant. The volume ratio of epoxy resin and polyethylene glycol is 1:1, the adding amount of mixed solvent is 60%, and the adding amount of dispersing agent is 0.1% to form a slurry organic solution. The passivation powder and the organic solution are mixe...

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Abstract

The invention discloses a method for preparing high silicon steel strip by powder tape casting and high-temperature diffusion sintering. According to the method, water-atomized iron powder and high-purity ferrosilicon powder with the Si content being 50-70% are adopted as raw materials to form Fe-4.5-6.7% Si mixed powder; a solvent, a dispersing agent, an adhesive and a plasticizer are added intothe mixed powder so as to prepare stable slurry which is uniformly dispersed, and a biscuit is prepared on a tape casting machine; the biscuit is subjected to vacuum or reducing atmosphere protectionsintering at 1060-1160 DEG C, so that Fe powder particles are not completely sintered, Si and Fe are partially alloyed, and a multi-hole and incompletely-alloyed high silicon steel blank is formed; and repeated cold rolling and incomplete sintering are carried out on the high silicon steel blank, finally vacuum or reducing atmosphere protection sintering is carried out on the high silicon steel blank at 1250-1320 DEG C, so that homogenization alloying of the high silicon steel is realized, and the high silicon steel strip with the Si content being 4.5-6.7%, the thickness being 0.1-0.5 mm and the density greater than or equal to 7.38 g/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 tape casting and sintering densification of high-performance high-silicon steel soft tape materials. 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 o...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/18B22F1/00C22C33/02B22F3/10B22F3/11C22C38/02
CPCC22C33/0207C22C38/02B22F3/1007B22F3/1017B22F3/11B22F3/18B22F3/22B22F2998/10B22F1/107B22F1/145B22F1/0003
Inventor 罗丰华周海铭郭晓琼李益民贾吉祥
Owner CENT SOUTH UNIV
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