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Soft magnetic alloy strip for ultra-low temperature magnetic shielding and preparation method for soft magnetic alloy strip

A soft magnetic alloy tape and magnetic shielding technology, which is applied in the field of iron-nickel soft magnetic alloys, can solve the problems of inability to meet the application requirements of magnetic shielding at ultra-low temperature and the decrease of magnetic permeability.

Active Publication Date: 2020-05-05
BEIJING BEIYE FUNCTIONAL MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the soft magnetic alloys with high initial magnetic permeability mainly include 1J79, 1J85 and 1J77, while the magnetic permeability of 1J79, 1J85, and 1J77 alloys is greatly reduced at liquid nitrogen temperature, and the initial magnetic permeability of 1J79 at liquid nitrogen temperature μ 0.08 Only 20mH / m, which is 60% lower than that at room temperature, and the initial permeability of 1J85 at liquid nitrogen temperature μ 0.08 It is only 12.5mH / m, which is up to 90% lower than that at room temperature, and the initial permeability of 1J77 at liquid nitrogen temperature μ 0.08 It is only 12.5mH / m, which is 70% lower than that at room temperature. As the temperature further decreases to the temperature of liquid helium, the magnetic permeability of these three alloys continues to decrease, which cannot meet the application requirements of magnetic shielding at ultra-low temperature

Method used

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  • Soft magnetic alloy strip for ultra-low temperature magnetic shielding and preparation method for soft magnetic alloy strip

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The specific chemical composition mass percent of the alloy is: C 0.005%, Ni 76.2%, Cu 4.6%, Mo 2.2%, Ce 0.002%, Si 0.08%, Mn 0.21%, and the balance is Fe and unavoidable impurities. Electrolytic copper with a purity of 99.9%, electrolytic nickel with a purity of 99.9%, metallic molybdenum with a purity of 99.7%, metallic iron with a purity of 99.7%, C, Ce, Si, and Mn are mixed in proportion and loaded into a crucible. It is smelted in a vacuum induction furnace, the alloy refining temperature is 1550°C, the tapping temperature is 1480°C, and cast into steel ingots. The steel ingot is heat-preserved at 1280°C and forged into an 80mm thick slab, and then hot-rolled at 1260°C with heat-retaining deformation of 95%. After the hot rolling, the slab is subjected to initial rolling, and the initial rolling deformation is 60%, and then annealed at 1050° C., and the holding time is 2 minutes. After annealing, roll again, the deformation amount is 40%, and then the strip is sub...

Embodiment 2

[0030] The specific chemical composition mass percent of the alloy is: C 0.013%, Ni 75.3%, Cu 3.9%, Mo 1.4%, Ce<0.001%, Si 0.46%, Mn 0.72%, and the balance is Fe and unavoidable impurities. Prepare according to the ingredients and process corresponding to Example 2 in Table 1.

Embodiment 3

[0032] The specific chemical composition mass percent of the alloy is: C 0.008%, Ni 79.1%, Cu 2.8%, Mo 1.9%, Ce 0.004%, Si 0.22%, Mn 0.98%, and the balance is Fe and unavoidable impurities. Prepare according to the ingredients and process corresponding to Example 3 in Table 1.

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Abstract

The invention discloses a soft magnetic alloy strip for ultra-low temperature magnetic shielding and a preparation method for the soft magnetic alloy strip, and belongs to the technical field of softmagnetic alloys. The alloy strip comprises the following chemical component in mass percentage: 0-0.02% of C, 75.0-80.0% of Ni, 2.0-4.7% of Cu, 1.0-3.4% of Mo, 0.0001-0 .05% of Ce, 0-0.5% of Si, 0.2-1.0% of Mn and the balance of Fe and inevitable impurities. The magnetic properties of a final product at a liquid nitrogen temperature are as follows: the initial permeability u 0.08 is 118.6 mh / m, permeability u 0.4 is 316.9 mh / m, the maximum permeability um is 686.3 mh / m, the coercivity HC is 0.46 a / m, and the saturation magnetic induction strength Bs is 0.92 T. When the temperature reduces to the liquid helium temperature from -60 DEG C, the initial permeability of the alloy strip is in an increasing trend. The alloy production process comprises the steps of vacuum smelting, forging, hot rolling, cold rolling, annealing, finished product rolling and magnetic property thermal treatment. According to the invention, the soft magnetic alloy strip has the advantages that the alloy strip hashigher magnetic permeability at the ultra-low temperature and is suitable for manufacturing a magnetic shielding device at the ultra-low temperature.

Description

technical field [0001] The invention belongs to the technical field of iron-nickel soft magnetic alloys, and in particular provides a soft magnetic alloy strip for ultra-low temperature magnetic shielding and a preparation method thereof. Background technique [0002] Ultra-low temperature magnetic shielding soft magnetic alloy material is a strategic new functional material in my country. Ultra-low temperature magnetic shielding mainly refers to shielding the geomagnetic field of key equipment at liquid nitrogen temperature, liquid helium temperature and absolute zero to improve the accuracy of key equipment and data. It is mainly used in the magnetic shielding of superconducting electronic laser devices, quantum computers, quantum communications and other equipment working under superconductivity in nuclear physics. [0003] Magnetic shielding refers to the shielding of low-frequency electromagnetic waves. The magnetic shielding device is mainly made of soft magnetic alloy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C21D8/12C21D1/26H01F1/147
CPCC21D1/26C21D8/1222C21D8/1233C22C38/004C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16H01F1/14716
Inventor 雷成辉李占青吕键
Owner BEIJING BEIYE FUNCTIONAL MATERIALS CORP