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Fe-based nanocrystalline soft magnetic alloy and preparation method

A technology of iron-based nanocrystals and soft magnetic alloys, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., to achieve high magnetic performance stability, low coercive force, and small magnetic crystal anisotropy

Active Publication Date: 2020-04-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned patented ingredients and preparation methods still cannot simultaneously have comprehensive performances such as low cost, high thermal stability (high process window), high magnetic permeability and high corrosion resistance, so it is difficult to prepare a large-scale solution that can solve complex and harsh environments. Electromagnetic Compatibility Problems of Nanocrystalline Soft Magnetic Materials

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  • Fe-based nanocrystalline soft magnetic alloy and preparation method
  • Fe-based nanocrystalline soft magnetic alloy and preparation method
  • Fe-based nanocrystalline soft magnetic alloy and preparation method

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Experimental program
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Embodiment 1

[0063] In the present embodiment, the molecule of iron-based nanocrystalline soft magnetic alloy material is Fe 69.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 Al 6 .

[0064] The concrete preparation method of this iron-based nanocrystalline alloy is as follows:

[0065] (1) Fe, Si, FeB, FeP, FeNb, Cu and Al of industrial purity are used as raw materials according to Fe 69.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 Al 6 A quenched amorphous strip with a width of about 1 mm and a thickness of about 23 μm was prepared by batching, master alloy smelting, and single-roll quenching technology, and the copper roll speed was 30 m / s.

[0066] (2) NETZSCH DSC404C differential scanning calorimeter (DSC) was used to measure the crystallization temperature of the alloy strip at a heating rate of 0.67K / s.

[0067] Such as figure 1 As shown, the temperature at which α-Fe nanocrystals start to precipitate is the temperature at which the first crystallization peak begins to crystallize (T x1 ) is 768K, ...

Embodiment 2

[0076] In the present embodiment, the molecule of iron-based nanocrystalline soft magnetic alloy material is Fe 71.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 Al 4 .

[0077] The concrete preparation method of this iron-based nanocrystalline alloy is as follows:

[0078] (1) Fe, Si, FeB, FeP, FeNb, Cu and Al of industrial purity are used as raw materials according to Fe 71.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 Al 4 A quenched amorphous strip with a width of about 1 mm and a thickness of about 23 μm was prepared by batching, master alloy smelting, and single-roll quenching technology, and the copper roll speed was 30 m / s.

[0079] (2) The crystallization temperature of the quenched amorphous strip was measured by DSC at a heating rate of 0.67K / s. Such as figure 1 As shown, the T of the quenched amorphous strip x1 770K, T x2 is 966K, and the heat treatment temperature window ΔT is 196K.

[0080] (3) to Fe 71.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 al 4 The alloy is heat treated for nanoc...

Embodiment 3

[0089] In the present embodiment, the molecule of iron-based nanocrystalline soft magnetic alloy material is Fe 73.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 al 2 .

[0090] The concrete preparation method of this iron-based nanocrystalline alloy is as follows:

[0091] (1) Fe, Si, FeB, FeP, FeNb, Cu and Al of industrial purity are used as raw materials according to Fe 73.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 al 2 A quenched amorphous strip with a width of about 1 mm and a thickness of about 23 μm was prepared by batching, master alloy smelting, and single-roll quenching technology, and the copper roll speed was 30 m / s.

[0092] (2) The crystallization temperature of the rapidly quenched amorphous strip was measured by DSC at a heating rate of 0.67K / s. Such as figure 1 As shown, the T of the rapidly quenched amorphous strip x1 for 771K, T x2 is 957K, so the heat treatment temperature window ΔT is 186K.

[0093] (3) to Fe 73.8 Si 12 B 8 Nb 2.6 Cu 0.6 P 1 al 2 The alloy is h...

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Abstract

The invention discloses an Fe-based nanocrystalline soft magnetic alloy. The molecular formula of the alloy is FeaSibBcMdCuePfAlg, M refers to the metallic element Nb, Mo, V, Mn or Cr, a, b, c, d, e,f and g are mole percentage content of corresponding atoms, b is larger than or equal to 6 but smaller than or equal to 15, c is larger than or equal to 5 but smaller than or equal to 12, d is largerthan or equal to 0.5 but smaller than or equal to 3, e is larger than or equal to 0.5 but smaller than or equal to 1.5, f is larger than or equal to 0.5 but smaller than or equal to 3, g is larger than or equal to 0.5 but smaller than or equal to 10, and the balance is Fe and inevitable trace impure elements; the structure of the Fe-based nanocrystalline soft magnetic alloy is the two-phase alloywith the Fe adopting the body-centered cubic structure and Fe(Si, Al) mixed nanocrystalline grains embedded in an amorphous matrix, and the average size ranges from 10 nm to 13 nm. The invention further provides a preparation method of the Fe-based nanocrystalline soft magnetic alloy. The method includes two-step heating and two-step cooling heat treatment. The Fe-based nanocrystalline soft magnetic alloy has the advantages of low cost, excellent soft magnetic property, high corrosion resistance as well as good manufacturability and heat treatment processability, and has the broad applicationprospects in the fields of noise suppression, filtration, wireless charging and the like in complex and harsh environments.

Description

technical field [0001] The invention relates to the technical field of iron-based nanocrystalline soft magnetic alloy materials, in particular to an iron-based nanocrystalline soft magnetic alloy with low coercive force, high magnetic permeability, high thermal stability and high corrosion resistance and a preparation method thereof . Background technique [0002] With the rapid development of technologies such as 5G communication and wireless charging, problems such as electromagnetic interference and health hazards caused by electromagnetic wave radiation are becoming more and more serious. Soft magnetic materials are commonly used materials to suppress magnetic field interference. Due to the small skin effect and low wave impedance of low-frequency electromagnetic waves (frequency below 300kHz), the absorption and reflection loss of materials for low-frequency magnetic field radiation becomes very small, so the problem of low-frequency magnetic shielding has always been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/02C22C33/04C22C38/00C22C38/02C22C38/06C22C38/16H01F1/147H01F1/153
CPCC22C33/003C22C33/04C22C38/002C22C38/02C22C38/06C22C38/16C22C45/02H01F1/14791H01F1/15308H01F1/15333H01F1/15341
Inventor 黎嘉威刘延新吴佳欣贺爱娜董亚强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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