Magnetic sensitive material with high sensitivity

A magneto-sensitive material and sensitive technology, applied in the field of highly sensitive magneto-sensitive materials, can solve the problems of insufficient impedance change rate and magnetic field sensitivity, high cost and low cost performance

Inactive Publication Date: 2009-10-07
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the face of ever-increasing new demands for technological development, the impedance change rate and magnetic field sensitivity of existing magnetically sensitive materials are not high enough, especially in weak magnetic fields; the magnetic field sensitivity is extremely low; and the cost is high and the cost performance is low

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Prepare magnetic sensitive material of the present invention as follows:

[0020] (1) Selection of the master alloy: the composition of the master alloy includes 36% atomic ratio of Fe, 36% atomic ratio of Co, 19.2% atomic ratio of B, 4.8% atomic ratio of Si, and 4% atomic ratio of Nb according to the atomic ratio .

[0021] (2) The amorphous alloy wire of the present invention is prepared by a single-roll rapid quenching method comprising the following sub-steps.

[0022] (a) Put the master alloy composed of the above atomic ratio into a quartz glass tube whose softening temperature is higher than 1400°C.

[0023] (b) Under the protection of argon, heat the master alloy by high-frequency induction until it melts, and continue to heat until superheated.

[0024] (c) Ventilate and pressurize the molten alloy to spray from the nozzle at the bottom of the quartz glass tube to the smooth surface of the high-speed rotating cooling roller, so that the molten alloy liquid is...

Embodiment 2

[0030] Prepare highly sensitive magnetic sensitive material of the present invention as follows:

[0031] (1) Selection of the master alloy: the composition of the master alloy includes 56% atomic ratio of Fe, 16% atomic ratio of Co, 19.2% atomic ratio of B, 4.8% atomic ratio of Si, and 4% atomic ratio of Nb according to the atomic ratio .

[0032] (2) The amorphous alloy wire of the present invention is prepared by a single-roll rapid quenching method comprising the following sub-steps.

[0033] (a) Put the master alloy composed of the above atomic ratio into a quartz glass tube whose softening temperature is higher than 1400°C.

[0034] (b) Under the protection of argon, heat the master alloy by high-frequency induction until it melts, and continue to heat until superheated.

[0035] (c) Ventilate and pressurize the molten alloy to spray from the nozzle at the bottom of the quartz glass tube to the cooling roller rotating at high speed to cool the molten alloy liquid into ...

Embodiment 3

[0040] Prepare highly sensitive magnetic sensitive material of the present invention as follows:

[0041] (1) Selection of the master alloy: the composition of the master alloy includes 73.5% atomic ratio of Fe, 1% atomic ratio of Cu, 9% atomic ratio of B, 13.5% atomic ratio of Si, and 3% atomic ratio of Nb according to the atomic ratio .

[0042] (2) The amorphous alloy wire of the present invention is prepared by a single-roll rapid quenching method comprising the following sub-steps.

[0043] (a) Put the master alloy composed of the above atomic ratio into a quartz glass tube whose softening temperature is higher than 1400°C.

[0044] (b) Under the protection of argon, heat the master alloy by high-frequency induction until it melts, and continue to heat until superheated.

[0045] (c) Ventilate and pressurize the molten alloy to be sprayed from the nozzle at the bottom of the quartz glass tube into the water rotating at high speed, so that the molten alloy liquid is cool...

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Abstract

The invention relates to a magnetic material, in particular to a magnetic sensitive material with high sensitivity, wherein the magnetic sensitive material contains Fe and the alloy consisting of one or more compositions of Co, B, Si, Nb, V, Mn, Cu, Ni and Cr; the magnetic material is characterized in that the external surface layer is an amorphous shell layer and the inside of the magnetic sensitive material is a composite structure with a nano-crystalline internal core material. The nano-crystalline structure has the advantages of easy magnetization and high permeability in the longitudinal direction and the amorphous structure has the advantages of easy magnetization and high permeability in the ring direction vertical to the longitudinal direction; and the combination of the nano-crystalline structure and the amorphous structure can greatly improve the change rate of impedance and the magnetic field sensitivity, greatly improves the magnetic field sensitivity at a weak magnetic field, has the advantages of low-sensitivity response critical magnetic field (wherein the sensitivity response magnetic field can be less than 5A/m), being sensitive to weak magnetic field without needing a bias field, reducing the power dissipation of a magneto-dependent sensor, low cost, etc., and is a magnetic sensitive material with high cost-performance ratio and high sensitivity.

Description

technical field [0001] The invention relates to a magnetic sensitive material, in particular to a highly sensitive magnetic sensitive material. Background technique [0002] The magnetic field sensitivity of existing magnetic sensitive materials is generally in the range of 10 2 % / Oe(10 1 % / A·m -1 ), and its sensitivity is lower at weak magnetic fields less than 10e. Although such sensitivity has obvious advantages over traditional materials, the development of current science and technology urgently needs higher sensitivity, especially the advent of new magnetic sensitive materials with high sensitivity to near-zero weak external magnetic fields. In addition, most of the current materials with relatively good performance use Co as the main component. Co is a strategic control material and is expensive. Such as the patent of the People's Republic of China whose application number is 200710301957.X and whose publication number is CN 101236817A. Therefore, in the face of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/153C22C30/00
Inventor 方允樟郑金菊吴锋民许启明满其奎
Owner ZHEJIANG NORMAL UNIVERSITY
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