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Method for controlling Co-based amorphous fiber to form core-shell structure and application thereof

A shell structure, amorphous technology, applied in the field of controlling Co-based amorphous fibers to form a core-shell structure, can solve the problems of low GMI performance and other related performance parameters, poor mechanical properties, etc., and achieve excellent soft magnetic and giant magneto-impedance properties , Improve the tensile breaking strength and high performance

Active Publication Date: 2019-10-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early research mainly focused on Fe-based amorphous fibers, although the nano-grain size of its single phase can be adjusted, but the related performance parameters such as GMI performance are low, and the mechanical properties are poor.

Method used

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  • Method for controlling Co-based amorphous fiber to form core-shell structure and application thereof
  • Method for controlling Co-based amorphous fiber to form core-shell structure and application thereof
  • Method for controlling Co-based amorphous fiber to form core-shell structure and application thereof

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Experimental program
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preparation example Construction

[0031] The embodiment of the present invention is aimed at melt drawing Co 68.15 Fe 4.35 Si 12.25 B 15.25-x Zr x , where x=1, 2 or 3, the special "core-shell" structure of the composite amorphous fiber is structurally characterized. The preparation method is the melt drawing method. The diameter of the amorphous fiber is 35-55um. Carry out in body drawing equipment, vacuum degree is 10 -5 Pa, heating power of power supply is 18-20kW, linear speed of Cu roller is 20-25m / s, feeding speed of master alloy is 30μm / s, and the included angle of roller is about 60°. Stepped DC current annealing was carried out after being prepared into fibers. Embodiments will now be described in detail in conjunction with the accompanying drawings of the present invention. The specific steps for preparing amorphous fibers by the melt drawing method are as follows:

[0032] The master alloy melting and suction casting for melt drawing is carried out on the vacuum magnetron tungsten electric arc...

Embodiment 1

[0041] Example 1. Formation of Co-based amorphous fiber core-shell structure.

[0042] Preparation of Co by the melt-drawing method 68.15 Fe 4.35 Si 12.25 B 13.25 Zr 1 Amorphous fibers, obtained fibers with a diameter of 45 μm, high roundness and smooth surface. Then stepwise DC current annealing was carried out, and the DC current initial amplitude was 40mA (the current density was 3.0×10 7 A / m 2 ), the step is set to 20mA (the current density is 1.5×10 7 A / m 2 ), the annealing time of each step is 0.5min, and it is terminated at 140mA (the current density is 1.05×10 8 A / m 2 ), complete annealing, and perform high-resolution transmission microscopy analysis on the core of the fiber sample. The Co-based amorphous fiber with a core-shell structure obtained in this example has a diameter of 45 μm, a core diameter of 39 μm, and a shell thickness of 6 μm.

Embodiment 2

[0044] Example 2. Formation of Co-based amorphous fiber core-shell structure.

[0045] Preparation of Co by the melt-drawing method 68.15 Fe 4.35 Si 12.25 B 13.25 Zr 2 Amorphous fibers, obtained fibers with a diameter of 45 μm, high roundness and smooth surface. Then stepwise DC current annealing was carried out, and the DC current initial amplitude was 40mA (the current density was 3.0×10 7 A / m 2 ), the step is set to 20mA (the current density is 1.5×10 7 A / m 2 ), the annealing time of each step is 0.5min, and it is terminated at 80mA (the current density is 5×10 7 A / m 2 ), complete annealing, and perform high-resolution transmission microscopy analysis on the core of the fiber sample. The Co-based amorphous fiber with a core-shell structure obtained in this example has a diameter of 45 μm, a core diameter of 35 μm, and a shell thickness of 10 μm.

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Abstract

The invention discloses a method for controlling a Co-based amorphous fiber to form a core-shell structure and application thereof, and belongs to the technical field of functional materials. With themethod, the Co-based amorphous fiber can be of a multiphase composite structure with a nanocrystal core and an amorphous shell layer, and can have better mechanical and giant magneto-impedance properties. According to the method, raw materials are prepared according to the element content of each component in the Co-based amorphous fiber, the Co-based amorphous fiber is prepared by using a melt drawing method, and the Co-based amorphous fiber is subjected to stepping direct current annealing to obtain the amorphous fiber of the core-shell composite structure. The Co-based amorphous fiber withthe core-shell structure can be used for preparing magnetic sensors.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method and application for controlling a Co-based amorphous fiber to form a core-shell structure. Background technique [0002] The microstructure of amorphous fiber is long-range disorder and short-range order, and it has good geometric symmetry, small hysteresis loss and coercive force, negative or near zero magnetostriction coefficient, high magnetic permeability, special The magnetic domain structure and skin effect (SkinEffect) and other characteristics, especially the significant giant magneto-impedance effect (giant magneto-impedance, GMI) at higher frequencies are significantly better than other amorphous ribbons, magnetic films and electrodeposited composite fibers. Type material, so amorphous fiber is more suitable as a new type of sensitive material for GMI magnetic sensor . Multi-phase composite structural fiber refers to the controllable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/04C22F1/10
CPCC22C45/04C22F1/10C22C1/11
Inventor 姜思达孙剑飞付振华曹福洋黄永江
Owner HARBIN INST OF TECH
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