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High heat stability block ferromagnetic metal glas synthetic method

A high thermal stability, metallic glass technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of high cost, achieve the effect of convenient operation, reasonable composition design, and cost reduction

Inactive Publication Date: 2004-12-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of bulk metallic glass, expensive high-purity metal raw materials are often used to reduce the heterogeneous nucleation inside and obtain bulk metallic glass, but the cost is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The ingredient is Co 40 Fe 20 hf 6 Ti 2 Mo 3 B 29 For the alloy, industrial pure Co, Fe, Hf, Ti, Mo and Co-B master alloy are selected, and the industrial purity is 98.5-99.9% (99.9% in this embodiment). The purity of titanium is 99.9%, and the master alloy is obtained by arc melting, at 10 -5 Induction heating to 1400 ℃ under Pa vacuum, suction casting into a copper mold with a diameter of 1.5mm, and a cooling rate of 10 2 K / S, forming a bulk ferromagnetic metallic glass with a diameter of 1.5mm.

[0017] Using a high-temperature DSC thermal analyzer, with a heating rate of 20K / MIN, the crystallization temperature Tx was measured to be 720 °C, and complete crystallization can occur only after heat treatment above 1000 °C. Measured with a vibrating sample magnetometer, the saturation magnetization in the quenched state is: 43 emu / g, and the coercive force: 0.5 A / m.

Embodiment 2

[0019] The difference from Example 1 is that:

[0020] The ingredient is Co 40 Fe 20 hf 6 Ti 2 V 3 B 29 The alloy is obtained by arc melting to obtain the master alloy, and then the induction heating copper mold is used to form a bulk metallic glass with a diameter of 1.5mm; the induction heating temperature is 1350 ℃, and the vacuum degree is 10 -5 Pa.

[0021] Using a high temperature DSC thermal analyzer, with a heating rate of 20K / MIN, the crystallization temperature Tx was measured to be 677°C. Measured with a vibrating sample magnetometer, the quenched saturation magnetization was 45 emu / g, and the coercivity was 0.5 A / m.

Embodiment 3

[0023] The difference from Example 1 is that:

[0024] The ingredient is Co 40 Fe 22 hf 3 Ti 6 Mo 3 B 26 The alloy is obtained by arc melting to obtain the master alloy, and then the induction heating copper mold is used to form a bulk metallic glass with a diameter of 1.5mm; the induction heating temperature is 1550 ℃, and the vacuum degree is 10 -4 pa, the cooling rate is 10 3 K / S.

[0025] Using a high temperature DSC thermal analyzer, with a heating rate of 20K / MIN, the crystallization temperature Tx was measured to be 635°C.

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Abstract

This invention relates to high thermally stable ferromagnetic metal glass blocks and their synthesis. The constituent of the said blocks comprises Co 35 - 45 at%, Fe 12 - 35 at%, Hf 2 - 10 at%, Mo 0 - 8 at%, Ti 2 - 8 at%, B 22 - 35 at%, and V 0 - 3 at%. The blocks can be prepared in copper molds, with excellent amorphization at >650 deg.C and the constituent designed more reasonable than the present materials, and used widely at higher temperature.

Description

technical field [0001] The invention relates to a ferromagnetic metallic glass and a preparation technology, in particular to a block ferromagnetic metallic glass with high thermal stability and a synthesis method. technical background [0002] Ferromagnetic metallic glass is widely used as a soft magnetic material in many fields such as electronics, electric power and national defense due to its low coercivity and high magnetic permeability. The traditional metallic glass is prepared by rapid solidification method to inhibit the nucleation and growth process during the solidification process to obtain an amorphous structure, which is generally a very thin strip with a thickness of about 20-50 microns. Rewinding of metallic glass strips into electronic components or transformers of various sizes and shapes. Since it can only be made into very thin strips, its range of use is greatly limited. [0003] During the solidification process, metal materials must undergo a process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/04H01F1/153
Inventor 孙文声张海峰丁炳哲胡壮麟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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