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High heat stability block ferromagnetic metal glass 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, wide application range, and reasonable composition design

Inactive Publication Date: 2006-05-17
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] Composition is Co 40 Fe 20 Hf 6 Ti 2 Mo 3 B 29 For the alloy, industrially pure Co, Fe, Hf, Ti, Mo and Co-B master alloys are selected, and the industrial purity is 98.5-99.9% (in this example, 99.9%). The purity of titanium is 99.9%, and the master alloy is obtained by arc smelting. -5 Under Pa vacuum degree, use induction heating to 1400℃, 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, at a heating rate of 20K / MIN, the crystallization temperature Tx is measured to be 720℃, and the heat treatment above 1000℃ can fully crystallize. Measured with a vibrating sample magnetometer, the quenched saturation magnetization is 43emu / g, and the coercivity is 0.5A / m.

Embodiment 2

[0019] The difference from Example 1 lies in:

[0020] Composition is Co 40 Fe 20 Hf 6 Ti 2 V 3 B 29 The alloy is smelted by an electric arc to obtain a master alloy, and then an induction heating copper mold is used for suction casting 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, the crystallization temperature Tx was measured to be 677°C at a heating rate of 20K / MIN. Measured with a vibrating sample magnetometer, the quenched saturation magnetization is 45emu / g, and the coercivity is 0.5A / m.

Embodiment 3

[0023] The difference from Example 1 lies in:

[0024] Composition is Co 40 Fe 22 Hf 3 Ti 6 Mo 3 B 26 The alloy is smelted by electric arc to obtain a master alloy, and then an induction heating copper mold is used for suction casting 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, cooling rate is 10 3 K / S.

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

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Abstract

The invention relates to ferromagnetic metallic glass and its preparation technology, in particular to a high thermal stability bulk ferromagnetic metallic glass and its synthesis method. In terms of atomic percentage, it consists of the following elements: Co: 35-45%, Fe: 12-35%, Hf: 2-10%, Mo: 0-8%, Ti: 2-8%, B: 22-35% %, V: 0-3%. The present invention can prepare bulk metallic glass under the condition of copper mold casting. Compared with the ferromagnetic bulk metallic glass in the prior art, its composition design is reasonable, and it has good amorphous forming ability. The crystallization temperature is higher than 650°C. It can be used at higher temperatures and has a wide range of applications.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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