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High-hardness cobalt-based metal glass and preparation method thereof

A base metal, high hardness technology, applied in the field of cobalt-based amorphous structural materials, can solve problems such as poor vitrification forming ability, and achieve the effects of improved hardness value, superior comprehensive performance, and improved corrosion resistance

Inactive Publication Date: 2021-03-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a high-hardness cobalt-based metallic glass and its preparation method, the purpose is to improve the corrosion resistance and wear resistance of metal cobalt and its compounds, improve the traditional cobalt-based amorphous Disadvantages of poor vitrification forming ability of alloy

Method used

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  • High-hardness cobalt-based metal glass and preparation method thereof
  • High-hardness cobalt-based metal glass and preparation method thereof
  • High-hardness cobalt-based metal glass and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] prepared by the single-roll stripping method (Co 0.75 Cr 0.125 Mo 0.125 ) 75 B 25 , (Co 0.75 Cr 0.125 Mo 0.125 ) 73 B 27 , (Co 0.75 Cr 0.125 Mo 0.125 ) 71 B 29 , (Co 0.75 Cr 0.125 Mo 0.125 ) 69 B 31 Amorphous alloy strips, the specific steps are as follows:

[0037] (1) Convert the atomic percentage in the alloy expression to mass percentage for batching. Firstly, all kinds of high-purity metals and metalloids (purity not less than 99.9wt%) required are placed in alcohol, and ultrasonically cleaned in an ultrasonic cleaning machine. Then take by weighing Co, Mo, Cr, B raw material of corresponding quality stand-by;

[0038] (2) Place the weighed raw materials of corresponding quality in the crucible of the vacuum arc melting furnace, and when the vacuum reaches 2.5×10-3Pa, fill in argon as a protective atmosphere, and fill the protective gas until the pressure in the melting furnace is -0.5Pa. Heating with an electric arc until the alloy is complet...

Embodiment 2

[0041] Prepared by spray casting (Co 0.75 Cr 0.125 Mo 0.125 ) 75 B 25 , (Co 0.75 Cr 0.125 Mo 0.125 ) 73 B 27 , (Co 0.75 Cr 0.125 Mo 0.125 ) 71 B 29 , (Co 0.75 Cr 0.125 Mo 0.125 ) 69 B 31 Amorphous alloy rods, the specific steps are as follows:

[0042] (1) Convert the atomic percentage in the alloy expression to mass percentage for batching. Firstly, all kinds of high-purity metals and metalloids (purity not less than 99.9wt%) required are placed in alcohol, and ultrasonically cleaned in an ultrasonic cleaning machine. Then take by weighing Co, Mo, Cr, B raw material of corresponding quality stand-by;

[0043] (2) Place the weighed raw materials of corresponding quality in the crucible of the vacuum arc melting furnace, and when the vacuum reaches 2.5×10-3Pa, fill in argon as a protective atmosphere, and fill the protective gas until the pressure in the melting furnace is -0.5Pa. Heating with an electric arc until the alloy is completely melted into a uni...

Embodiment 3

[0046] Sample characterization experiment: The prepared amorphous alloy strips and rods are subjected to a series of tests to determine whether the samples are amorphous alloys. The details are as follows,

[0047] (1) Amorphous structure characterization: For alloy strip samples, cut 3-5 strips with a length of about 1 cm, and fix them on the single crystal silicon sample stage with double-sided adhesive with the free surface upward. For bar experiments, First use a metallographic cutting machine to cut out a metal with a thickness of 2mm, polish the cross-section of the bar with No. 2000 water sandpaper, and then clean it with alcohol. Place the polished side up on the single crystal silicon sample stage. The structure of the sample was detected by X-ray diffractometer (XRD), and the XRD diffraction peak was a single diffuse steamed bread peak. figure 1 It is a strip sample XRD, which shows a broad diffraction peak, and there is no obvious crystal precipitation peak. (Co ...

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Abstract

The invention discloses high-hardness cobalt-based metal glass and a preparation method thereof. The preparation method comprises the steps of conducting burdening according to a cobalt-based metal glass alloy component expression, using a vacuum smelting furnace for smelting the burdened raw materials multiple times to form a master alloy ingot, and cutting the prepared master alloy ingot into small blocks; and after ultrasonically cleaning, melting again under the protection of inert gas, and preparing into a sample. According to the technical scheme, the hardness of the cobalt-based amorphous alloy is improved, the vitrification forming capacity of the cobalt-based amorphous alloy is improved, precious metal elements are not added, the production cost is reduced, and the method is easyto operate, easy to prepare, green and environmentally friendly, and suitable for the production process of large-scale products.

Description

technical field [0001] The invention belongs to the field of cobalt-based amorphous structure materials, and more specifically relates to a high-strength metallic glass and a preparation method thereof. Background technique [0002] Amorphous alloy is an alloy formed by ultra-rapid cooling and solidification of high-temperature molten alloy, and rapid cooling to room temperature. Due to the extremely fast cooling rate when the alloy is solidified, the atoms inside the alloy have no time to arrange and crystallize in an orderly manner and present a structure of long-range disorder and short-range order, which makes amorphous alloys have many excellent properties compared with crystalline alloys, such as High strength and hardness, high corrosion resistance, excellent magnetic properties, etc. Due to the unique atomic structure and excellent performance of amorphous alloys, amorphous alloys have become the focus of research and development by researchers at home and abroad, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/04B22D11/06C22F1/10C22F1/02
CPCC22C45/04B22D11/001B22D11/0611C22F1/10C22F1/02C22C1/11
Inventor 朱胜利刘丛井上明久崔振铎
Owner TIANJIN UNIV
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