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Cobalt-based bulk amorphous alloy and preparation method thereof

An amorphous alloy, cobalt-based technology, applied in the field of cobalt-based bulk amorphous alloy and its preparation, can solve the problem of increasing raw material and preparation costs, hindering the large-scale application and development of Co-based bulk amorphous alloy, and unfavorable research and development. Develop ultra-high-strength metal materials and other issues to achieve high thermal stability

Active Publication Date: 2019-02-19
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, it can be found that the currently reported Co-based bulk amorphous alloys often contain noble metals such as Ta and Nb and rare earth elements, which greatly increases the cost of raw materials and preparation, which seriously hinders the scale-up of Co-based bulk amorphous alloys. Application and Development
At the same time, most Co-based bulk amorphous alloys contain a variety of components, which makes the preparation process and process of amorphous alloys too complicated, and is not conducive to the research and development of ultra-high-strength metal materials as a model system.

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  • Cobalt-based bulk amorphous alloy and preparation method thereof
  • Cobalt-based bulk amorphous alloy and preparation method thereof
  • Cobalt-based bulk amorphous alloy and preparation method thereof

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preparation example Construction

[0051] The present application also provides a method for preparing the cobalt-based bulk amorphous alloy, comprising the following steps:

[0052] A) batching is carried out according to the atomic percentage of each element of the cobalt-based bulk amorphous alloy shown in formula (I);

[0053] B) melting the raw materials obtained in step A) to obtain a master alloy ingot;

[0054] C) performing water-cooled copper mold suction casting on the master alloy ingot, rapid solidification and cooling to obtain a cobalt-based bulk amorphous alloy;

[0055] co a W b B c (I);

[0056] Wherein, a, b and c are the atomic percentages of corresponding elements;

[0057] a=54-70; b=15-30; c=12-19; ​​a+b+c=100.

[0058] In the process of preparing the cobalt-based bulk amorphous alloy, batching is carried out first, and the batching process is carried out in a manner well known to those skilled in the art, and there is no special limitation here. In a specific embodiment, the mass...

Embodiment 1 3

[0064] Example 1 Ternary Co 63 W 21 B 16 Preparation of bulk amorphous alloys

[0065] Step 1: Ingredients

[0066] According to Co a W b B c The target composition of the ternary bulk amorphous alloy takes three kinds of raw materials Co, W and B, and the metal raw materials need to polish the surface oxide skin, and the mass percentage purity of each raw material needs to be higher than 99.9%; the Co a W b B c Among them, Co is metal cobalt Co, W is metal tungsten W, B is elemental boron B, a, b, and c are atomic percentages, a=63, b=21, c=16, and a+b+c=100;

[0067] Step 2: Melting into alloy ingots and preparing Co in a vacuum electric arc furnace 63 W 21 B 16 bulk amorphous alloy

[0068] Put the prepared raw materials into the vacuum electric arc furnace, and then evacuate to 4×10 -3 Below Pa, fill in 0.05MPa argon again, and continue vacuuming to 4×10 -3 Below Pa, refill with 0.2MPa argon; under the protection of an argon atmosphere with a mass percentage ...

Embodiment 2

[0074] Example 2Co 59 W 26 B 15 Preparation of bulk amorphous alloys

[0075] Step 1: Ingredients

[0076] According to Co a W b B c The target composition of the ternary bulk amorphous alloy takes three kinds of raw materials Co, W and B, and the metal raw materials need to polish the surface oxide skin, and the mass percentage purity of each raw material needs to be higher than 99.9%; the Co a W b B c Among them, Co is metal cobalt Co, W is metal tungsten W, B is elemental boron B, a, b, and c are atomic percentages, where a=59, b=26, c=15, and a+b+c= 100;

[0077] Step 2: Melting alloy ingots and Co in a vacuum electric arc furnace 59 W 26 B 15 Bulk amorphous alloy Put the prepared raw materials into the vacuum electric arc furnace, and then vacuumize to 4×10 -3 Below Pa, fill in 0.05MPa argon again, and continue vacuuming to 4×10 - 3 Below Pa, refill with 0.2MPa argon; under the protection of an argon atmosphere with a mass percentage of high purity of 99.99...

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Abstract

The invention provides a cobalt-based bulk amorphous alloy as shown in the formula CoaWbBc, wherein a, b and c are the atomic percents of corresponding elements; and a=54-70, b=15-30, c=12-19, and a+b+c=100. The cobalt-based bulk amorphous alloy provided by the invention has the superhigh strength, superhigh hardness, extremely high heat stability, the high amorphous forming ability and the good corrosion resistance and soft magnetic property. Experiment results show that the strength of the cobalt-based bulk amorphous alloy is 5500 MPa-6300 MPa, the glass transition temperature Tg is 844 K-960 K, and the corrosion current density in a 3.5 wt% NaCl solution is as low as 8 muA / cm<2>.

Description

technical field [0001] The invention relates to the technical field of amorphous alloys, in particular to a cobalt-based bulk amorphous alloy and a preparation method thereof. Background technique [0002] Bulk amorphous alloys are amorphous alloys whose three-dimensional dimensions are greater than 1 mm. Bulk amorphous alloy has a unique structure of long-range disorder and short-range order due to its atomic arrangement, so it has extremely high strength and hardness, excellent corrosion resistance and wear resistance, etc. , information and other fields show good application prospects. [0003] Among the many systems of bulk amorphous alloys, the mechanical properties of cobalt-based bulk amorphous alloys are particularly outstanding. In 2003, Inoue and others from Tohoku University in Japan developed a Co-Fe-Ta-B bulk amorphous alloy with a fracture strength of 5.2GPa, creating the world's highest strength record for metal bulk materials at that time (Inoue A, Shen B L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/04
CPCC22C45/04C22C1/11
Inventor 郭胜锋赖利民丁凯露
Owner SOUTHWEST UNIV
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