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Nanometer porous high-entropy alloy microsphere material and preparation method thereof

A high-entropy alloy and nanoporous technology, which is applied in the field of nanoporous high-entropy alloy microsphere materials and their preparation, can solve the problems of high cost of additional materials, no pores or low porosity, and high technical level requirements, and can promote rapid transfer. , Reduce the effect of high-precision control and shorten the process cycle

Active Publication Date: 2019-03-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention solves the problem of complex equipment and high cost in the prior art, high requirements for advanced equipment, precise control of the process, and high technical level of operators, complex overall process, long production cycle, high cost of additional materials, and high energy consumption. Disadvantages of high, low yield, non-porous samples or low porosity

Method used

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  • Nanometer porous high-entropy alloy microsphere material and preparation method thereof
  • Nanometer porous high-entropy alloy microsphere material and preparation method thereof
  • Nanometer porous high-entropy alloy microsphere material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The first step, smelting to prepare the master alloy ingot

[0036] Select high-purity Cu, Au, Pt and Pd metals as raw materials, and the mass purity of the four elements is 99.99wt%; then according to the target composition Cu 97 Au 1 Pt 1 PD 1 The four kinds of metals required to prepare 10g of alloy, the marked composition is the atomic percentage; the mixed metal raw materials are placed in a vacuum electric arc furnace, and the vacuum is evacuated to an air pressure of 3.0×10 -3 Pa; filled with argon, the argon pressure is 3×10 -2 Start arc melting under the condition of MPa, the melting current is 80A, repeat the melting 4 times, each time for 35s, to ensure the uniformity of the alloy structure, and produce Cu after cooling with the furnace 97 Au 1 Pt 1 PD 1 master alloy ingot;

[0037] The second step, preparation of dealloyed precursor microspheres by spray casting

[0038] After grinding and cleaning the master alloy ingot obtained in the previous ste...

Embodiment 2

[0043] The first step, smelting to prepare the master alloy ingot

[0044] Select high-purity Cu, Au, Pt and Pd metals as raw materials, and the mass purity of the four elements is 99.99wt%; then according to the target composition Cu 99.01 Au 0.33 Pt 0.33 PD 0.33 The four kinds of metals required to prepare 10g of alloy, the marked composition is the atomic percentage; the mixed metal raw materials are placed in a vacuum electric arc furnace, and the vacuum is evacuated to an air pressure of 3.0×10 -3 Pa; filled with argon, the argon pressure is 3×10 -2 Start arc melting under the condition of MPa, the melting current is 70A, repeat the melting 5 times, each time for 30s, to ensure the uniformity of the alloy structure, and produce Cu after cooling with the furnace 99.01 Au 0.33 Pt 0.33 PD 0.33 master alloy ingot;

[0045] The second step, preparation of dealloyed precursor microspheres by spray casting

[0046] After grinding and cleaning the master alloy ingot obta...

Embodiment 3

[0051] The first step, smelting to prepare the master alloy ingot

[0052] Select high-purity Cu, Au, Pt and Pd metals as raw materials, and the mass purity of the four elements is 99.99wt%; then according to the target composition Cu 94 Au 2 Pt 2 PD 2 The four kinds of metals required to prepare 10g of alloy, the marked composition is the atomic percentage; the mixed metal raw materials are placed in a vacuum electric arc furnace, and the vacuum is evacuated to an air pressure of 3.0×10 -3 Pa; filled with argon, the argon pressure is 3×10 -2 Start arc melting under the condition of MPa, the melting current is 100A, repeat the melting 3 times, each time for 40s, to ensure the uniformity of the alloy structure, and produce Cu after cooling with the furnace 94 Au 2 Pt 2 PD 2 master alloy ingot;

[0053] The second step, preparation of dealloyed precursor microspheres by spray casting

[0054] After grinding and cleaning the master alloy ingot obtained in the previous st...

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Abstract

The invention discloses a nanometer porous high-entropy alloy microsphere material and a preparation method thereof. The nanometer porous high-entropy alloy microsphere material is a high-entropy alloy with elemental composition of Cu<alpha>Au<beta>Pt<gamma>Pd<eta>, wherein atomic percentages of the elemental composition are that alpha is greater than or equal to 29.55% and less than or equal to 31.78%, beta is greater than or equal to 22.93% and less than or equal to 25.67%, gamma is greater than or equal to 22.23% and less than or equal to 23.46%, and eta is greater than or equal to 19.1% and less than or equal to 24.64%, and the sum of alpha, beta, gamma and eta is 100%; the nanometer porous high-entropy alloy microsphere material has a double-stage porous structure, wherein first-stageholes distributed along a crystal boundary are micrometer holes; second-stage holes in crystal grains are of a nanometer ligament / pore bi-continuous structure; and the specific surface area of the nanometer porous high-entropy alloy microsphere material is 65.34 m<2> / g-73.22 m<2> / g, and the diameter of a microsphere is 35-65 [mu]m. According to the nanometer porous high-entropy alloy microspherematerial and the preparation method thereof, the specific surface area of the nanometer porous high-entropy alloy microsphere material is increased by 249-73220 times compared to the specific surfacearea of a current porous high-entropy alloy material.

Description

technical field [0001] The invention relates to the field of high-entropy alloy materials, in particular to a nanoporous high-entropy alloy microsphere material and a preparation method thereof. Background technique [0002] High-entropy alloy is a new type of alloy material that is composed of four or more main elements in equiatomic ratio or close to equiatomic ratio and forms a solid solution structure. Its thermodynamic high-entropy effect, structural Lattice distortion effect, kinetic hysteresis diffusion effect, and performance cocktail effect make this kind of material have high strength and toughness, excellent corrosion resistance, good thermal stability and excellent fracture resistance that cannot be matched by traditional alloys sex. Porous high-entropy alloys formed by making high-entropy alloys porous have shown excellent performance in catalysis and other fields. Due to the coordination between multiple principal elements, the possible application fields of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/03B22D11/06C23F1/16
CPCB22D11/06C22C1/03C22C30/02C23F1/16
Inventor 王志峰杨联赞闫永辉秦春玲赵维民
Owner HEBEI UNIV OF TECH