Porous high-entropy alloy and preparation method thereof

A high-entropy alloy and mechanical alloying technology, applied in the field of porous metal materials, can solve the problems of high melting point, slow diffusion of high-entropy alloy, long preparation time, etc., and achieve excellent comprehensive mechanical properties, energy saving, emission reduction, environmental protection, and pore distribution. uniform effect

Active Publication Date: 2016-06-01
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

However, the dealloying method takes a long time to prepare, and it is difficult to prepare large-sized porous metal materials
[0005] However, the preparation of porous high-entropy alloys is still a major difficulty, and there are few reports on the preparation methods of porous high-entropy alloys.
Because the melting point of high-entropy alloys is generally very high, through the previous discussion, the melt foaming method, infiltration casting method and hollow ball sintering method are difficult to apply, and the dealloying method cannot prepare large-sized porous high-entropy alloys.
Therefore, powder metallurgy solid-phase sintering is required, and high-entropy alloys also have the characteristics of slow diffusion. It is difficult to make high-entropy alloy powder particles tightly bonded by general powder metallurgy sintering methods, it is difficult to obtain good sintering strength, and it is difficult to find

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  • Porous high-entropy alloy and preparation method thereof
  • Porous high-entropy alloy and preparation method thereof
  • Porous high-entropy alloy and preparation method thereof

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preparation example Construction

[0041] A method for preparing a porous high-entropy alloy. The method uses ball-milled atomized high-entropy alloy powder (or high-entropy alloy powder prepared by mechanical alloying) and a sieved pore-forming agent according to the preparation requirements. Proportionate ingredients, after being uniformly mixed by a mixer, sintered with SPS, then put the sintered sample into deionized water for ultrasonic cleaning, remove the pore-forming agent particles, and ventilate and dry to obtain a porous high-entropy alloy material. Described method comprises the steps:

[0042] Step 1. Ball milling of high-entropy alloy powder: use an omnidirectional planetary ball mill to perform ball milling on the atomized high-entropy alloy powder. The ball milling process is carried out under the protection of argon with a ball-to-material ratio of 10:1. Alkane is used as a process control agent, the ball milling speed is 250~300rpm, and the ball milling time is 15~20h;

[0043] Or use an all-...

Embodiment 1

[0050] (1) AlFeCoNiCr high-entropy alloy powder is prepared by mechanical alloying, using an all-round planetary ball mill, the purity of the metal element powder raw materials is higher than 99%, the particle size is 200-325 mesh, and the ball-to-material ratio in the ball milling process is 15:1 , using n-heptane as the process control agent, the ball milling speed is 300rpm, and the ball milling time is 60h.

[0051] (2) Select sodium metaaluminate (NaAlO2) with a particle size of 40-60 mesh (250-425 μm) as the pore-forming agent, and use a standard sieve to sieve the pore-forming agent particles.

[0052] (3) Sodium metaaluminate is mixed according to the volume of 45%, 55% and 65% of the total volume, and is fully and uniformly mixed with a V-shaped mixer, and the mixing time is 30 minutes.

[0053] (4) The homogeneously mixed high-entropy alloy-pore-forming agent mixed powder was sintered by SPS, the sintering temperature was 1100°C, graphite mold was used, the sintering...

Embodiment 2

[0056] (1) AlFeCoNiCr high-entropy alloy powder is prepared by mechanical alloying, using an all-round planetary ball mill, the purity of the metal element powder raw materials is higher than 99%, the particle size is 200-325 mesh, and the ball-to-material ratio in the ball milling process is 15:1 , using n-heptane as the process control agent, the ball milling speed is 300rpm, and the ball milling time is 60h.

[0057] (2) Select sodium metaaluminate (NaAlO2) with a particle size of 60-80 mesh (180-250 μm) as the pore-forming agent, and use a standard sieve to sieve the pore-forming agent particles.

[0058] (3) Sodium metaaluminate is mixed according to the volume of 45%, 55% and 65% of the total volume, and is fully and uniformly mixed with a V-shaped mixer, and the mixing time is 30 minutes.

[0059] (4) The homogeneously mixed high-entropy alloy-pore-forming agent mixed powder was sintered by SPS, the sintering temperature was 1100°C, graphite mold was used, the sintering...

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Abstract

The invention discloses porous high-entropy alloy and a preparation method thereof and belongs to the field of porous foam metal. The preparation method of the porous high-entropy alloy specifically comprises the steps that high-entropy alloy powder and screened pore-forming agents are mixed proportionally according to the requirements for the porosity and the pore size, and the high-entropy alloy powder and the screened pore-forming agents are sintered through spark plasma sintering (SPS) directly after being uniformly mixed by a blender mixer; after sintering is completed, a sintered sample is put into deionized water to be subjected to ultrasonic cleaning, and particles of the pore-forming agents are removed by using the characteristic that the pore-forming agents are soluble in water; and finally the porous high-entropy alloy is obtained. The preparation method is simple in process, particularly, the preparation time is shortened greatly through the SPS method, and the efficiency is improved. The prepared porous high-entropy alloy has the characteristics of being high in porosity, uniform in pore size distribution, controllable in porosity and pore size and the like and has potential application prospects in the fields of biology, petroleum, metallurgy, chemical industry and the like.

Description

technical field [0001] The invention belongs to the field of porous metal materials, and specifically relates to a porous high-entropy alloy and a preparation method thereof. The method can prepare a porous high-entropy alloy material with an open-pore structure with controllable porosity and pore size and uniform pore size distribution. Background technique [0002] High-entropy alloys (High Entropy Alloys, HEAs) are a kind of at least five components (also defined as four components), the components are equiatomic ratio or approximate equiatomic ratio and the content of each component is 5% Alloy systems between ~35%. Therefore, no element can occupy more than 50%, which is an alloy system composed of multiple elements. Although there are many components, the structure of the obtained high-entropy alloy is very simple, generally a simple face-centered cubic (FCC) or body-centered cubic (BCC) solid solution, and has many excellent properties such as mechanical properties, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C1/05C22C30/00
CPCB22F2999/00C22C1/05C22C1/08C22C30/00B22F3/10B22F2202/13
Inventor 刘雄军吕宗阳王辉贾蓓吴渊吕昭平
Owner UNIV OF SCI & TECH BEIJING
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