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Preparing method of refractory high-entropy alloy spherical powder

A high-entropy alloy and spherical powder technology, which is applied in metal processing equipment, melt spraying, metal material coating technology, etc., can solve the problems of high melting point of refractory high-entropy alloy, difficult preparation by atomization method, and long preparation process. , to achieve the effect of good fluidity, high sphericity and short process flow

Inactive Publication Date: 2018-06-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, methods such as inert gas atomization and water atomization are usually used to prepare spherical alloy powders, but due to the high melting point of refractory high-entropy alloys, such atomization methods are very difficult to prepare
Li Dichen from Xi'an Jiaotong University invented a method for preparing refractory high-entropy alloy spherical powders by means of rotating

Method used

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  • Preparing method of refractory high-entropy alloy spherical powder
  • Preparing method of refractory high-entropy alloy spherical powder
  • Preparing method of refractory high-entropy alloy spherical powder

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Embodiment 1

[0030] A preparation method of W, Mo, Ta, Nb refractory high-entropy alloy spherical powder, comprising the following steps:

[0031] (1) Use 99.9% pure tungsten powder, molybdenum powder, tantalum powder, and niobium powder as high-entropy alloy raw materials, weigh each raw material according to the atomic percentage of 25%, and the total mass is 100g, and then add the high-entropy alloy raw material to the hard Perform ball milling in an alloy tank to obtain mechanically alloyed alloy powders. During ball milling, control the ball milling time to not less than 40 hours, rotate at a speed of 300r / min, and have a ball-to-material ratio of 10:1. Prevent cold welding phenomenon;

[0032] (2) Take the alloy powder obtained in step (1) out of the vacuum glove box and sieve it through a 200-mesh sieve. When sieving, ensure that the argon gas in the box is filled to normal pressure to prevent the alloy powder from being oxidation;

[0033] (3) Place the sieved powder obtained in ...

Embodiment 2

[0036] A kind of preparation method of Nb, Mo, Cr, Ti refractory high-entropy alloy spherical powder, comprises the following steps:

[0037] (1) Use 99.9% pure niobium powder, molybdenum powder, chromium powder and titanium powder as high-entropy alloy raw materials, weigh each raw material according to the atomic percentage of 25%, and the total mass is 100g, and then add high-entropy alloy raw materials to the hard Perform ball milling in an alloy tank to obtain mechanically alloyed alloy powders. During ball milling, control the ball milling time for not less than 24 hours, rotate at a speed of 250r / min, and have a ball-to-material ratio of 15:1. Prevent cold welding phenomenon;

[0038](2) Take the alloy powder obtained in step (1) out of the vacuum glove box and pass through a 325-mesh screen to obtain an alloy powder smaller than 45 microns. When sieving, the box must be filled with argon to normal pressure to prevent the alloy The powder is oxidized during the extract...

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Abstract

The invention discloses a preparing method of refractory high-entropy alloy spherical powder. The method comprises following steps: firstly, a high-entropy alloy raw material is treated through a mechanical alloying method to obtain pre-alloying powder, and the powder is subject to vacuum sieving and then is stored under the vacuum environment; secondly, the pre-alloying powder obtained after vacuum sieving in the first step is placed in a plasma spheroidizing device to be subject to spheroidizing under the argon protection, and the refractory high-entropy alloy spherical powder is obtained.The preparing method is short in process flow, simple in process, lower in energy consumption and suitable for large-scale industrial production. The prepared refractory high-entropy alloy spherical powder has the beneficial effects of being high in sphericity degree, good in surface smoothness, uniform in granularity distribution, good in liquidity, uniform in component and the like and is suitable for the field of additive manufacturing, hot spraying and the like.

Description

technical field [0001] The invention belongs to the field of spherical metal powder materials, and in particular relates to a preparation method of high-entropy alloy spherical powder. Background technique [0002] High-entropy alloys are a new class of alloy materials that have emerged in recent years and are alloyed by four or more components in an equimolar or nearly equimolar ratio combination. Due to the strong high-entropy effect and lattice distortion effect, these materials And diffusion hysteresis effect, it has good thermal stability, low dislocation mobility and diffusion coefficient, so it has high strength, hardness and a series of special electrical, chemical and physical properties. Especially refractory high-entropy alloys mainly composed of refractory components (such as tungsten, molybdenum, tantalum, niobium, etc.), due to their excellent high-temperature performance and thermal stability, they are very suitable for some extreme environments, such as nucle...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F9/14B33Y70/00C23C4/08
CPCC23C4/08B22F9/04B22F9/14B33Y70/00B22F2998/10B22F2009/041B22F2009/042B22F2009/043B22F1/065
Inventor 刘彬李天琛刘咏徐礼友吴宏周承商
Owner CENT SOUTH UNIV
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