Preparation method of refractory high-entropy alloy powder

Abstract

The invention discloses a preparation method of refractory high-entropy alloy powder. The preparation method comprises the following steps: firstly, preparing a refractory high-entropy alloy cast ingot from 3-7 refractory metal elements and 0-3 light elements by using a vacuum melting method; pulverizing by using a mechanical crushing method; and finally, obtaining the spherical refractory high-entropy alloy powder with the required particle size through a plasma spheroidizing method, wherein the particle size of the powder is 10-200 microns. According to the preparation method, the small-size refractory high-entropy alloy cast ingot can be processed into powder, the process steps are simple, the powder preparation efficiency is high, powder preparation of the high-melting-point alloy can be achieved, and a refractory high-entropy alloy bar does not need to be prepared. The prepared high-entropy alloy powder is controllable in particle size, uniform in component and high in production efficiency.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloy powder preparation, in particular to a method for preparing refractory high-entropy alloy powder. Background technique [0002] In the environment above 600°C, superalloy materials are generally used as metal structural materials. Superalloys have excellent high-temperature strength and are divided into iron-based, nickel-based, cobalt-based and other types. They are mainly used in aerospace, energy and other fields, especially nickel-based superalloys occupy an important position in the entire superalloy field and are widely To manufacture the hottest parts of aviation jet engines and various industrial gas turbines. In 2010, the U.S. Air Force Laboratory publicly reported a new superalloy called refractory high-entropy alloy (Intermetallics 18 (2010) 1758-1765). Refractory high-entropy alloys refer to high-entropy alloys mainly composed of refractory metal elements such as W, Ta, Mo...

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Problems solved by technology

However, since the melting point of most refractory high-entropy alloys is higher than 1800 °C, the gas atomization equipment widely used in the powder-making industry is limited by the use temperature of the crucible and the melting temperature limit, and it is difficult to prepare refractory high-entropy alloy powder; Although the plasma rotating electrode atomization method gets rid of the shackles of the crucible, it requires the production of alloy rods with good toughness and high coaxiality; due to the high melting point and poor fluidity of refractory high-entropy alloys, it is currently difficult to prepare refractory high-entropy alloy rods; The mechanical alloying method requires the raw material to be powder, and the milling efficiency is very low (it takes at least 3-4 days). After long-term ball milling, there are not only many impurities but also the powder output is very low.

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