A kind of preparation method of multi-element refractory alloy spherical powder

Abstract

The invention discloses a method for preparing a refractory alloy spherical powder with multi-component complex components, which comprises the following steps: mechanically ball milling refractory metal hydride powder to a particle size of 1-5 μm; The refractory metal simple substance powder is used as the refractory alloy raw material powder, and the solvent and the binder are added to mix to obtain a slurry, which is granulated to obtain a spherical powder with a particle size of 15-70 μm, and the spherical powder is placed in the plasma spheroidization system In the powder device, the spheroidization is carried out under the mixed atmosphere of argon and hydrogen, that is, the refractory alloy spherical powder with multiple components and complex components; the refractory alloy raw material is selected from chromium source, tungsten source, molybdenum source, tantalum source, niobium source source, hafnium source, vanadium source, titanium source, zirconium source at least three. The process of the invention is simple and controllable, and the refractory alloy spherical powder with multi-component complex components has uniform composition, compact structure, smooth surface, high sphericity, low impurity content and controllable particle size distribution.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a preparation method of multi-component refractory alloy spherical powder. Background technique [0002] Refractory metals composed of tungsten, molybdenum, tantalum, niobium, hafnium, vanadium, titanium, zirconium, chromium and other high melting point elements are widely used in aerospace and other fields. With the rapid development of aerospace industry, high temperature refractory metal materials Refractory alloys are required to have higher high-temperature strength, better high-temperature stability and oxidation resistance, etc., and single-element refractory metals or simple-component refractory alloys are difficult to meet the requirements. In recent years, complex composition refractory alloys composed of various refractory elements (such as complex composition refractory high-entropy alloys composed of various main elements such as WMoTaNbV, HfNbTa...

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Problems solved by technology

[0004] At present, the preparation of spherical pre-alloyed powder mainly adopts methods such as gas atomization, water atomization, and rotating electrode atomization. Due to the high melting point and fast heat conduction of refractory alloys, it is very difficult to prepare by conventional atomization methods.

Mechanical ball milling method and chemical reaction synthesis method can be used to prepare refractory alloy powder, but the prepared powder has irregular shape, poor fluidity and high impurity content

For example, the patent [CN201811183559.7] of Tang Yu et al. of the National University of Defense Technology discloses a method for preparing refractory alloy powder by long-time high-energy ball milling, but the shape of the prepared powder is irregular and the impurity content is high, which is difficult to meet the requirements of increasing Material manufacturing, thermal spraying, injection molding and other forming technology requirements

[0005] Plasma spheroidization technology generates 8000-10000°C high temperature through plasma, which can quickly melt and spheroidize the granular material, so that it can be used for the preparation of high-temperature refractory alloy spherical powder, such as the patent of Yang Kun et al. of Northwest Nonferrous Metals Research Institute [ CN201711342397.2] discloses a technology for preparing refractory metal powder by adding binder to granulate, then pre-sintering powder aggregates and then combining plasma treatment. This method can be used for the preparation of spherical powder of refractory metal, but its It only involves refractory metal powders with simple components such as tungsten and tungsten alloys, molybdenum and molybdenum alloys, tantalum and tantalum alloys. At the same time, it needs to go through a pre-sintering process to remove the binder in the prefabricated pellets. This pre-sintering process is not only easy Cause powder agglomeration, affect the powder feeding stability and efficiency of plasma treatment, and will greatly increase the process cost

Patent [CN201711309760.0] discloses a technology for preparing refractory metal powder by plasma treatment after ball milling of single metal raw materials, but the quality of metal powder prepared by this method depends on the complex ball milling process of process control, and it is difficult to stabilize mass production

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