Preparation method of refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure

Abstract

The invention discloses a preparation method of a refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure. The method comprises the following steps of: smelting a refractory high-entropy alloy raw material to obtain an alloy ingot, and preparing refractory high-entropy alloy powder from the alloy ingot by using a plasma rotating electrode atomization method; forming the refractory high-entropy alloy powder into a preset porous skeleton structure through an electron beam or selective laser melting additive manufacturing process; and infiltrating metal copper into the porous skeleton structure by adopting an infiltration process, thereby obtaining the refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure. The structure has the characteristic of spontaneous perspiration, and is suitable for high-temperature parts such as rocket engine nozzle throat inserts, thrust chamber injector panels, missile warhead nose cones and electromagnetic gun tracks. The prepared composite structure has the advantages that the forming process is simple, the porosity can be conveniently designed and adjusted according to actual requirements, the mechanical property is good, high temperature resistance and thermal shock resistance can be achieved, and high practical value is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a method for preparing a refractory high-entropy alloy skeleton-copper self-sweating composite structure. Background technique [0002] As rockets and missile hot-end components are used at higher and higher temperatures, no matter how high the melting point of a single material is, it cannot meet the use requirements. The self-sweating structure simulates the principle of heat dissipation of the human body. It is one of the important components through the gasification of low melting point components at high temperatures, evaporation and removal of heat, so as to keep the overall structure from being damaged. The traditional tungsten-copper self-sweating structure is manufactured by powder metallurgy-infiltration method. The through-porosity of the tungsten skeleton manufactured by powder metallurgy is only 80-90%. Some of them will form closed por...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a method for preparing a refractory high-entropy alloy skeleton-copper self-sweating composite structure, which solves the problem that the traditional tungsten-copper self-sweating structure will form closed cells during the sintering process, reducing the spontaneous sweating cooling process. effect; and solve the problem that the mechanical properties of elemental tungsten are not high, and it is difficult to meet the load-bearing requirements under complex conditions

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