Method of rapidly preparing NbMoTaW refractory high-entropy alloy material

Abstract

The invention relates to a method of rapidly preparing a NbMoTaW refractory high-entropy alloy material, in order to solve the problem that the refractory high-entropy alloy material can not be prepared in a large quantity efficiently by a traditional smelting method used at present easily. The method comprises the steps that Nb2O5, MoO3, Ta2O5, WO3 and Al powder are mixed uniformly, and a mixtureis dried and then is pressed to be a billet, thus a thermite precast block with the relative density being 50% is obtained; the obtained thermite precast block is put in a crucible and the crucible is put in reaction equipment; the reaction equipment is subjected to vacuumizing and is filled with protective gas, the thermite precast block is ignited, and combustion synthesis reaction is initiated; and after the reaction is completed, a material layered vertically is obtained, an upper layer is a ceramic layer, a lower layer is a NbMoTaW refractory high-entropy alloy, and the ceramic layer atthe upper layer of a sample is stripped, thus a NbMoTaW refractory high-entropy alloy block is obtained. The method has the advantages that the method is rapid and efficient, a preparation process ispollution-free, the energy consumption is low, and the relative density of the prepared NbMoTaW refractory high-entropy alloy block is greater than 95%.

Description

Technical field: [0001] The invention relates to the field of preparation of refractory high-entropy alloy materials, in particular to a method for rapidly preparing NbMoTaW refractory high-entropy alloy materials. Background technique: [0002] Nb-Mo-Ta-W-V series refractory high-entropy alloys have excellent high-temperature phase stability and high-temperature softening resistance, so they are regarded as potential structural materials for aerospace industry. However, the current development of refractory high-entropy alloys is limited by their preparation technology. The main reason is that the commonly used induction melting technology and arc melting technology have obvious limitations for the preparation of refractory high-entropy alloys: [0003] (1) The melting point of the constituent elements of the refractory high-entropy alloy is high, which requires high performance of the preparation equipment and consumes a large amount of energy; (2) The purity of the raw ma...

AI Technical Summary

Problems solved by technology

However, the current development of refractory high-entropy alloys is restricted by its preparation technology. The main reason is that the commonly used induction melting technology and arc melting technology have obvious limitations in the preparation of refractory high-entropy alloys:

[0003] (1) The melting point of the constituent elements of the refractory high-entropy alloy is high, which requires high performance of the preparation equipment and consumes a lot of energy; (2) The purity of the raw material is high and the price of the raw material is expensive; (3) The melting point of the alloying elements is different Large, it is easy to cause element volatilization and uneven alloy composition, and the melting technology is difficult; (4) It needs to be smelted repeatedly to ensure the uniformity of the alloy composition, and the preparation cycle is long; (5) High melting point alloy elements are compared at high temperature Lively, prone to oxidation reaction during smelting

Therefore, it is not easy to produce refractory high-entropy alloys efficiently and in large quantities using traditional smelting methods.

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