High-entropy carbide nano-powder material with high sphericity degree and high activity as well as preparation method and application of high-entropy carbide nano-powder material

Abstract

The invention belongs to the technical field of high-entropy ceramics, and particularly relates to a high-entropy carbide nano-powder material with high sphericity degree and high activity and a preparation method and application thereof, the chemical formula of the material is XC, X is at least four of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, but Mo and W cannot be contained at the same time; the preparation method comprises the following steps: firstly, preparing high-activity carbon microspheres with high specific surface area, low graphitization degree and high sphericity degree as a carbon source by adopting a hydrothermal carbonization method; then uniformly loading four or more than four transition metal salts containing metal cations with equal molar weight on the surfaces of the carbon microspheres, and carrying out hydrothermal reaction to obtain a high-entropy carbide precursor; and finally carrying out vacuum heat treatment. The high-entropy carbide nano-powder with high sphericity degree and high activity prepared by the method can be widely applied to preparation of high-temperature carbide thermal barrier coatings and carbide-enhanced metal ceramic-based composite materials, the hardness, wear resistance and corrosion resistance of the materials are remarkably improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of high-entropy ceramics, and in particular relates to a high-sphericity and high-activity high-entropy carbide nano-powder material and its preparation method and application. Background technique [0002] The concept of high-entropy alloys breaks the traditional design concept of alloys based on one or two elements. It contains at least four main elements, and the atomic percentage of each constituent element is between 5% and 35%. Since then, researchers have applied the high-entropy design concept to the ceramic field, and developed a series of new ceramic materials such as high-entropy carbides, high-entropy nitrides, high-entropy borides, high-entropy sulfides, and high-entropy silicides. Among them, high-entropy carbide ceramics are expected to be used in components serving in extreme environments such as aerospace engines due to their high melting point, high hardness, low thermal conductivity, excel...

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Problems solved by technology

[0004] publication number is that the patent literature of CN 110330341B discloses a kind of high-purity ultrafine transition metal carbide single phase (Hfx1Nbx3 Tax4Tix2Mx5)C high-entropy ceramic powder preparation method, by combining metal oxide and reducing The mixed powder after carbon powder high-energy ball milling is obtained after vacuum calcination and sieving; however, impurity components will inevitably be introduced during the ball milling process, and the synthesis temperature is as high as 2200 ° C, which will deteriorate the activity of high-entropy carbide ceramic powder and other performance

[0005] The patent document whose publication number is CN113620712A discloses a kind of high-entropy carbide ceramic nanopowder and its preparation method and application, by metal oxide powder (ZrO 2, TiO2, Ta2O5, Nb2O5 and Cr2O3), carbon powder, magnesium powder and NaF powder are pre-mixed and pressed into tablets, and then mixed The high-entropy carbide ceramic nano-powder is obtained by pressing the powder into a protective atmosphere for sintering, washing, pickling and drying; however, due to the direct use of oxide powder materials, the chemically active poles of the prepared high-entropy carbide materials The earth is limited by raw materials; at the same time, this method needs to wash the powder with hydrochloric acid with a concentration of 1-3mol / L for 2-4 hours, which is not conducive to environmental protection and wide application

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