High-performance high-entropy (VNbTaMoW)C carbide ceramic and preparation method thereof

Abstract

The invention belongs to the technical field of high-entropy ceramic, and particularly relates to high-performance high-entropy (VNbTaMoW)C carbide ceramic and a preparation method thereof. The preparation method comprises the steps that vanadium pentoxide micropowder, niobium pentoxide micropowder, tantalum pentoxide micropowder, molybdenum trioxide micropowder, tungsten trioxide micropowder andactivated carbon microspheres are weighed according to designed composition and serve as raw materials; absolute ethyl alcohol is adopted as a medium, ball milling is conducted on the raw materials, and drying is conducted so as to obtain a mixture with uniform components; and hot-press sintering is conducted on the mixture to prepare the high-entropy carbide ceramic. According to the preparationmethod, the activated carbon microspheres are used as a carbon source, so the preparation method has the advantages of low production cost, simple preparation process and the like; the good dispersity, high activity and the like of the carbon microspheres are beneficial for dispersion and reduction reaction of the carbon microspheres in a matrix; and the high-entropy carbide ceramic prepared by using the method has the characteristics of good mechanical property, high density, high purity, low thermal conductivity and the like.

Description

technical field [0001] The invention belongs to the technical field of high-entropy ceramics, in particular to a high-performance (VNbTaMoW)C high-entropy carbide ceramic and a preparation method thereof. Background technique [0002] High-entropy carbides have the characteristics of high hardness, high strength, high wear resistance, high mechanical properties and low thermal conductivity, and have broad application prospects in aerospace, machinery, metallurgy and other fields. At present, people's research on high-entropy is mainly concentrated in the field of alloys, and there are few studies on high-entropy ceramics, which have high thermal conductivity, high melting point, good corrosion resistance, good biocompatibility and good electrical properties. Chemical properties, etc., have great development potential in the fields of ultra-high temperature, biomedicine, and energy. Generally speaking, the commonly used methods for preparing high-entropy carbide ceramics incl...

AI Technical Summary

Problems solved by technology

However, the particle size of flake graphite and amorphous carbon powder is relatively large, and the flake structure of flake graphite and the irregular shape of amorphous carbon powder make it difficult to disperse in the system, thereby affecting the uniformity and density of the product; and During the reaction process of the organic carbon source, the carbon residue rate at different temperatures is different, which makes the carbon content in the system different, which ultimately affects the progress of the carbothermal reduction reaction.