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

A high-performance, carbide technology, applied in the field of high-entropy ceramics, can solve the problems of low degree of graphitization, affecting dispersibility, easy oxidation, etc., achieving high chemical reactivity, good sphericity, and solving the effect of high synthesis temperature

Pending Publication Date: 2021-03-09
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degree of graphitization of carbon black is low, and it is easy to be oxidized when the addition amount is large or the reaction temperature is high; Dispersion in the sample
The problem of carbon source limits the sintering process and performance of high-entropy carbide ceramics to a certain extent, and restricts the wider application of high-entropy carbide ceramics. It needs further improvement in carbon source and production process
But its main defect is: (1) the degree of graphitization of carbon black is low, when adding a large amount or reaction temperature is high, it is easy to oxidize; (2) carbon black is light, and it is easy to float in the process of wet grinding The surface of the matrix affects its dispersion in the sample

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high-performance (TiTaHfZrNb) C high-entropy carbide ceramic, comprising the following raw materials in parts by weight: 1 part of hafnium oxide micropowder, 1 part of titanium oxide micropowder, 1 part of tantalum pentoxide micropowder, 1 part of zirconia micropowder, niobium pentoxide 1 part of fine powder, 5 parts of graphite microspheres.

[0022] The purity of the hafnium oxide micropowder, titanium oxide micropowder, tantalum pentoxide micropowder, zirconia micropowder and niobium pentoxide micropowder is ≥99%, and the particle size is ≤5 μm; the preparation method of graphite microspheres includes the following steps, S1: glucose, Put ionic water, sodium polyacrylate and metal catalyst into the reactor, raise the temperature to 180°C and keep it warm for 4 hours to obtain catalyst-loaded carbon microspheres; S2: Put the catalyst-loaded carbon microspheres under the condition of 900°C Graphite microspheres were obtained after heat treatment for 1 h.

[0023] Th...

Embodiment 2

[0028] A high-performance (TiTaHfZrNb) C high-entropy carbide ceramic, comprising the following raw materials in parts by weight: 1 part of hafnium oxide micropowder, 1 part of titanium oxide micropowder, 1 part of tantalum pentoxide micropowder, 1 part of zirconia micropowder, niobium pentoxide 1 part of fine powder, 5 parts of graphite microspheres.

[0029] The purity of the hafnium oxide micropowder, titanium oxide micropowder, tantalum pentoxide micropowder, zirconia micropowder and niobium pentoxide micropowder is ≥99%, and the particle size is ≤5 μm; the preparation method of graphite microspheres includes the following steps, S1: glucose, Put ionic water, sodium polyacrylate and metal catalyst into the reactor, raise the temperature to 180°C and keep it warm for 6 hours to obtain catalyst-loaded carbon microspheres; S2: Put the catalyst-loaded carbon microspheres under the condition of 1000°C Graphite microspheres were obtained after heat treatment for 2 h.

[0030] T...

Embodiment 3

[0035] A high-performance (TiTaHfZrNb) C high-entropy carbide ceramic, comprising the following raw materials in parts by weight: 1 part of hafnium oxide micropowder, 2 parts of titanium oxide micropowder, 1 part of tantalum pentoxide micropowder, 1 part of zirconia micropowder, niobium pentoxide 2 parts of fine powder, 5 parts of graphite microspheres.

[0036] The purity of the hafnium oxide micropowder, titanium oxide micropowder, tantalum pentoxide micropowder, zirconia micropowder and niobium pentoxide micropowder is ≥99%, and the particle size is ≤5 μm; the preparation method of graphite microspheres comprises the following step S1: glucose, deionized Put water, sodium polyacrylate and metal catalyst into the reactor, raise the temperature to 180°C and keep it warm for 8 hours to obtain catalyst-loaded carbon microspheres; S2: heat-treat the catalyst-loaded carbon microspheres at 1200°C under an inert atmosphere After 3h, graphite microspheres were obtained.

[0037] Th...

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Abstract

The invention discloses high-performance (TiTaHfZrNb) C high-entropy carbide ceramic and a preparation method thereof, and belongs to the technical field of high-entropy ceramic. The high-performance(TiTaHfZrNb) C high-entropy carbide ceramic comprises the following raw materials in parts by weight: 1-2 parts of hafnium oxide micro powder, 1-2 parts of titanium oxide micro powder, 1-2 parts of tantalum pentoxide micro powder, 1-2 parts of zirconium oxide micro powder and 5-6 parts of graphite microspheres. The graphite microspheres adopted by the invention not only have physical and chemicalproperties similar to those of crystalline flake graphite, but also have good sphericity, fluidity and dispersibility, and in addition, the specific surface area of the graphite microspheres is far larger than that of the crystalline flake graphite, so that the graphite microspheres have higher chemical reaction activity. Compared with carbon black which is easy to float on the surface of a matrix, the mass of the graphite microspheres per unit volume is much higher than that of the carbon black, and the graphite microspheres are easier to disperse in the matrix. Therefore, the high-entropy carbide ceramic is prepared from the graphite microspheres through a carbothermic reduction reaction mechanism, and the problems of high synthesis temperature, large grain development and the like of high-entropy carbide are effectively solved.

Description

technical field [0001] The invention relates to the technical field of high-entropy ceramics, in particular to a high-performance (TiTaHfZrNb)C high-entropy carbide ceramic and a preparation method thereof. Background technique [0002] High-entropy carbides have excellent mechanical properties, corrosion resistance, radiation resistance and friction and wear properties, and have broad application prospects in aerospace, machinery, metallurgy and other fields. Compared with other preparation methods, the oxide carbothermal reduction method requires a lower synthesis temperature, and the prepared ceramics have a small grain size and excellent mechanical properties. The basic principle is: under high temperature conditions, the carbon source is used as the reducing agent to undergo a replacement reaction with the metal oxide and then calcined to prepare high-entropy carbide ceramics. At present, the carbon sources for the preparation of high-entropy carbide ceramics by carbot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/645
CPCC04B35/5607C04B35/622C04B35/645C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/6567
Inventor 李赛赛夏晓宇李明晖陈若愚常兵
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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