High-entropy carbide nano-powder and preparation method thereof

A nano-powder and carbide technology, which is applied in the fields of carbon compounds, chemical instruments and methods, and inorganic chemistry, can solve the problems of difficult to obtain nano-scale high-entropy carbide powders, and achieve low cost, small particle size, and applicable wide range of effects

Active Publication Date: 2019-08-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-entropy carbide nano-powder and its preparation method, which overcomes the fact that the high-entropy carbide ceramics obtained in the prior art are mainly in blocks, and it is difficult to obtain nano-scale high-entropy carbonization To overcome the defects of powder, the present invention obtains a high-entropy carbide liquid precursor in which the components are uniformly mixed at the molecular level through the solvent-gel reaction between the transition metal salt and the organic carbon source, and is formed by drying and high-temperature heat treatment. Single-phase high-entropy carbide nanopowder

Method used

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  • High-entropy carbide nano-powder and preparation method thereof
  • High-entropy carbide nano-powder and preparation method thereof
  • High-entropy carbide nano-powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 1.89g of titanium tetrachloride, 2.33g of zirconium tetrachloride, 3.20g of hafnium tetrachloride, 2.70g of niobium pentachloride, and 3.58g of tantalum pentachloride into 50g of absolute ethanol, stir to dissolve it completely, Add 3.43g of furfuryl alcohol resin, react in a constant temperature water bath at 60°C for 1 hour, and dry the obtained precursor in an oven at 80°C to obtain a xerogel. Place the dry gel in a graphite furnace under an argon atmosphere for heat treatment at 2000°C for 1 hour to form a single-phase high-entropy carbide. After the reaction, the sample is cooled to room temperature with the furnace to obtain a high-entropy carbide nanopowder .

[0031] In the experiment, the obtained single-phase (Ti 0.2 Zr 0.2 f 0.2 Nb 0.2 Ta 0.2 ) XRD diffraction pattern of C such as figure 1 shown in the transmission electron micrograph figure 2 As shown, the average particle size of the high-entropy carbide nano-powder is 132nm; the element distri...

Embodiment 2

[0033] Add 1.89g of titanium tetrachloride, 2.33g of zirconium tetrachloride, 3.20g of hafnium tetrachloride, 1.57g of vanadium trichloride, and 3.58g of tantalum pentachloride into 50g of absolute ethanol, stir to dissolve it completely, After adding 3.58 g of furfuryl alcohol resin and reacting in a constant temperature water bath at 70° C. for 1 hour, the obtained precursor was dried in an oven at 90° C. to obtain a xerogel. Place the dry gel in a graphite furnace under an argon atmosphere for heat treatment at 1800°C for 1 hour to form a single-phase high-entropy carbide. After the reaction, the sample is cooled to room temperature with the furnace to obtain a high-entropy carbide nanopowder .

[0034] It was detected that: the obtained high-entropy carbide (Ti 0.2 Zr 0.2 f 0.2 V 0.2 Ta 0.2 ) The particle size of the C nanometer powder is concentrated at 165nm, and the oxygen content is 0.13wt%.

Embodiment 3

[0036]Add 3.40g of tetrabutyl titanate, 2.33g of zirconium tetrachloride, 3.20g of hafnium tetrachloride, 1.57g of vanadium trichloride, and 2.73g of molybdenum pentachloride into 50g of absolute ethanol, stir to dissolve completely , adding 3.69g of furfuryl alcohol resin, reacting in a constant temperature water bath at 60°C for 1 hour, then drying the obtained precursor in an oven at 70°C to obtain xerogel. Place the dry gel in a graphite furnace under an argon atmosphere for heat treatment at 1900°C for 1 hour to form a single-phase high-entropy carbide. After the reaction, the sample is cooled to room temperature with the furnace to obtain a high-entropy carbide nanopowder . All the other operations are the same as described in Example 1.

[0037] It was detected that: the obtained high-entropy carbide (Ti 0.2 Zr 0.2 f 0.2 V 0.2 Mo 0.2 ) The particle size of the C nanometer powder is concentrated at 121nm, and the oxygen content is 0.28wt%.

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Abstract

The invention relates to a high-entropy carbide nano-powder and a preparation method thereof. The preparation method comprises the steps that due to a sol-gel reaction between transition metal salt and an organic carbon source, high-entropy carbide liquid precursors, evenly mixed on a molecular level, of components are obtained, and the powder is obtained through drying and high-temperature heat treatment. The method has the advantages of being simple, feasible, wide in application range and the like. The prepared high-entropy carbide nano-powder has the advantages of being small in particle size, narrow in distribution, low in oxygen content and the like. The preparation method is a new method for preparing high-entropy carbide nano-materials.

Description

technical field [0001] The invention belongs to the field of high-entropy materials and their preparation, in particular to a high-entropy carbide nanopowder and its preparation method. Background technique [0002] High-entropy alloys refer to alloys containing five or more metal elements, and the atomic content of each element is between 5-35%, so they are also called multi-principal alloys. Similar to high-entropy alloys, high-entropy ceramics generally refer to ceramic materials with simple crystal structures (eg, BCC, FCC, and HCP) composed of five or more metal elements and one non-metal element. The unit cell of a high-entropy material contains a variety of randomly distributed elements, making it have a high entropy value. Studies have pointed out that high-entropy materials have excellent mechanical properties, thermophysical properties, radiation resistance and corrosion resistance. The transition metal carbides of the fourth to sixth subgroups, such as titanium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/90C04B35/56
CPCC01B32/90C04B35/5603C04B35/5607C01P2002/72C01P2004/04C01P2004/62C04B2235/5445
Inventor 李飞张国军刘吉轩
Owner DONGHUA UNIV
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