CN116947497A - Medium-entropy or high-entropy carbide nano powder and preparation method thereof - Google Patents
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- 239000011858 nanopowder Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000011259 mixed solution Substances 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 25
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 16
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000005011 phenolic resin Substances 0.000 claims abstract description 15
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000006068 polycondensation reaction Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 229910007926 ZrCl Inorganic materials 0.000 claims description 10
- 239000012298 atmosphere Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
- 238000009776 industrial production Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 15
- 229910002804 graphite Inorganic materials 0.000 description 12
- 239000010439 graphite Substances 0.000 description 12
- 239000002243 precursor Substances 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 229910052735 hafnium Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012705 liquid precursor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a medium-entropy or high-entropy carbide nano powder and a preparation method thereof, comprising the following steps: 1) Adding a Ta source, a Nb source, a Ti source, a Zr source and a Hf source into ethanol to prepare a mixed solution A; or adding a Hf source, a Zr source and a Ti source into ethanol to prepare a mixed solution B; 2) Adding phenolic resin and furfuryl alcohol into the mixed solution A or the mixed solution B, and uniformly mixing to obtain a mixed solution C; 3) Stirring the mixed solution C under the heating condition, performing polycondensation reaction, obtaining a cured product G after the reaction is completed, and drying the cured product; 4) The dried cured product G was carbonized at high temperature to obtain (Ta 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C high entropy powder or(HfZrTi) C. The preparation method has the advantages of simple process flow, no need of other process assistance, short preparation period and low process cost, and is suitable for large-scale industrial production.
Description
Technical Field
The invention relates to the field of nanocomposite materials, in particular to a medium-entropy or high-entropy carbide nano powder and a preparation method thereof.
Background
In recent years, a medium-entropy and high-entropy material is an object of extensive research in the scientific community at home and abroad as a novel material, and the medium-entropy and high-entropy material is the biggest difference compared with the traditional material in that the medium-entropy and high-entropy material is a solid solution formed by elements with various equimolar or nearly equimolar ratios, and has excellent properties which are not possessed by the conventional materials. The concept of medium entropy and high entropy is only widely studied in the alloy field, but with the deep research, the medium entropy and high entropy ceramics are also widely studied, and the medium entropy and high entropy ceramics are taken as a new ceramic material type, and become research hot spots due to the unique composition and excellent performance of the ceramic material type. The thermodynamic stability of the material is improved through multi-component solid solution reaction. (Ta) 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) The C carbide ceramic combines Ta, nb, ti, zr, hf metal elements with C atoms, so as to form a high-entropy solid solution; and (HfZrTi) C carbide ceramic is formed by combining metallic elements of Hf, zr and Ti with C atoms to form a medium entropy solid solution. The high-entropy ceramic plays a vital role in the field of ultra-high temperature application due to the excellent ablation resistance.
Chinese patent application 202010842711.9 reports a preparation method of (HfZrTi) C-based entropy ceramic, which comprises the steps of mixing an oxide corresponding to a metal component with a carbon source, and reacting the metal oxide with the carbon source at 1300-1700 ℃ under vacuum to generate (HfZrTi) C-based entropy ceramic composite powder; and then sintering the ceramic material to obtain the high-temperature-resistant high-strength (HfZrTi) C medium-entropy ceramic material. The preparation method has the advantages of complex process, high cost and high time cost, thus limiting the further development of the method.
The literature "Li F, lu Y, wang X G, et al, liquid pre-reactor-derived high-entropy carbide nano powders [ J ]. Ceramics International,2019,45 (17): 22437-22441" reports that a brown liquid precursor of high-entropy carbide is obtained by a sol-gel method, and then further heated under flowing argon atmosphere at 1600-2000 ℃ to obtain single-phase high-entropy carbide powder. But the method has long preparation period, high cost and environmental pollution.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the medium-entropy or high-entropy carbide nano powder and the preparation method thereof, and the preparation method has the advantages of simple process flow, no need of other process assistance, short preparation period and low process cost, and is suitable for large-scale industrial production.
The invention is realized by the following technical scheme:
the preparation method of the medium-entropy or high-entropy carbide nano powder comprises the following steps:
1) Adding a Ta source, a Nb source, a Ti source, a Zr source and a Hf source into ethanol to prepare a mixed solution A; or adding a Hf source, a Zr source and a Ti source into ethanol to prepare a mixed solution B;
2) Adding phenolic resin and furfuryl alcohol into the mixed solution A or the mixed solution B, and uniformly mixing to obtain a mixed solution C;
3) Stirring the mixed solution C under the heating condition, performing polycondensation reaction, obtaining a cured product G after the reaction is completed, and drying the cured product;
4) The dried cured product G was carbonized at high temperature to obtain (Ta 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C high entropy powder or (HfZrTi) C medium entropy powder.
Preferably, in the mixed solution A, the Ta source, the Nb source, the Ti source, the Zr source and the Hf source are TaCl respectively 5 、NbCl 5 、TiCl 4 、ZrCl 4 HfCl 4 。
Preferably, in the mixed solution A, the molar ratio of the Ta source, the Nb source, the Ti source, the Zr source and the Hf source is 1:1:1:1.
PreferablyIn the mixed solution B, the Hf source, the Zr source and the Ti source are HfCl respectively 4 、ZrCl 4 And TiCl 4 。
Preferably, in the mixed solution B, the mol ratio of the Hf source to the Zr source to the Ti source is 1:1:1.
Preferably, in step 2), the molar ratio of furfuryl alcohol to phenolic resin is 1 (1-3).
Preferably, in step 2), the molar ratio of the total amount of metal in the mixed liquor A or the mixed liquor B to furfuryl alcohol is 1 (1-5).
Preferably, in step 3), the heating temperature is 40 to 60 ℃.
Preferably, in step 4), the high temperature carbonization is specifically: and in Ar atmosphere, heating from room temperature to 2000-2100 ℃ at a heating rate of 3-6 ℃/min, and calcining for 2-4 h.
The medium-entropy or high-entropy carbide nano powder is obtained by adopting the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
compared with the technology of preparing nano powder by using water heat, the method for preparing nano powder by using the medium-entropy or high-entropy carbide does not need external force conditions, but prepares five or three transition metal sources, furfuryl alcohol and phenolic resin into precursor liquid, and performs polycondensation reaction on furfuryl alcohol and phenolic resin in the precursor liquid by regulating and controlling the reaction temperature to obtain a cross-linked and solidified product, and performs carbon heat reduction to obtain the nano powder by using the medium-entropy or high-entropy carbide. The method disclosed by the invention is simple in operation process, does not need other process assistance, is low in cost of raw materials, low in equipment requirement and low in synthesis temperature, and the synthesized carbide nano powder is small in grain size (average grain size is 80 nm), high in purity and uniform in distribution of elements, so that the method has the potential of being developed into large-scale industrial production.
The medium-entropy or high-entropy carbide nano powder prepared by the invention has small grain size (average grain size is 80 nm), high purity and uniform distribution of each element.
Drawings
FIGS. 1 and 2 show the results of examples 3 and 4 of the present invention (HfZ)rTi) entropy powder in C (Ta) 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) XRD pattern of high-entropy powder;
FIGS. 3 and 4 are (HfZrTi) C medium entropy powder and (Ta) synthesized according to examples 3 and 4, respectively, of the present invention 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C, surface Scanning Electron Microscopy (SEM) and X-ray energy spectrum analysis (EDS) images of the high-entropy powder.
Detailed Description
For a further understanding of the present invention, the present invention is described below in conjunction with the following examples, which are provided to further illustrate the features and advantages of the present invention and are not intended to limit the claims of the present invention.
Example 1:
(1) HfCl in amounts of 0.01mol each 4 、ZrCl 4 And TiCl 4 Preparing a mixed solution B with the concentration of 0.3mol/L by the three precursors and an ethanol solvent, and stirring the mixed solution B at room temperature until the mixed solution B is uniform;
(2) taking 20ml of the mixed solution B, and dropwise adding furfuryl alcohol and phenolic resin (n=1:1) into the mixed solution B to obtain a mixed solution C;
(3) placing the mixed solution C in a magnetic stirrer to stir at 60 ℃, and obtaining a cured product G3-1 after the polycondensation reaction of furfuryl alcohol is finished;
(4) and (3) placing the cured product G3-1 obtained in the step (3) in a constant-temperature blast drying oven, setting the temperature to 100 ℃, and taking out after heat preservation for 2 hours.
(5) And (3) respectively placing the dried and cured products G3-1 obtained in the step (4) into graphite crucibles, then placing the graphite crucibles into a vertical atmosphere high temperature furnace, and heating the furnace to 2100 ℃ and preserving heat for 3 hours under the protection of Ar gas with the flow of 300 sccm. The temperature rising rate is 3 ℃/min, and the (HfZrTi) C medium entropy carbide nano powder is obtained after the mixture is cooled to the room temperature along with the furnace.
Example 2:
(1) TaCl in amounts of 0.02mol each 5 、NbCl 5 、TiCl 4 、ZrCl 4 HfCl 4 Preparing a mixed solution A with the concentration of 1.0mol/L from the five precursors and an ethanol solvent, and stirring the mixed solution A to be uniform at room temperature;
(2) taking 20ml of the mixed solution A, and dropwise adding furfuryl alcohol and phenolic resin (n=1:1) into the mixed solution A to obtain a mixed solution C;
(3) placing the mixed solution C in a magnetic stirrer to stir at 60 ℃, and obtaining a cured product G5-1 after the polycondensation reaction of furfuryl alcohol is finished;
(4) and (3) placing the cured product G5-1 obtained in the step (3) in a constant-temperature blast drying oven, setting the temperature to 100 ℃, and taking out after heat preservation for 2 hours.
(5) And (3) respectively placing the dried and cured products G5-1 obtained in the step (4) into graphite crucibles, then placing the graphite crucibles into a vertical atmosphere high temperature furnace, and heating the furnace to 2100 ℃ and preserving heat for 3 hours under the protection of Ar gas with the flow of 300 sccm. The temperature rising rate is 3 ℃/min, and the mixture is cooled to the room temperature along with the furnace, thus obtaining (Ta) 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C, high-entropy carbide nano powder.
Example 3:
(1) HfCl with 0.02mol of each substance 4 、ZrCl 4 And TiCl 4 Preparing a mixed solution B with the concentration of 0.6mol/L by the three precursors and an ethanol solvent, and stirring the mixed solution B at room temperature until the mixed solution B is uniform;
(2) taking 20ml of the mixed solution B, and then dropwise adding furfuryl alcohol and phenolic resin (n=1:2) into the mixed solution B to obtain a mixed solution C;
(3) placing the mixed solution C under the heating of a magnetic stirrer at 50 ℃, and obtaining a cured product G3-2 after the polycondensation reaction of furfuryl alcohol is finished;
(4) and (3) placing the cured product G3-2 obtained in the step (3) in a constant-temperature blast drying oven, setting the temperature to 100 ℃, and taking out after heat preservation for 2 hours.
(5) And (3) respectively placing the dried and cured products G3-2 obtained in the step (4) into graphite crucibles, then placing the graphite crucibles into a vertical atmosphere high temperature furnace, and heating the furnace to 2100 ℃ and preserving heat for 2 hours under the protection of Ar gas with the flow of 300 sccm. The temperature rising rate is 3 ℃/min, and the (HfZrTi) C medium entropy carbide nano powder is obtained after the mixture is cooled to the room temperature along with the furnace.
Example 4:
(1) TaCl in amounts of 0.04mol each 5 、NbCl 5 、TiCl 4 、ZrCl 4 HfCl 4 The five precursors and ethanol solvent are prepared into mixed solution with the concentration of 2.0mol/LA, stirring to be uniform at room temperature;
(2) taking 20ml of the mixed solution A, and then dropwise adding furfuryl alcohol and phenolic resin (n=1:2) into the mixed solution A to obtain a mixed solution C;
(3) placing the mixed solution C under the heating of a magnetic stirrer at 50 ℃, and obtaining a cured product G5-2 after the polycondensation reaction of furfuryl alcohol is finished;
(4) and (3) placing the cured product G5-2 obtained in the step (3) in a constant-temperature blast drying oven, setting the temperature to 100 ℃, and taking out after heat preservation for 2 hours.
(5) And (3) respectively placing the dried and solidified products G5-2 obtained in the step (4) into graphite crucibles, then placing the graphite crucibles into a vertical atmosphere high temperature furnace, and heating the furnace to 2100 ℃ and preserving heat for 2 hours under the protection of Ar gas with the flow of 300 sccm. The temperature rising rate is 3 ℃/min, and the mixture is cooled to the room temperature along with the furnace, thus obtaining (Ta) 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C, high-entropy carbide nano powder.
Example 5:
(1) HfCl with 0.03mol of each substance 4 、ZrCl 4 And TiCl 4 Preparing a mixed solution B with the concentration of 0.9mol/L by the three precursors and an ethanol solvent, and stirring the mixed solution B at room temperature until the mixed solution B is uniform;
(2) taking 20ml of the mixed solution B, and then dropwise adding furfuryl alcohol and phenolic resin (n=1:3) into the mixed solution B to obtain a mixed solution C;
(3) placing the mixed solution C in a magnetic stirrer to heat at 40 ℃, and obtaining a cured product G3-3 after the furfuryl alcohol polycondensation reaction is finished;
(4) and (3) placing the cured product G3-3 obtained in the step (3) in a constant-temperature blast drying oven, setting the temperature to 100 ℃, and taking out after heat preservation for 2 hours.
(5) And (3) respectively placing the dried and cured products G3-3 obtained in the step (4) into graphite crucibles, then placing the graphite crucibles into a vertical atmosphere high temperature furnace, and heating the furnace to 2100 ℃ and preserving heat for 4 hours under the protection of Ar gas with the flow of 300 sccm. The temperature rising rate is 3 ℃/min, and the (HfZrTi) C medium entropy carbide nano powder is obtained after the mixture is cooled to the room temperature along with the furnace.
Example 6:
(1) TaCl in amounts of 0.05mol each 5 、NbCl 5 、TiCl 4 、ZrCl 4 HfCl 4 Preparing a mixed solution A with the concentration of 2.5mol/L from the five precursors and an ethanol solvent, and stirring the mixed solution A to be uniform at room temperature;
(2) taking 20ml of the mixed solution A, and then dropwise adding furfuryl alcohol and phenolic resin (n=1:3) into the mixed solution A to obtain a mixed solution C;
(3) placing the mixed solution C in a magnetic stirrer to heat at 40 ℃, and obtaining a cured product G5-3 after the furfuryl alcohol polycondensation reaction is finished;
(4) and (3) placing the cured product G5-3 obtained in the step (3) in a constant-temperature blast drying oven, setting the temperature to 100 ℃, and taking out after heat preservation for 2 hours.
(5) And (3) respectively placing the dried and solidified products G5-3 obtained in the step (4) into graphite crucibles, then placing the graphite crucibles into a vertical atmosphere high temperature furnace, and heating the furnace to 2100 ℃ and preserving heat for 4 hours under the protection of Ar gas with the flow of 300 sccm. The temperature rising rate is 3 ℃/min, and the mixture is cooled to the room temperature along with the furnace, thus obtaining (Ta) 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C, high-entropy carbide nano powder.
FIGS. 1 and 2 show the results of the synthesis of examples 3 and 4 (Ta 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) XRD patterns of the high-entropy powder and the entropy powder in (HfZrTi) C show that the synthesized powder is single (Ta) 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) The C phase (HfZrTi) C phase has no other hetero-phase, so that the purity of the intermediate-entropy and high-entropy carbide nano powder prepared by the method is higher.
FIGS. 3 and 4 show the results of the synthesis of examples 3 and 4, respectively, (Ta 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C high entropy powder, surface Scanning Electron Microscope (SEM) and X-ray energy spectrum analysis (EDS) images of (HfZrTi) C medium entropy powder, and the images show that the medium entropy and high entropy carbide nano powder prepared by the method of the invention is composed of particles with the size of about 80nm, generally aggregated into clusters and uniformly distributed elements.
The medium-entropy and high-entropy carbide nano powder prepared by the invention has at least the following advantages: according to the invention, a liquid phase method synthesis thought is utilized, the proportion of furfuryl alcohol and phenolic resin is regulated, three transition metal principal elements of Hf, zr and Ti or five transition metal elements of Ta, nb, ti, zr, hf are introduced by utilizing the characteristic of spontaneous polymerization of the furfuryl alcohol and the phenolic resin under a specific temperature condition, so that simple synthesis of the intermediate-entropy and high-entropy carbide nano powder precursor is realized, and the key effect on the expanded production and preparation of the intermediate-entropy and high-entropy carbide nano powder precursor is realized.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the medium-entropy or high-entropy carbide nano powder is characterized by comprising the following steps of:
1) Adding a Ta source, a Nb source, a Ti source, a Zr source and a Hf source into ethanol to prepare a mixed solution A; or adding a Hf source, a Zr source and a Ti source into ethanol to prepare a mixed solution B;
2) Adding phenolic resin and furfuryl alcohol into the mixed solution A or the mixed solution B, and uniformly mixing to obtain a mixed solution C;
3) Stirring the mixed solution C under the heating condition, performing polycondensation reaction, obtaining a cured product G after the reaction is completed, and drying the cured product;
4) The dried cured product G was carbonized at high temperature to obtain (Ta 0.2 Nb 0.2 Ti 0.2 Zr 0.2 Hf 0.2 ) C high entropy powder or (HfZrTi) C medium entropy powder.
2. The method for preparing the nano powder of the medium-entropy or high-entropy carbide according to claim 1, wherein in the mixed solution A, the Ta source, the Nb source, the Ti source, the Zr source and the Hf source are TaCl respectively 5 、NbCl 5 、TiCl 4 、ZrCl 4 HfCl 4 。
3. The method for preparing the nano powder of the medium-entropy or high-entropy carbide according to claim 1, wherein in the mixed solution A, the molar ratio of the Ta source, the Nb source, the Ti source, the Zr source and the Hf source is 1:1:1:1:1.
4. The method for preparing the nano powder of the medium-entropy or high-entropy carbide according to claim 1, wherein in the mixed solution B, the Hf source, the Zr source and the Ti source are HfCl respectively 4 、ZrCl 4 And TiCl 4 。
5. The method for preparing the nano powder of the medium-entropy or high-entropy carbide according to claim 1, wherein the molar ratio of the Hf source to the Zr source to the Ti source in the mixed solution B is 1:1:1.
6. The method for preparing the nano powder of the medium-entropy or high-entropy carbide according to claim 1, wherein in the step 2), the molar ratio of the furfuryl alcohol to the phenolic resin is 1 (1-3).
7. The method for preparing nano powder of medium-entropy or high-entropy carbide according to claim 1, wherein in the step 2), the molar ratio of the total metal amount in the mixed solution A or the mixed solution B to furfuryl alcohol is 1 (1-5).
8. The method for preparing nano powder of medium-entropy or high-entropy carbide according to claim 1, wherein in step 3), the heating temperature is 40-60 ℃.
9. The method for preparing the medium-entropy or high-entropy carbide nano powder according to claim 1, wherein in the step 4), the high-temperature carbonization is specifically: and in Ar atmosphere, heating from room temperature to 2000-2100 ℃ at a heating rate of 3-6 ℃/min, and calcining for 2-4 h.
10. A medium-or high-entropy carbide nanopowder obtained by the preparation method according to any one of claims 1 to 9.
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