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High-entropy carbide ceramic nano-powder as well as preparation method and application thereof

A nano-powder and carbide technology, applied in the field of high-entropy powder materials, can solve the problems of high oxygen impurity content, large powder particle size, uneven element distribution, etc., and achieve low oxygen impurity content, low equipment requirements, The effect of uniform distribution of metal elements

Active Publication Date: 2021-11-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing high-entropy carbide ceramics generally have defects such as large particle size, uneven distribution of elements, and high content of oxygen impurities, which greatly restrict their application.

Method used

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  • High-entropy carbide ceramic nano-powder as well as preparation method and application thereof
  • High-entropy carbide ceramic nano-powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of high-entropy carbide ceramic nanopowder, its preparation method comprises the following steps:

[0038] 1) Add 5.93g of Cr 2 o 3 Powder, 6.16g of TiO 2 Powder, 17.23g of Ta 2 o 5 Powder, 10.37g of Nb 2 o 5 Add the powder, 3.94g of carbon powder and 24.98g of magnesium powder into an agate mortar, grind for 60 minutes by hand, then add 26.20g of NaF, grind for 60 minutes by hand, and then pre-press into tablets under a pressure of 40MPa to obtain a mixed powder Tablet;

[0039] 2) Put the mixed powder into the crucible and put it into the tube furnace, vacuumize the tube furnace so that the value of the vacuum pressure gauge reaches -0.05MPa, keep the vacuum for 10 minutes, and observe whether the indication of the vacuum gauge changes, if there is no Changes indicate that the system is well sealed. This process is repeated six times, and then argon is introduced to normal pressure, and then the furnace temperature is raised from room temperature to 950 ...

Embodiment 2

[0042] A kind of high-entropy carbide ceramic nanopowder, its preparation method comprises the following steps:

[0043] 1) 9.61g of ZrO 2 Powder, 6.16g of TiO 2 Powder, 17.23g of Ta 2 o 5 Powder, 10.37g of Nb 2 o 5 Add the powder, 3.94g of carbon powder and 27.30g of magnesium powder into an agate mortar, grind for 45 minutes by hand, then add 35.37g of NaF, grind for 45 minutes by hand, and then pre-press into tablets under a pressure of 30MPa to obtain a mixed powder Tablet;

[0044]2) Put the mixed powder into the crucible and put it into the tube furnace, vacuumize the tube furnace so that the value of the vacuum pressure gauge reaches -0.05MPa, keep the vacuum for 10 minutes, and observe whether the indication of the vacuum gauge changes, if there is no The change indicates that the system is well sealed. This process is repeated six times, and then argon is introduced to normal pressure, and then the furnace temperature is raised from room temperature to 1000 °C a...

Embodiment 3

[0049] A kind of high-entropy carbide ceramic nanopowder, its preparation method comprises the following steps:

[0050] 1) 9.61g of ZrO 2 Powder, 5.93g of Cr 2 o 3 Powder, 17.23g of Ta 2 o 5 Powder, 10.37g of Nb 2 o 5 Powder, 3.94g of carbon powder and 26.59g of magnesium powder were added to an agate mortar, ground for 30 minutes by hand, then 44.54g of NaF was added, ground for 30 minutes by hand, and then pre-pressed into tablets under a pressure of 20MPa to obtain a mixed powder Tablet;

[0051] 2) Put the mixed powder into the crucible and put it into the tube furnace, vacuumize the tube furnace so that the value of the vacuum pressure gauge reaches -0.05MPa, keep the vacuum for 10 minutes, and observe whether the indication of the vacuum gauge changes, if there is no The change indicates that the system is well sealed. This process is repeated six times, and then argon is introduced to normal pressure, and then the furnace temperature is raised from room temperat...

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Abstract

The invention discloses high-entropy carbide ceramic nano-powder as well as a preparation method and application thereof. The high-entropy carbide ceramic nano-powder is prepared by pre-pressing metal oxide powder, carbon powder, magnesium powder and NaF into sheets, sintering, washing with water and pickling, wherein the metal oxide powder is prepared from at least four of ZrO2, TiO2, Ta2O5, Nb2O5 and Cr2O3 according to an equal molar ratio. The high-entropy carbide ceramic nano-powder is small in particle size, uniform in metal element distribution and low in oxygen impurity content, and the preparation method of the high-entropy carbide ceramic nano-powder has the advantages of being easy to operate, low in operation temperature, short in reaction time, low in equipment requirement and the like, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of high-entropy powder materials, in particular to a high-entropy carbide ceramic nano-powder and its preparation method and application. Background technique [0002] The concept of high-entropy alloys was first proposed by Professor Ye Junwei in 2004. With the development of later research, high-entropy alloys are defined as composed of no less than four main elements and the mass percentage of each component element is 5%~ New alloys in the range of 35%. Inspired by the concept of high-entropy alloys, the concept of high-entropy has also been extended to the field of ceramic materials. High-entropy ceramic materials have attracted much attention in recent years due to their unique properties and huge space for regulating elemental composition. [0003] At present, the reported high-entropy ceramic materials mainly include high-entropy oxides, high-entropy borides, high-entropy carbides, and high-entropy...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622C04B35/65
CPCC04B35/5607C04B35/622C04B35/65C04B2235/6562C04B2235/6567C04B2235/95
Inventor 褚衍辉韩杨洁刘红华
Owner SOUTH CHINA UNIV OF TECH
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