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A kind of high-entropy carbide ceramic nano-powder and its preparation method and application

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

Active Publication Date: 2022-07-26
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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  • A kind of high-entropy carbide ceramic nano-powder and its preparation method and application
  • A kind of high-entropy carbide ceramic nano-powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A high-entropy carbide ceramic nano-powder, the preparation method of which comprises the following steps:

[0038] 1) Put 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 The powder, 3.94g of carbon powder and 24.98g of magnesium powder were added into an agate mortar, ground by hand for 60 minutes, then added with 26.20g of NaF, ground by hand for 60 minutes, and then pre-compressed into tablets under the pressure of 40MPa to obtain mixed powder tablet;

[0039] 2) Put the mixed powder into the crucible and put it into the tube furnace, vacuumize the tube furnace to make the value of the vacuum pressure gauge reach -0.05MPa, keep the vacuum for 10min, and observe whether the indication of the vacuum gauge changes, if no The change indicates that the system is well sealed. This process is repeated six times, and then argon gas is introduced to normal pressure, and then the furnace temperature is raised from room temp...

Embodiment 2

[0042] A high-entropy carbide ceramic nano-powder, the preparation method of which comprises the following steps:

[0043] 1) Put 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 The powder, 3.94g of carbon powder and 27.30g of magnesium powder were added into an agate mortar, ground by hand for 45 minutes, then added with 35.37g of NaF, ground by hand for 45 minutes, and then pre-compressed into tablets under the pressure of 30MPa to obtain mixed powder tablet;

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

Embodiment 3

[0049] A high-entropy carbide ceramic nano-powder, the preparation method of which comprises the following steps:

[0050] 1) Put 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 The powder, 3.94g of carbon powder and 26.59g of magnesium powder were added to an agate mortar, ground by hand for 30 minutes, then added with 44.54g of NaF, ground by hand for 30 minutes, and then pre-compressed into tablets under the pressure of 20MPa to obtain mixed powder tablet;

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

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Abstract

The invention discloses a high-entropy carbide ceramic nano-powder and a preparation method and application thereof. The high-entropy carbide ceramic nano-powder of the present invention is prepared by pre-pressing metal oxide powder, carbon powder, magnesium powder and NaF into flakes and then sintering, washing with water and pickling, and the metal oxide powder is made of ZrO 2 , TiO 2 , Ta 2 O 5 , Nb 2 O 5 and Cr 2 O 3 At least four of them are composed in equimolar ratio. The high-entropy carbide ceramic nano-powder of the present invention has small particle size, uniform distribution of metal elements, low oxygen impurity content, and the preparation method has the advantages of simple operation, low operating temperature, short reaction time, low equipment requirements, etc., 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 a preparation method and application thereof. Background technique [0002] The concept of high-entropy alloy was first proposed by Professor Ye Junwei in 2004. With the development of later research, high-entropy alloy is defined as consisting of no less than four main elements and the mass percentage of each element is 5%~ New alloys in the 35% range. 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 elemental composition control. [0003] At present, the reported high-entropy ceramic materials mainly include high-entropy oxides, high-entropy borides, high-entropy carbides, and high-entropy silicides....

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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