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

A nano-powder and boride technology, applied in the field of high-entropy ceramics, can solve the problems of large-scale high-entropy boride powder particle size, difficulty in large-scale practical application, complex preparation process, etc., and achieve low equipment requirements and small particle size , The effect of simple preparation process

Pending Publication Date: 2021-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis methods of high-entropy boride ceramic powder mainly include boron thermal reduction method, carbon / boride thermal reduction method, molten salt method, etc. These methods generally have high sintering temperature, high requirements for equipment, complicated preparation process, and high entropy of preparation. Coarse particle size of boride powder and other problems make it difficult to carry out large-scale practical application

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of high-entropy boride nanopowder, its preparation method comprises the following steps:

[0036] 1) Add 37.69g of LiCl and 46.07g of KCl into the agate mortar I in a vacuum glove box (filled with argon), grind for 10min, then add 1.60g of HfCl 4 powder, 1.17g of ZrCl 4 powder, 1.79g of TaCl 5 powder, 1.35g of NbCl 5 powder and 4.56g of NaBH 4 Add the powder into the agate mortar II, grind for 10 minutes, then mix the powders in the agate mortar I and the agate mortar II, and grind for 10 minutes to obtain the mixed powder;

[0037] 2) Transfer the mixed powder to a graphite crucible, cover it with a graphite cover and put it into a 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 the indication of the vacuum gauge Whether it changes, if there is no change, it means that the system is well sealed. This process is repeated six times, and then argon is introduce...

Embodiment 2

[0040] A kind of high-entropy boride nanopowder, its preparation method comprises the following steps:

[0041] 1) Add 43.36g of LiCl and 57.44g of KCl in the agate mortar I in a vacuum glove box (filled with argon), grind for 20min, then add 1.60g of HfCl 4 powder, 1.17g of ZrCl 4 powder, 1.79g of TaCl 5 powder, 1.35g of NbCl 5 powder and 5.29g of NaBH 4 Add the powder into the agate mortar II, grind for 20 minutes, then mix the powders in the agate mortar I and the agate mortar II, and grind for 20 minutes to obtain the mixed powder;

[0042] 2) Transfer the mixed powder to a graphite crucible, cover it with a graphite cover and put it into a 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 the indication of the vacuum gauge Whether there is any change, if there is no change, it means that the system is well sealed. This process is repeated six times, and then argon is in...

Embodiment 3

[0047] A kind of high-entropy boride nanopowder, its preparation method comprises the following steps:

[0048] 1) Add 53.82g of LiCl and 65.78g of KCl in the agate mortar I in a vacuum glove box (filled with argon), grind for 30min, then add 1.60g of HfCl 4 powder, 1.17g of ZrCl 4 powder, 1.79g of TaCl 5 powder, 1.35g of NbCl 5 powder and 6.05g of NaBH 4 Add the powder into the agate mortar II, grind for 30 minutes, then mix the powders in the agate mortar I and the agate mortar II, and grind for 30 minutes to obtain the mixed powder;

[0049] 2) Transfer the mixed powder to a graphite crucible, cover it with a graphite cover and put it into a 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 the indication of the vacuum gauge Whether there is any change, if there is no change, it means that the system is well sealed. This process is repeated six times, and then argon is in...

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Abstract

The invention discloses high-entropy boride nano powder as well as a preparation method and application thereof. The high-entropy boride nano powder is prepared from HfCl4, ZrCl4, TaCl5, NbCl5, NaBH4, LiCl and KCl through sintering, water washing and alcohol washing. The preparation method of the high-entropy boride nano powder comprises the following steps of 1, mixing and grinding HfCl4, ZrCl4, TaCl5, NbCl5, NaBH4, LiCl and KCl, and obtaining mixed powder; and 2) sintering the mixed powder in a protective atmosphere at the temperature of 800-900 DEG C, washing with water, washing with alcohol, and drying to obtain the high-entropy boride nano powder. The high-entropy boride nano powder is small in particle size, high in purity, uniform in component, simple in preparation process, low in equipment requirement, low in sintering temperature, free of pollution and suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of high-entropy ceramics, in particular to a high-entropy boride nanopowder and its preparation method and application. Background technique [0002] High-entropy ceramics are a new type of ceramic material, which has the characteristics of high melting point, good corrosion resistance, excellent electrochemical performance, and adjustable performance. It has attracted extensive attention from researchers at home and abroad in recent years. At present, the developed high-entropy ceramics mainly include high-entropy oxides, high-entropy borides, and high-entropy carbides. High-entropy borides have extremely high melting point (>3000°C), low thermal conductivity, high hardness and elastic modulus, and good high-temperature oxidation resistance, and can be used in the leading edge of supersonic aircraft and solid rocket engine throat lining Among components that need to serve in extreme environments, such a...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/58C01B35/04B82Y40/00B82Y30/00
CPCC04B35/62675C04B35/6268C04B35/58007C01B35/04B82Y30/00B82Y40/00C04B2235/3244C04B2235/3251C04B2235/3409C01P2004/64C01P2002/72C01P2004/04
Inventor 褚衍辉韩杨洁唐忠宇
Owner SOUTH CHINA UNIV OF TECH