Super-multielement high-entropy ceramic as well as preparation method and application thereof

A multi-element high-entropy, ceramic technology, applied in the field of ceramic materials, can solve the problems of unreported preparation and research of high-entropy ceramics, and achieve the effects of improving the driving force of sintering, the method is simple, and the cooling speed is fast.

Active Publication Date: 2021-04-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, only five-element high-entropy ceramics have been reported, and the preparation and research of six-element and higher-entropy ceramics have not been reported.

Method used

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  • Super-multielement high-entropy ceramic as well as preparation method and application thereof
  • Super-multielement high-entropy ceramic as well as preparation method and application thereof
  • Super-multielement high-entropy ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), ZrO 2 (powder purity 99.9%, particle size 1μm), Cr 2 o 3 (powder purity 99.9%, particle size 10μm), Nb 2 o 5 (powder purity 99.9%, particle size 1μm) powder, V 2 o 5 (powder purity 99.9%, particle size 1μm) powder, WO 3 (Powder purity 99.9%, particle size 1μm) powder, MoO 3 (Powder purity 99.9%, particle size 1μm) powder, TiO 2 (Powder purity 99.9%, particle size 4μm) and Ta 2 o 5 (Powder purity 99.9%, particle size 1 μm) powder and B (powder purity 99.9%, particle size 2 μm) were mixed with ethanol, and Si 3 N 4 The ball is the ball milling medium, and the ball-to-material ratio is 2:1 and mixed for 24 hours.

[0034] 2. Boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratio of boron powder and Nb is 3.67:1. 2 o 5 , V 2 o 5 and Ta 2 o 5 The molar ratio of boron powder and Cr is 8.07:1. 2 o 3 The molar ratio of boron powder to MoO is 8.8:1 3 and WO 3 The molar ratio is 4.4:1.

[0035] 3....

Embodiment 2

[0040] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), ZrO 2 (powder purity 99.9%, particle size 1μm), Cr 2 o 3 (powder purity 99.9%, particle size 1μm), Nb 2 o 5 (powder purity 99.9%, particle size 1μm) powder, V 2 o 5 (powder purity 99.9%, particle size 1μm) powder, WO 3 (Powder purity 99.9%, particle size 1μm) powder, MoO 3 (powder purity 99.9%, particle size 2μm) powder, TiO 2 (Powder purity 99.9%, particle size 4μm) and Ta 2 o 5 (Powder purity 99.9%, particle size 1 μm) powder and B (powder purity 96.9%, particle size 10 μm) were mixed with ethanol, and Si 3 N 4 The ball is the ball milling medium, and the ball-to-material ratio is 3:1 and mixed for 24 hours.

[0041] 2. Boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratio of boron powder and Nb is 3.78:1. 2 o 5 , V 2 o 5 and Ta 2 o 5 The molar ratio of boron powder and Cr is 8.34:1. 2 o 3 The molar ratio of boron powder to MoO is 8.9:1 3 and WO 3 The molar ratio is 4.2:1.

[0042] 3....

Embodiment 3

[0046] 1. With HfO 2 (powder purity 99.9%, particle size 1μm), ZrO 2 (powder purity 99.9%, particle size 1μm), Cr 2 o 3 (powder purity 99.9%, particle size 10μm), Nb 2 o 5 (powder purity 99.9%, particle size 1μm) powder, V 2 o 5 (powder purity 99.9%, particle size 1μm) powder, WO 3 (Powder purity 99.9%, particle size 3μm) powder, MoO 3 (powder purity 99.9%, particle size 2μm) powder, TiO 2 (Powder purity 99.9%, particle size 4μm) and Ta 2 o 5 (Powder purity 99.9%, particle size 1 μm) powder and B (powder purity 99.9%, particle size 2 μm) were mixed with ethanol, and Si 3 N 4 The ball is a ball milling medium, the ratio of ball to material is 4:1, and the mixture is mixed for 28 hours.

[0047] 2. Boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratio of boron powder and Nb is 3.9:1. 2 o 5 , V 2 o 5 and Ta 2 o 5 The molar ratio of boron powder and Cr is 9:1. 2 o 3 The molar ratio of boron powder to MoO is 8.5:1 3 and WO 3 The molar ratio is 4.4:1.

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses super-multielement high-entropy ceramic as well as a preparation method and application thereof. The molecular formula of the high-entropy ceramic is (HfxZryTazNbaMobWcVdTieCrf)B2, wherein 0<x<1, 0<y<1, 0<z<1, 0<a<1, 0<b<1, 0<c<1, 0<d<1, 0<e<1, 0<f<1, and x+y+z+a+b+c+d+e+f=1; The preparation method comprises the following steps: adding HfO2, ZrO2, Ta2O5, Nb2O5, MoO3, WO3, V2O5, TiO2, Cr2O3 and amorphous boron powder into an organic solvent, mixing, drying, preparing the obtained mixed powder into a green body, and keeping the temperature at 1,400-1,600 DEG C under a vacuum condition to obtain ceramic powder; introducing a protective atmosphere into ceramic powder at 1,000-1,400 DEG C by spark plasma sintering, pressurizing to 10-100 MPa, performing calcining at 1,800-2,200 DEG C, and obtaining the product. The relative density of the super-multielement high-entropy ceramic is greater than 95%, the hardness is 32-45 GPa, and the room-temperature strength is 1,000-1,500 MPa.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more specifically relates to an ultra-multivariate high-entropy ceramic and its preparation method and application. Background technique [0002] High-entropy materials are a new class of crystalline solid-phase materials, which contain five or more elements, and have attracted great attention from researchers due to their unique physical properties and potential applications. To date, much research has focused on high-entropy alloys, which possess excellent mechanical properties, corrosion resistance, and corrosion resistance properties. Compared with high-entropy alloys, high-entropy ceramics mainly include oxide ceramics, nitride ceramics, sulfide ceramics, carbide ceramics, boride ceramics, and silicide ceramics. These newly discovered materials have enhanced properties in terms of electronic or mechanical properties. [0003] The transition metals of the fourth and fifth grou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/64
Inventor 郭伟明张岩张威许亮林华泰
Owner GUANGDONG UNIV OF TECH
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