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High-entropy ceramic composite material with oxidation resistance as well as preparation method and application of high-entropy ceramic composite material

A technology of ceramic composite materials and oxidation resistance, applied in the field of ceramic composite materials, can solve the problems of low temperature performance of boride ceramics, achieve short sintering time, high production efficiency, and increase the effect of crack propagation path

Inactive Publication Date: 2019-07-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Boride ceramics often use sintering aids, high temperature and high pressure methods to improve their sintering performance. The more commonly used substances with low melting points such as Mo and Cr can reduce the sintering temperature and improve the sintering performance, but it will make the high temperature performance of boride ceramics reduce

Method used

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  • High-entropy ceramic composite material with oxidation resistance as well as preparation method and application of high-entropy ceramic composite material
  • High-entropy ceramic composite material with oxidation resistance as well as preparation method and application of high-entropy ceramic composite material
  • High-entropy ceramic composite material with oxidation resistance as well as preparation method and application of high-entropy ceramic composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Add HfO 2 Powder (powder purity 99.9%, particle size 1μm), ZrO 2 Powder (powder purity 99.9%, particle size 1μm), MoO 3 Powder (powder purity 99.9%, particle size 1μm), Cr 2 o 3 Powder (powder purity 99.9%, particle size 1μm), TiO 2 Powder (the purity of powder is 99.9%, particle size 1 μm) and amorphous boron powder (purity 95%, particle size 1 μm) are raw materials, add ethanol solvent and use Si 3 N 4 Mix for the ball milling medium, mix on the ball mill for 24 hours, and obtain the mixed powder after drying;

[0035] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 5°C / min and keep it for 0.5h, and then raise the temperature to 1600°C at a rate of 5°C / min and keep it for 0.5h to obtain (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High entropy solid solution powder;

[0036] 3. Will (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High-entropy solid solution powder and SiC powder (purity...

Embodiment 2

[0040] 1. Add HfO 2 Powder (powder purity 99.9%, particle size 1μm), ZrO 2 Powder (powder purity 99.9%, particle size 1μm), MoO 3 Powder (powder purity 99.9%, particle size 1μm), Cr 2 o 3 Powder (powder purity 99.9%, particle size 1μm), TiO 2 Powder (the purity of powder is 99.9%, particle size 1 μm) and amorphous boron powder (purity 95.1%, particle size 2 μm) are raw materials, add ethanol solvent and use Si 3 N 4 Mix for the ball milling medium, mix on the ball mill for 24 hours, and obtain the mixed powder after drying;

[0041] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1400°C at a rate of 10°C / min and keep it for 1h, then raise the temperature to 1650°C at a rate of 10°C / min and keep it for 1h to obtain (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High entropy solid solution powder;

[0042] 3. Will (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High-entropy solid solution powder and SiC powder (purity of p...

Embodiment 3

[0048] 1. Add HfO 2 Powder (powder purity 99.9%, particle size 2μm), ZrO 2 Powder (powder purity 99.9%, particle size 2μm), MoO 3 Powder (powder purity 99.9%, particle size 1μm), Cr 2 o 3 Powder (powder purity 95.2%, particle size 2μm), TiO 2 Powder (purity 99.9% of powder, particle diameter 2 μm) and amorphous boron powder (purity 97%, particle diameter 2 μm) are raw materials, add ethanol solvent and use Si 3 N 4 Mix for the ball milling medium, mix on the ball mill for 24 hours, and obtain the mixed powder after drying;

[0049] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1150°C at a rate of 15°C / min and keep it for 1.5h, and then raise the temperature to 1750°C at a rate of 15°C / min and keep it for 1.5h to obtain (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High entropy solid solution powder;

[0050] 3. Will (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High-entropy solid solution powder and SiC powder (pur...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a high-entropy ceramic composite material with oxidation resistance and a preparation method and application of the high-entropy ceramic composite material with oxidation resistance. The ceramic composite material (Hf0.2Zr0.2Mo0.2Cr0.2Ti0.2)B2-xvol%SiC is prepared by the following steps: adding a solvent and a ball milling medium into HfO2, ZrO2, MoO3, Cr2O3, TiO2 and amorphous boron powder, and conducting mixing; pressing the mixed powder into a green body; conducting heat treatment under the vacuum condition soas to (Hf0.2Zr0.2Mo0.2Cr0.2Ti0.2)B2 high-entropy solid solution powder; and mixing the obtained high-entropy solid solution powder with SiC to a (Hf0.2Zr0.2Mo0.2Cr0.2Ti0.2)B2-xvol%SiC high-entropy composite material powder, heating the high-entropy composite material powder to 1000-1400 DEG C by adopting spark plasma sintering, introducing a protective atmosphere, conducting heating to 1800-2200 DEG C, and conducting calcining to obtain the high-entropy composite material powder, wherein x is greater than or equal to 0 and less than or equal to 30. The relative density of the obtained high-entropy ceramic composite material is 95%-99.9%, the grain size of the high-entropy ceramic composite material is 1-3 [mu]m, the fracture toughness is 4-12 MPa * m<1 / 2>, and the weight change rate is 0.3-2 wt% after heat treatment at the temperature of 1600-2000 DEG C.

Description

technical field [0001] The invention belongs to the technical field of ceramic composite materials, and more specifically relates to a high-entropy ceramic composite material with oxidation resistance and its preparation method and application. Background technique [0002] High-entropy ceramics are a new type of multi-component solid-solution ceramics with a high entropy value. Compared with traditional ceramics, high-entropy ceramics have high strength, hardness, good wear resistance and structural stability. However, the study found that the density of high-entropy ceramic borides is only about 92%, and the hardness is lower than 23.7GPa, so its densification performance and mechanical properties need to be further improved. [0003] Boride ceramics often use sintering aids, high temperature and high pressure methods to improve their sintering performance. The more commonly used substances with low melting points such as Mo and Cr can reduce the sintering temperature and...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622C04B35/64
CPCC04B35/5805C04B35/622C04B35/64C04B2235/3232C04B2235/3241C04B2235/3244C04B2235/3256C04B2235/3826C04B2235/666
Inventor 江泽斌张岩郭伟明吴利翔林华泰
Owner GUANGDONG UNIV OF TECH
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