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A high-entropy ceramic composite material with oxidation resistance and its preparation method and application

A technology of ceramic composite materials and oxidation resistance, which is applied in the field of ceramic composite materials, can solve the problems of low temperature performance of boride ceramics, etc., and achieve the effects of short sintering time, improved toughness and high purity

Inactive Publication Date: 2021-07-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A high-entropy ceramic composite material with oxidation resistance and its preparation method and application
  • A high-entropy ceramic composite material with oxidation resistance and its preparation method and application
  • A high-entropy ceramic composite material with oxidation resistance and its preparation method and application

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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 its preparation method and application. The ceramic composite material (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 ‑xvol% SiC is in HfO 2 , ZrO 2 、MoO 3 、Cr 2 o 3 、TiO 2 Adding solvent and ball milling medium to the amorphous boron powder is mixed, and the mixed powder is pressed into a green body, and heat treatment is carried out under vacuum conditions, and the vacuum heat treatment is carried out to obtain (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 High-entropy solid solution powder obtained after mixing SiC (Hf 0.2 Zr 0.2 Mo 0.2 Cr 0.2 Ti 0.2 )B 2 ‑xvol% SiC high-entropy composite material powder is obtained by filling the high-entropy composite material powder with a protective atmosphere when the temperature is raised to 1000-1400°C by spark plasma sintering, and then calcined at 1800-2200°C, where 0≤x≤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 μm, and the fracture toughness is 4-12 MPa·m 1 / 2 , after heat treatment at 1600°C-2000°C, the weight change rate is 0.3-2wt%.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/64
CPCC04B35/5805C04B35/622C04B35/64C04B2235/3232C04B2235/3241C04B2235/3244C04B2235/3256C04B2235/3826C04B2235/666
Inventor 郭伟明张岩江泽斌吴利翔林华泰
Owner GUANGDONG UNIV OF TECH
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