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High-entropy ceramic with high-temperature strength and hardness as well as preparation method and application thereof

A high-temperature strength, high-entropy technology, applied in the field of ceramic materials, can solve the problems of difficult solid solution formation of single-phase high-entropy ceramics, different lattice structures, affecting applications, etc., to achieve excellent mechanical properties and oxidation resistance, composition The effect of uniform distribution and improvement of sintering performance

Inactive Publication Date: 2019-04-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is basically no WB in business 2 powder, which uses W 2 B 5 powder as an alternative, prepared (Hf 0.2 Zr 0.2 W 0.2 Mo 0.2 Ti 0.2 )B 2 The material is not a single-phase high-entropy ceramic, but exists (Ti 1.6 W 2.4 )B 4 Phase, W 2 B 5 powder and other borides (ZrB 2 、TiB 2 , HfB 2 、TaB 2 , CrB 2 etc.) The lattice structure is not the same, it is difficult to form a solid solution to form a single-phase high-entropy ceramic, which reduces its performance and affects its application at high temperature

Method used

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  • High-entropy ceramic with high-temperature strength and hardness as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), ZrO 2 (powder purity 99.9%, particle size 2μm), MoO 3 (powder purity 99.9%, particle size 2μm) and TiO 2 (purity 99% of powder, 2 μm of particle diameter) powder powder is batching and amorphous boron powder (purity 96%, 2 μm of particle diameter) in equal atomic ratio as raw material, for obtaining (Hf 0.25 Zr 0.25 Mo 0.25 Ti 0.25 )B 2 Mix the above oxides with amorphous boron powder.

[0031] 2. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0032] 3. Put the mixed powder into the graphite crucible, raise the temperature to 1100°C at a rate of 10°C / min and keep it for 2 hours, then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 1 hour. The whole sintering process is Vacuum, pressure is 0.1Pa, the powder that obtains grinds and sieves again, obtain...

Embodiment 2

[0036] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), ZrO 2 (powder purity 99.9%, particle size 2μm), WO 3 (powder purity 99.9%, particle size 2μm), MoO 3 (powder purity 99.9%, particle size 2μm) and TiO 2 (purity 99% of powder, 2 μm of particle diameter) powder powder is batching and amorphous boron powder (purity 96%, 2 μm of particle diameter) in equal atomic ratio as raw material, for obtaining (Hf 0.1 Zr 0.2 W 0.3 Mo 0.2 Ti 0.2 )B 2 Mix the above oxides with amorphous boron powder.

[0037] 2. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0038] 3. Put the mixed powder molded green body into a graphite crucible, raise the temperature to 1100°C at a rate of 10°C / min and keep it for 1 hour, then raise the temperature to 1500°C at a rate of 10°C / min and hold it for 1 hour. The whole sintering process is Vacuum, pressure...

Embodiment 3

[0042] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), ZrO 2 (powder purity 99.9%, particle size 2μm), WO 3 (powder purity 99.9%, particle size 2μm), MoO 3 (powder purity 99.9%, particle size 2μm) and TiO 2 (purity 99% of powder, 2 μm of particle diameter) powder powder is batching and amorphous boron powder (purity 96%, 2 μm of particle diameter) in equal atomic ratio as raw material, for obtaining (Hf 0.2 Zr 0.3 W 0.1 Mo 0.2 Ti 0.2 )B 2 Mix the above oxides with amorphous boron powder.

[0043] 2. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0044] 3. Put the mixed powder into the graphite crucible, raise the temperature to 1000°C at a rate of 10°C / min and keep it for 1 hour, then raise the temperature to 1550°C at a rate of 10°C / min and hold it for 1 hour. The whole sintering process is Vacuum, pressure is 0.1Pa, the p...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a high-entropy ceramic with high-temperature strength and hardness as well as a preparation method and application thereof. The ceramic is characterized in that HfO2, ZrO2, WO3, MoO3, TiO2 and amorphous boron powder are treated as raw materials; the raw materials are subjected to ball milling and mixing and then are pressed into a blank; the blank is subjected to vacuum heat treatment in a graphite crucible to obtain (HfxZryWzMonTim)B2 solid melt powder; the solid melt powder is subjected to spark plasma sintering, and protecting atmosphere is charged while the temperature of the solid melt powder is increased to 1000-1400 DEG C, and then the temperature is increased to 1800-2200 DEG C for roasting the solid melt powder to obtain the product. The molecular formula of the ceramic is (HfxZryWzMonTim)B2, wherein x is greater than or equal to 0 and less than or equal to 1; y is greater than or equal to 0 and less than or equal to 1; z is greater than or equal to 0 and less than or equal to 1; n is greater than or equal to 0 and less than or equal to 1; m is greater than or equal to 0 and less than or equalto 1; and the sum of x, y, z, n and m is equal to 1; the hardness of the ceramic is 28-42GPa; the breaking tenacity is 5-10MPa.m<1 / 2>; the flexure strength and the high temperature strength are 800-1500MPa; and the weight rate after heat treatment is 0.3-0.5%.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more specifically relates to a high-entropy ceramic with high-temperature strength and hardness, its preparation method and application. Background technique [0002] Ultra-high temperature ceramic boride ZrB 2 、TiB 2 , HfB 2 It has good thermal stability and chemical stability, which has attracted great attention of researchers. Candidate materials for extreme environments such as rocket engines (in a chemical reaction atmosphere, above 3000°C). Since its melting point is above 3000°C, it still has good strength and good thermal shock resistance above 1200°C, so it is expected to be applied to the leading edge of the wing and other parts that need to be used in extreme environments. So now researchers are working on how to further improve its performance to adapt to applications in extreme environments. Preparation of solid solution can effectively improve the performance of m...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/66C04B35/64
CPCC04B35/58064C04B35/64C04B35/66C04B2235/3232C04B2235/3244C04B2235/3256C04B2235/3258C04B2235/661C04B2235/666C04B2235/77C04B2235/96
Inventor 郭伟明张岩吴利翔张威林华泰
Owner GUANGDONG UNIV OF TECH
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