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High-toughness oxidation-resistant textured high-entropy ceramic as well as preparation method and application thereof

A texturing and oxidation-resistant technology, applied in the field of ceramic materials, can solve the problems of high cost and complicated operation, and achieve the effect of low cost, simple operation, and promotion of directional growth of grains

Active Publication Date: 2020-11-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional methods of preparing textured ceramics mainly include thermal processing methods, using template grain growth method, strong magnetic field alignment method, sintering after grouting molding, but these methods are costly and complicated to operate

Method used

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  • High-toughness oxidation-resistant textured high-entropy ceramic as well as preparation method and application thereof
  • High-toughness oxidation-resistant textured high-entropy ceramic as well as preparation method and application thereof
  • High-toughness oxidation-resistant textured 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), TiO 2 (Powder purity 99.9%, particle size 4μm) and Ta 2 o 5 (powder purity 99.9%, particle size 1μm) powder, B 4 C (powder purity 99.9%, particle size 2μm) and graphite powder (purity 99.9%, particle size 1μm), Si 3 N 4 The ball is used as the ball milling medium, and ethanol is used as the solvent, and mixed for 22 hours.

[0034] 2. Graphite powder, B 4 C and HfO 2 or ZrO 2 or TiO 2 The molar ratio of all is 10:8:1, the graphite powder, B 4 C and Ta 2 o 5 The molar ratio is 20:10:10, the graphite powder, B 4 C and Cr 2 o 3 The molar ratio is 10:9:10.

[0035] 3. Mold the mixed powder into a green body, heat-treat it under vacuum, raise the temperature to 1500°C for 2 hours at a heating rate of 15°C / min, and grind and sieve to obtain (Hf 0.2 Zr 0.1 Ta 0.3 Cr 0.1 Ti 0.3 )B 2 Textured high-entr...

Embodiment 2

[0039] 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 1μm), TiO 2 (powder purity 99.9%, particle size 1μm) and Ta 2 o 5 (powder purity 99.9%, particle size 1μm) powder, B 4 C (powder purity 99.9%, particle size 2μm) and graphite powder (purity 99.9%, particle size 1μm), Si 3 N 4 The ball is used as the ball milling medium, and ethanol is used as the solvent, and mixed for 24 hours.

[0040] 2. Graphite powder, B 4 C and HfO 2 or ZrO 2 or TiO 2 The molar ratio of all is 10:6:3, the graphite powder, B 4 C and Ta 2 o 5 The molar ratio is 20:7:10, the graphite powder, B 4 C and Cr 2 o 3 The molar ratio is 10:9:7.

[0041] 3. Mold the mixed powder into a green body, heat treatment under vacuum condition, raise the temperature to 1600°C for 2 hours at a heating rate of 10°C / min, grind and sieve to obtain (Hf 0.2 Zr 0.2 Ta 0.2 Cr 0.2 Ti 0.2 )B 2 Textured high-...

Embodiment 3

[0047] 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 4μm), TiO 2 (powder purity 99.9%, particle size 8μm) and Ta 2 o 5 (powder purity 99.9%, particle size 1μm) powder, B 4 C (powder purity 99.9%, particle size 2μm) and graphite powder (purity 99.9%, particle size 5μm), with Si 3 N 4 The ball is used as the ball milling medium, and ethanol is used as the solvent, and mixed for 20 hours.

[0048] 2. Graphite powder, B 4 C and HfO 2 or ZrO 2 or TiO 2 The molar ratio is 8:6:3, the graphite powder, B 4 C and Ta 2 o 5 The molar ratio of all is 17:7:10, the graphite powder, B 4 C and Cr 2 o 3 The molar ratio is 7:9:7.

[0049] 3. Mold the mixed powder into a green body, heat treatment under vacuum conditions, raise the temperature to 1600°C for 1.5h at a heating rate of 15°C / min, and grind and sieve to obtain (Hf 0.2 Zr 0.2 Ta 0.1 Cr 0.3 Ti 0.2 )B 2 Textured ...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses high-toughness oxidation-resistant textured high-entropy ceramic as well as a preparation method and application thereof. The molecular formula of textured high-entropy ceramic is (HfxZryTazCrnTim)B2, 0.1 <= x <= 1, 0.1 <= y <= 1, 0.1 <= z <= 1, 0.1 <= n <= 1, 0.1 <= m <= 1, and x + y + z + n + m = 1. The ceramic is prepared by the following steps: carrying out mold pressing on mixed powder of metal oxides to prepare a green body, heating the green body to 1400-1600 DEG C under a vacuum condition, carrying out heat treatment, grinding and screening the green body to obtain (HfxZryTazCrnTim)B2 textured high-entropy ceramic powder, heating the powder to 1000-1400 DEG C by spark plasma sintering, introducing a protective atmosphere, heating the mixture to 1800-2200 DEG C, and calcining the product. The textured high-entropy ceramic has a uniform solid solution phase, high toughness and oxidation resistance, and has a textured morphology directionally growing along a c-axis. The ceramic product can be applied to the field of ultrahigh-temperature oxidation resistance or cutters.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more specifically relates to a textured high-entropy ceramic with high toughness and oxidation resistance, and a preparation method and application thereof. Background technique [0002] High-entropy boride ceramics and carbide ceramics are a new class of ultra-high temperature ceramic materials, which have attracted widespread interest from researchers. They have high melting point, high hardness, good corrosion resistance and oxidation resistance, and are significantly better than Monolithic or binary boride or carbide ceramics are expected to be candidates for applications in extreme environments such as aerospace, automotive engines, supersonic vehicles, and nuclear reactors. Since high-entropy ceramics are composed of five or more elements, they can Solve the limitations of single-phase ceramics in practical applications, such as poor damage tolerance and poor critical oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58B26D1/00C04B35/64
CPCB26D1/0006C04B35/58064C04B35/58078C04B35/64B26D2001/002C04B2235/3244C04B2235/3251C04B2235/3241C04B2235/3232C04B2235/3821C04B2235/425C04B2235/666C04B2235/6562
Inventor 郭伟明张岩张威许亮林华泰
Owner GUANGDONG UNIV OF TECH
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