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High-entropy ceramic composite material with high strength as well as preparation method and application thereof

A ceramic composite material and composite material technology are applied in the field of high-entropy ceramic composite materials and their preparation, which can solve the problems that have not been studied and the performance of composite materials needs to be studied, and achieve improved material properties, uniform components and fine grains. Effect

Inactive Publication Date: 2019-06-14
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-entropy ceramics with solid solution of various components have not been studied, and the properties of composite materials prepared by mixing and sintering with WC still need to be studied

Method used

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  • High-entropy ceramic composite material with high strength as well as preparation method and application thereof
  • High-entropy ceramic composite material with high strength as well as preparation method and application thereof
  • High-entropy ceramic composite material with high strength as well as preparation method and application thereof

Examples

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), Ta 2 o 5 Powder (powder purity 99.9%, particle size 1μm), Nb 2 o 5 Powder (powder purity 99.9%, particle size 1μm), TiO 2 Powder (purity 99.9%, particle diameter 1 μm) and amorphous boron powder (purity 95.6%, particle diameter 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 1100°C at a rate of 10°C / min and keep it for 2h, then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2h to obtain (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 High entropy solid solution powder;

[0036] 3. Will (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 High-entropy solid solution powder and WC powder (purity of powder ...

Embodiment 2

[0041] 1. Add HfO 2 Powder (powder purity 99.9%, particle size 1μm), ZrO 2 Powder (powder purity 99.9%, particle size 1μm), Ta 2 o 5 Powder (powder purity 99.9%, particle size 1μm), Nb 2 o 5 Powder (powder purity 99.9%, particle size 1μm), TiO 2 Powder (purity 99.9%, particle diameter 1 μm) and amorphous boron powder (purity 95.6%, particle diameter 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;

[0042] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 10°C / min and keep it for 1h, then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2h to obtain (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 High entropy solid solution powder;

[0043] 3. Will (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 High-entropy solid solution powder and WC powder (purity of powder ...

Embodiment 3

[0047] 1. Add HfO2 Powder (powder purity 99.9%, particle size 2μm), ZrO 2 Powder (powder purity 99.9%, particle size 1μm), Ta 2 o 5 Powder (powder purity 99.9%, particle size 2μm), Nb 2 o 5 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 95.6%, 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;

[0048] 2. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1000°C at a rate of 10°C / min and keep it for 1h, then raise the temperature to 1600°C at a rate of 10°C / min and keep it for 2h to obtain (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 High entropy solid solution powder;

[0049] 3. Will (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 High-entropy solid solution powder and WC powder (purity of ...

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Abstract

The invention belongs to the technical field of ceramic materials and discloses a high-entropy ceramic composite material with high strength as well as a preparation method and application thereof. The ceramic composite material is prepared through the following steps: Adding a solvent into metal oxide and amorphous boron powder and mixing and drying to prepare high-entropy solid solution powder under a vacuum condition; firstly, raising the temperature to 1000 to 1200 DEG C and then raising the temperature to 1600 to 1800 DEG C; then adding WC to prepare (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)B2-x mol% WC high-entropy composite material powder; when discharging plasmas are heated to 1000 to 1400 DEG C, filling protection gas; then raising the temperature to 1800 to 2200 DEG C and calcining, wherein xis equal to or greater than 0 and less than or equal to 30. The relative density of ceramic provided by the invention is greater than 94 percent and the rigidity is 20 to 45 GPa; the bending strengthof the ceramic composite material and the high-temperature strength at 1200 to 1800 DEG C are 1000 to 1600 MPa.

Description

technical field [0001] The invention belongs to the technical field of ceramic composite materials, and more specifically relates to a high-strength high-entropy ceramic composite material and its preparation method and application. Background technique [0002] In the past, there were only one to three main components of ceramics, and some trace elements were often added to improve its characteristics. However, in the previous concept, if more elements are added, the material will be brittle, and it will also bring great difficulties to the structure and composition analysis of the material. High-entropy ceramics are a new type of ceramics that have appeared recently. They refer to ceramics with five or more components. If they are solid-dissolved into single-phase solid solution ceramics, they have a high entropy value and are easy to obtain thermal stability. High solid solution phase and nanostructure. Because high-entropy ceramics have many ideal properties such as hi...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/64
Inventor 江泽斌张岩郭伟明吴利翔林华泰
Owner GUANGDONG UNIV OF TECH
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