A kind of ceramic with multivariate high entropy and its preparation method and application

A multi-element high-entropy, ceramic technology, applied in the field of surface functional film materials, to achieve the effect of improving performance, improving sintering performance, and fast diffusion

Active Publication Date: 2021-04-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its preparation uses commercially purchased boride powder, and ceramic materials are sintered after high-energy ball milling, but only a few reports have successfully prepared single-phase high-entropy ceramics, so there is still a lot to be studied about these materials and their characteristics

Method used

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  • A kind of ceramic with multivariate high entropy and its preparation method and application
  • A kind of ceramic with multivariate high entropy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. With HfO 2 , ZrO 2 , Nb 2 o 5 、 Ta 2 o 5 and Cr 2 o 3 And amorphous boron powder as raw material, with ethanol as solvent, with Si 3 N 4 The ball is the ball milling medium, mixed on the ball mill, and the mixed powder is obtained after drying;

[0032] 2. Put the green body obtained after the mixed powder is molded into a graphite crucible, raise the temperature to 1200°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 1h, after vacuum heat treatment The acquisition (Hf 0.2 Zr 0.2 Nb 0.2 Ta 0.2 Cr 0.2 )B 2Ultrafine high-entropy ceramic solid solution powder.

[0033] 3. Will (Hf 0.2 Zr 0.2 Nb 0.2 Ta 0.2 Cr 0.2 )B 2 Multivariate high-entropy solid-melt powder is the raw material powder, put it into a graphite mold, raise the temperature to 2000°C at a heating rate of 300°C / min, keep it warm for 5min, pressurize at 80MPa, and fill it with Ar gas at 1200°C, pass Spark plasma (SPS...

Embodiment 2

[0036] 1. With HfO 2 、MoO 3 , Nb 2 o 5 、 Ta 2 o 5 and TiO 2 And amorphous boron powder as raw material, with ethanol as solvent, with Si 3 N 4 The ball is the ball milling medium, mixed on the ball mill, and the mixed powder is obtained after drying;

[0037] 2. Put the green body obtained after the mixed powder into a graphite crucible, raise the temperature to 1100°C at a rate of 10°C / min and keep it for 1h, then raise the temperature to 1550°C at a rate of 10°C / min and keep it for 1h, after vacuum heat treatment Get (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 Ultrafine high entropy solid solution powder.

[0038] 3. Will (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 Put the multi-element high-entropy solid-melt powder into a graphite mold, raise the temperature to 1800°C at a heating rate of 200°C / min, hold it for 5 minutes, pressurize at 40MPa, and fill Ar gas at 1200°C, and obtain multi-element high-entropy ceramics by discharge plasma sintering Material.

...

Embodiment 3

[0043] 1. With HfO 2 , ZrO 2 , Nb 2 o 5 、MoO 3 and Cr 2 o 3 And amorphous boron powder as raw material, with ethanol as solvent, with Si 3 N 4 The ball is the ball milling medium, mixed on the ball mill, and the mixed powder is obtained after drying;

[0044] 2. Put the green body obtained after the mixed powder is molded 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 1550°C at a rate of 10°C / min and keep it for 1h, after vacuum heat treatment The acquisition (Hf 0.2 Zr 0.2 Nb 0.2 Mo 0.2 Cr 0.2 )B 2 Ultrafine high entropy solid solution powder;

[0045] 3. Will (Hf 0.2 Zr 0.2 Nb 0.2 Mo 0.2 Cr 0.2 )B 2 Put the multi-element high-entropy solid-melt powder into a graphite mold, raise the temperature to 2000°C at a heating rate of 100°C / min, keep it warm for 30min, pressurize at 10MPa, fill with Ar gas at 1200°C, and sinter with multi-element High entropy ceramic materials.

[...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a multi-element high-entropy ceramic and its preparation method and application. The ceramic is made of Me1 oxide, Me2 oxide, Me3 oxide, Me4 oxide, Me5 oxide and amorphous boron powder as raw materials, which are mixed by ball milling and pressed into a green body; put into a graphite crucible for Vacuum heat treatment (Me1xMe2yMe3zMe4nMe5m)B 2 Solid solution powder: It is obtained by filling the above solid solution powder with a protective atmosphere when the temperature is raised to 1000-1400°C by spark plasma sintering, and then heated to 1800-2200°C for calcination. The relative density of the obtained multivariate high-entropy ceramics is >95%, the hardness is 25-35GPa, and the fracture toughness is 2-8MPa·m 1 / 2 , the grain size is 0.1-1.1 μm, and the weight change rate is 0.3-1% after heat treatment at 1000°C-1500°C.

Description

technical field [0001] The invention belongs to the technical field of surface functional thin film materials, and more specifically relates to a multi-component high-entropy ceramic and its preparation method and application. Background technique [0002] With the development of aviation, aerospace, electronics, communication and other technologies, as well as machinery, chemical industry, energy and other industries, more and more requirements are placed on the performance of materials, and traditional single materials can no longer meet the requirements. High-entropy ceramics have five or more components. If they are solid-dissolved into single-phase solid-solution ceramics, it is easy to obtain solid-solution phases and nanostructures with high thermal stability due to their high entropy value. High-entropy ceramics have different properties that outperform traditional ceramic materials. Multi-component high-entropy ceramics are a new world of ceramics that can be synth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/626C04B35/64
CPCC04B35/58064C04B35/6265C04B35/62675C04B35/64C04B2235/3232C04B2235/3241C04B2235/3244C04B2235/3251C04B2235/3256C04B2235/421C04B2235/6562C04B2235/6567C04B2235/658C04B2235/666C04B2235/77C04B2235/785C04B2235/96C04B2235/9615C04B2235/9684
Inventor 郭伟明张岩牛文彬张威林华泰
Owner GUANGDONG UNIV OF TECH
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