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Ceramic with multi-element high entropy as well as preparation method and application of ceramic

A multi-element high-entropy, ceramic technology, applied in the field of surface functional thin film materials, to achieve the effect of fine organization, shortening of grain growth time, energy and cost saving

Active Publication Date: 2019-03-26
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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  • Ceramic with multi-element high entropy as well as preparation method and application of ceramic
  • Ceramic with multi-element high entropy as well as preparation method and application of ceramic

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 )B2 Ultrafine 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 ceramic with multi-element high entropy as well as a preparation method and application of the ceramic. The ceramic isprepared by the following steps: taking an oxide of Me1, an oxide of Me2, an oxide of Me3, an oxide of Me4, an oxide of Me5 and amorphous boron powder as raw materials, performing ball milling, mixing and pressing into a green body; adding the green body into a graphite crucible, and performing vacuum heat treatment to obtain (Me1xMe2yMe3zMe4nMe5m)B2 solid solution powder; raising the temperatureof the solid solution powder to 1000-1400 DEG C by adopting spark plasma sintering, filling a protective atmosphere, and raising to a temperature of 1800-2200 DEG C for calcining, thereby obtaining the product. The prepared multi-element high-entropy ceramic has the relative density of more than 95%, the hardness of 25-35GPa, the breaking tenacity of 2-8MPa*m1 / 2 and the grain size of 0.1-1.1 microns, and after the heat treatment of 1000-1500 DEG C, the weight change rate is 0.3-1%.

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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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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