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High-entropy ceramic material and preparation method thereof

A ceramic material and high-entropy technology, applied in the field of high-entropy ceramic materials and their preparation, can solve problems such as difficult to achieve high-efficiency mass production, inability to realize mass production, complex preparation process, etc., to improve physical and mechanical properties, hardness High, good storage effect

Active Publication Date: 2021-04-30
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the literature "Microstructure of (Hf-Ta-Zr-Nb) High-entropy carbide at micro and nano / atomic level [J]. Journal of the European Ceramic Society, 2018, 38:4303-4307.", ball milling and The spark plasma sintering method successfully prepared carbide high-entropy ceramics with uniform structure and high density by using carbide raw materials. However, due to the complicated preparation process, it is difficult to achieve high-efficiency and large-scale preparation.
In the document "Novel processing route for the fabrication of bulk high-entropy metal diborides [J]. Scripta Materialia, 2019, 158:100-104.", the researchers used self-propagating high-temperature synthesis combined with spark plasma sintering technology to successfully prepare Dense (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 Boride high-entropy ceramics, but because the self-propagating high-temperature reaction process is difficult to control at will, there are more impurities in the generated phase, and the lower purity of high-entropy ceramics will affect its application effect
[0004] The research on high-entropy ceramic materials has attracted more and more attention from scientific researchers in recent years. Their high strength, high hardness, oxidation resistance, thermal stability and other characteristics make them have great application prospects. However, in the current research center on high-entropy ceramics, only a small number of carbide, oxide and diboride high-entropy ceramics have been successfully synthesized.
The development of the existing material system and preparation technology has been greatly restricted, such as the inability to realize mass production, insufficient product purity, cumbersome preparation process and other shortcomings.

Method used

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  • High-entropy ceramic material and preparation method thereof

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Effect test

Embodiment 1

[0046] Step 1: Mix Ti, V, Cr, Nb, Ta, Al and C according to the ratio of the sum of the moles of Ti, V, Cr, Nb, Ta to the moles of Al and the moles of C as 2:1.1:1, wherein The molar numbers of Ti, V, Cr, Nb, Ta are 0.1, 0.4, 0.4, 0.4, 0.7 respectively;

[0047] Step 2: Place the composite powder in a ball mill tank under an argon protection environment for ball milling, the ball milling time is 2 hours, the ball milling speed is 300rmp, the ball-to-material ratio is 5:1, after mixing evenly, take out the composite powder and store it for later use;

[0048] Step 3: Lay the composite powder obtained in step 2 in the hot-press sintering furnace, and evacuate the hot-press sintering furnace, raise the temperature of the hot-press sintering furnace to 1500°C according to the predetermined heating rate of 10°C / min, and then pressurize to 10MPa , hold the pressure for 90 minutes, and reduce the pressure after the end of the heat preservation to obtain a high-entropy ceramic block; ...

Embodiment 2

[0052] Step 1: Mix Ti, V, Cr, Nb, Ta, Al and C according to the ratio of the sum of the moles of Ti, V, Cr, Nb, Ta to the moles of Al and the moles of C as 2:1.1:1, wherein The molar numbers of Ti, V, Cr, Nb, Ta are 0.3, 0.3, 0.4, 0.3, 0.6 respectively;

[0053] Step 2: Place the composite powder in a ball mill tank under an argon protection environment for ball milling, the ball milling time is 2 hours, the ball milling speed is 300rmp, the ball-to-material ratio is 5:1, after mixing evenly, take out the composite powder and store it for later use;

[0054] Step 3: Lay the composite powder obtained in step 2 in the hot-press sintering furnace, and vacuum the hot-press sintering furnace, raise the temperature of the hot-press sintering furnace to 1400°C according to the predetermined heating rate of 10°C / min, and then pressurize to 10MPa , hold the pressure for 120 minutes, and then reduce the pressure after the end of the heat preservation to obtain a high-entropy ceramic blo...

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Abstract

The invention discloses a high-entropy ceramic material and a preparation method thereof. The chemical formula of the high-entropy ceramic material is TiaVbCrcNbdTaeAlC, wherein a + b + c + d + e = 2, and the values of a, b, c, d and e are not completely the same. Therefore, the high-entropy ceramic material has the advantages of high strength, high hardness, strong oxidation resistance, good thermal stability and the like, and has a very wide application prospect in the fields of manned spaceflight, national defense war industry, automobile manufacturing, micro-nano electronics and the like.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, and in particular relates to a high-entropy ceramic material and a preparation method thereof. Background technique [0002] Materials are the material basis for the survival and development of human society. With the rapid development of science and technology, the demand for materials is increasing day by day. Material scientists need to continuously design and develop new material systems with excellent performance to meet the needs of various high-tech fields. requirements. In this era of rapid development, the concept of high-entropy alloys came into being. Its proposal began with the development of bulk amorphous alloys. It mainly refers to the composition of five or more dominant elements. The content of each element Between 5% and 35%, and these new materials have excellent properties that some traditional alloys cannot match. [0003] In recent years, with the rapid development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/645
CPCC04B35/5607C04B35/622C04B35/645C04B2235/3217C04B2235/3239C04B2235/3232C04B2235/3241C04B2235/3251C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/95C04B2235/9607
Inventor 林元华刘超杨岳洋南策文
Owner TSINGHUA UNIV
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