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High-entropy MAX-phase wave-absorbing material and preparation method thereof

A mutual-attraction, high-entropy technology, applied in antennas, electrical components, magnetic/electric field shielding, etc., to achieve the effects of low production cost, strong wave-absorbing ability, and high purity

Pending Publication Date: 2022-07-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that there is no research and report on the hi

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  • High-entropy MAX-phase wave-absorbing material and preparation method thereof
  • High-entropy MAX-phase wave-absorbing material and preparation method thereof
  • High-entropy MAX-phase wave-absorbing material and preparation method thereof

Examples

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Example Embodiment

[0042] In yet another specific embodiment of the present invention, a method for preparing the above-mentioned high-entropy MAX phase wave absorbing material is provided, the method comprising:

[0043] S1. Determine the required amount of powder containing each element according to the stoichiometric ratio of each element in the nominal chemical formula of the high-entropy MAX phase wave absorbing material, and the powder includes M elemental powder, A elemental powder and carbon powder;

[0044] S2, mixing the M elemental powder and the carbon powder in step S1 and sintering;

[0045] S3. The sintered product obtained in step S2 is mixed with A elemental powder and then sintered.

[0046] Wherein, in the step S1,

[0047] M elemental powder is at least four element elemental powders selected from IIIB, IVB, VB and VIB group elements;

[0048] A elemental powder is at least one element elemental powder selected from IIIA, IVA, VA and VIA group elements;

[0049] The molar ra...

Example Embodiment

[0062] Example 1:

[0063] In this example, a high-entropy MAX phase absorbing material was prepared. The specific steps are as follows:

[0064] 1) Prepare powder according to the molar ratio Mo:Cr:Nb:Ti:V:Al:C=0.8:0.8:0.8:0.8:0.8:1.9:2.5;

[0065] 2) grinding and mixing M elemental powder and carbon powder in step 1);

[0066] 3) The mixed powder obtained in step 2) is placed in a corundum crucible, and under Ar atmosphere conditions, the temperature rises at a rate of 5°C / min to 1600°C, and after holding for 3 hours, it is cooled with the furnace;

[0067] 4) grinding and mixing the sintered product in step 3) with A elemental powder;

[0068] 5) Transfer the mixed powder obtained in step 4) to a corundum crucible, and under Ar atmosphere conditions, the temperature rise rate is 5°C / min and the temperature is raised to 1400°C, after holding for 1 hour, it is cooled with the furnace, and the loose block obtained after cooling is taken out. Grinding to obtain the high-ent...

Example Embodiment

[0071] Example 2:

[0072] In this example, a high-entropy MAX phase absorbing material was prepared. The specific steps are as follows:

[0073] 1) Prepare the powder according to the molar ratio Mo:Cr:Ti:V:Al:C=1:1:1:1:2:2.1;

[0074] 2) grinding and mixing M elemental powder and carbon powder in step 1);

[0075] 3) The mixed powder obtained in step 2) is placed in a corundum crucible, and under Ar atmosphere, the temperature rises at a rate of 5°C / min to 1650°C, and after holding for 2 hours, it is cooled with the furnace;

[0076] 4) grinding and mixing the sintered product in step 3) with A elemental powder;

[0077] 5) Transfer the mixed powder obtained in step 4) into a corundum crucible, and under Ar atmosphere conditions, the temperature rise rate is 5°C / min and the temperature is raised to 1500°C, after holding for 1 h, it is cooled with the furnace, and the loose block obtained after cooling is taken out. Grinding to obtain the high-entropy MAX phase (Mo 0.25 ...

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Abstract

The invention provides a high-entropy MAX-phase wave-absorbing material and a preparation method thereof, and belongs to the technical field of preparation of wave-absorbing materials. The nominal molecular formula of the high-entropy MAX-phase wave-absorbing material is Mn + 1AXn, M is at least four elements selected from IIIB, IVB, VB and VIB group elements, A is at least one selected from IIIA, IVA, VA and VIA group elements, X is a carbon element, and n is 1, 2 or 3. Wherein the element ratio in the same site can be regulated and controlled according to actual requirements. The high-entropy MAX-phase wave-absorbing material has the characteristics of high purity, good wave-absorbing performance and wide absorption frequency band, and has an excellent application prospect in the field of wave-absorbing materials. Meanwhile, the powder metallurgy method is simple in process and high in production efficiency, not only solves the problem of mass production, but also is low in energy consumption and low in production cost, thereby having good practical application value.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave absorbing materials, in particular to a high-entropy MAX phase wave absorbing material and a preparation method thereof. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] While the development of communication technology brings great convenience to people's lives, the influence of electromagnetic radiation is also increasing, which brings great harm to people's health and the natural environment. Therefore, it is of great significance to study new absorbing materials to cope with the complex electromagnetic environment. While reducing the pollution of electromagnetic radiation, ...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H05K9/00
CPCH01Q17/008H05K9/0081Y02E60/10
Inventor 毕见强乔琳晶王伟礼杨瑶王弘毅
Owner SHANDONG UNIV
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