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A kind of high temperature resistant and high entropy wave absorbing ceramic and its preparation method and application

A high-temperature, high-entropy technology, applied in chemical instruments and methods, boron/boride, inorganic chemistry, etc., can solve the problem of large adjustability of lattice accommodated metal atom size, low density and high temperature stability, and attenuation of wave absorption performance. and other problems, to achieve the effect of being suitable for large-scale production and application, good high temperature stability, and strong wave absorbing performance

Active Publication Date: 2022-07-05
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when applied at high temperature, both materials have their own inherent defects: the absorbing material based on carbon material will lose its absorbing ability due to the oxidation of carbon material at high temperature, while the ferrite magnetic nanomaterial At high temperature, the absorption performance will be rapidly attenuated due to the weakening of magnetism and the growth of nanomaterial grains.
[0004] The rare earth hexaboride not only has the characteristics of low density and good high temperature stability, but also has a large adjustable size of metal atoms in its crystal lattice, and has a good performance control space, which is conducive to a wide range of its performance by adding different metals. control, but there is no research and report on its electromagnetic absorption performance

Method used

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  • A kind of high temperature resistant and high entropy wave absorbing ceramic and its preparation method and application
  • A kind of high temperature resistant and high entropy wave absorbing ceramic and its preparation method and application
  • A kind of high temperature resistant and high entropy wave absorbing ceramic and its preparation method and application

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preparation example Construction

[0043] The preparation method of high temperature resistant high entropy wave absorbing ceramics of the present invention comprises the following steps:

[0044] (1) mixing the raw material powder with absolute ethanol in a ball mill to obtain a well-mixed slurry;

[0045] (2) the obtained slurry is dried and sieved to obtain a mixed powder, and the powder is put into a high-temperature electric furnace for calcination to obtain a ceramic powder;

[0046] In step (2), the calcination temperature is 1900°C-2000°C, the calcination time is 1-2h, and the calcination vacuum degree is controlled to be 8-15Pa. The sintering temperature and time mainly affect the purity of the ceramic material. If the sintering temperature is too low and lower than the minimum value of the above range, the raw material powder cannot be fully reacted to obtain pure high-entropy hexaboron ceramics. The time is too short and shorter than the minimum value of the above range. When the sintering temperatu...

Embodiment 1

[0049] put Y 2 O 3 , Sm 2 O 3 , Eu 2 O3, Yb 2 O 3 , Er 2 O 3 and B 4 CPress Y 2 O 3 :Sm 2 O 3 :Eu 2 O 3 :Yb 2 O 3 :Er 2 O 3 :B 4The molar ratio of C=1:1:1:1:1:15 was weighed, mixed in a ball mill, the mixing time was 6 hours, the mixing medium was absolute ethanol, and a slurry was obtained; the obtained slurry was filtered and Carry out drying treatment and pass through a 120-mesh sieve to obtain the mixture powder, put the dried powder into a high-temperature furnace for calcination, the calcination temperature is 1900 ° C, the calcination time is 2 hours, and the vacuum degree is 8Pa, to obtain high-entropy hexaboride ceramics (Y 1 / 5 Sm 1 / 5 Eu 1 / 5 Yb 1 / 5 Er 1 / 5 )B 6 Powder, the ceramic purity is 100wt%, the average particle size is 1.86 microns, the maximum absorption loss at 2-18GHz frequency measured by Agilent N5244A vector network analyzer is 33.4dB, and the maximum absorption frequency bandwidth when the reflectivity is below -10dB 3.9GHz. Th...

Embodiment 2

[0051] put Y 2 O 3 , Sm 2 O 3 , Eu 2 O3, Yb 2 O 3 , Er 2 O 3 and B 4 CPress Y 2 O 3 :Sm 2 O 3 :Eu 2 O 3 :Yb 2 O 3 :Er 2 O 3 :B 4 The molar ratio of C=1:1:1:1:1:15 was weighed, mixed in a ball mill, the mixing time was 6 hours, and the mixing medium was anhydrous ethyl alcohol to obtain a slurry; the obtained slurry was Filter and dry and pass through a 120-mesh sieve to obtain the mixture powder, put the dried powder into a high-temperature furnace for calcination, the calcination temperature is 2000 ° C, the calcination time is 1 hour, and the vacuum degree is 15 Pa, to obtain high-entropy hexaboron chemical ceramics (Y 1 / 5 Sm 1 / 5 Eu 1 / 5 Yb 1 / 5 Er 1 / 5 )B 6 Powder, the ceramic purity is 100wt%, the average particle size is 2.1 microns, the maximum absorption loss at 2-18GHz frequency measured by Agilent N5244A vector network analyzer is 30dB, and the maximum absorption frequency bandwidth when the reflectivity is below -10dB is 3.6GHz.

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Abstract

The invention relates to a high-temperature-resistant high-entropy wave-absorbing ceramic and a preparation method and application thereof. The high-entropy ceramic is prepared from the following raw materials in molar ratio: 0.98-1.02 parts of cerium oxide, 0.98-1.02 parts of yttrium oxide, and 0.98 parts of samarium oxide -1.02 parts, erbium oxide 0.98-1.02 parts, ytterbium oxide 0.98-1.02 parts, boron carbide 15 parts. The high-entropy ceramic has the advantages of low density, high purity, strong absorption performance and wide absorption frequency band, the maximum absorption loss is 28-34dB, and the maximum absorption frequency bandwidth is 3.5-3.9GHz. The present invention utilizes high-entropy technology to simultaneously introduce no less than 5 kinds of rare earth metal elements into hexaborides, and obtains a high-temperature-resistant and high-entropy wave-absorbing ceramic through a high-temperature electric furnace under vacuum conditions. Due to the influence of the high-entropy effect, the reaction product The high temperature stability is better, so the required reaction conditions are lower, the process is simple, fast, and practical, suitable for industrial production, and has a good application prospect in the field of wave absorbing materials.

Description

technical field [0001] The invention belongs to the fields of microwave absorbing materials and preparation and application thereof, and relates to a high-temperature-resistant and high-entropy wave-absorbing ceramic, a preparation method and application thereof, in particular to a microwave absorbing ceramic with low density, high purity, strong wave absorption performance and wide absorption frequency band. Entropy ceramics and preparation methods and applications thereof. Background technique [0002] With the development of modern science and technology, all kinds of electronic and electrical equipment have provided great help to people's daily life, but at the same time, the electromagnetic radiation and interference problems generated by these equipment have brought new problems to people's production and life , worsened human existence in space. In addition, in the military field, due to the need for radar stealth, aircraft and need to avoid the role of electromagnet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/04C01B35/00
CPCC01B35/04C01B35/00C01P2006/80C01P2004/61C01P2006/40C01P2006/42
Inventor 向会敏张伟明周延春戴付志
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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