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A kind of rare earth niobate high-entropy powder, porous high-entropy ceramic and preparation method and application

A niobate and rare earth technology, which is applied in the field of porous high-entropy ceramics and preparation, rare earth niobate high-entropy powder, can solve the problems of poor mechanical properties and lower lattice thermal conductivity, and achieve lower thermal conductivity, Effect of increasing phonon scattering and increasing porosity

Active Publication Date: 2022-07-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its intrinsic mechanical properties are poor, and the lattice thermal conductivity needs to be further reduced through component design.

Method used

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  • A kind of rare earth niobate high-entropy powder, porous high-entropy ceramic and preparation method and application
  • A kind of rare earth niobate high-entropy powder, porous high-entropy ceramic and preparation method and application
  • A kind of rare earth niobate high-entropy powder, porous high-entropy ceramic and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0069] Below for embodiment 1-7 do specific description:

Embodiment 1

[0071] Step 1, ball mill 223.80g nanometer dysprosium oxide, 226.72g nanometer holmium oxide, 231.52g nanometer thulium oxide, 229.51g nanometer erbium oxide, 236.45g nanometer ytterbium oxide, 265.81g nanometer niobium pentoxide and 3576.11g absolute ethanol for 48h , the ball milling speed is 250r / min;

[0072] Step 2, after drying at 60°C for 24h, a mixed material was obtained;

[0073] In step 3, the mixture was calcined at 1450 ° C for 4 h to obtain (Dy 0.2 Ho 0.2 Tm 0.2 Er 0.2 Yb 0.2 ) 3 NbO 7 High entropy powder;

[0074] Step 4, the 100g (Dy 0.2 Ho 0.2 Tm 0.2 Er 0.2 Yb 0.2 ) 3 NbO 7 High-entropy powder, 1000g tert-butanol, 0.5g ammonium citrate and 300g ethylene glycol diglycidyl ether mixed ball milling preparation (Dy 0.2 Ho 0.2 Tm 0.2 Er 0.2 Yb 0.2 ) 3 NbO 7 For high-entropy ceramic suspension, the ball milling speed is 300r / min, and the ball milling time is 24h;

[0075] Step 5, adding 150g of 3,3'-diaminodipropylamine to the high-entropy cera...

Embodiment 2

[0080] Step 1, ball mill 205.60g nanometer dysprosium oxide, 212.69g nanometer thulium oxide, 217.22g nanometer ytterbium oxide, 219.34g nanometer lutetium oxide, 124.47g nanometer yttrium oxide, 244.19g nanometer niobium pentoxide and 3285.29g anhydrous ethanol for 36h , the ball milling speed is 300r / min;

[0081] Step 2, after drying at 60°C for 24h, a mixed material was obtained;

[0082] In step 3, the mixture was calcined at 1500 ° C for 4 h to obtain (Dy 0.2 Tm 0.2 Yb 0.2 Lu 0.2 Y 0.2 ) 3 NbO 7 High entropy powder;

[0083] Step 4, the 500g (Dy 0.2 Tm 0.2 Yb 0.2 Lu 0.2 Y 0.2 ) 3 NbO 7 High-entropy powder, 1000g tert-butanol, 2g polyethyleneimine and 100g ethylene glycol diglycidyl ether mixed ball milling preparation (Dy 0.2 Tm 0.2 Yb 0.2 Lu 0.2 Y 0.2 ) 3 NbO 7 High entropy ceramic suspension;

[0084] Step 5, adding 20 g of 3,3'-diaminodipropylamine to the high-entropy ceramic suspension, curing at 60°C for 12 hours, and drying at 100°C for 24 hou...

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Abstract

The invention discloses a rare earth niobate high-entropy powder, a porous high-entropy ceramic, a preparation method and an application, and belongs to the technical field of high-entropy materials. The raw materials of the rare earth niobate high-entropy powder include rare earth trioxide and niobium pentoxide; the rare earth trioxide is dysprosium oxide, holmium oxide, erbium oxide, thulium oxide, ytterbium oxide, lutetium oxide, and yttrium oxide. In the mixture of 5-7 different trioxides, in any two trioxides, the molar ratio of the trioxide with a large amount to the trioxide with a small amount is 1-3. The present invention introduces different rare earth metal cations through the high entropy of niobate ceramic components. Due to the difference in atomic size in the high entropy phase, its atomic occupancy is shifted, which further leads to lattice distortion and increases the Phonon scattering; Rare earth niobate porous high-entropy ceramics have excellent thermal insulation properties due to the introduction of pore structure that reduces the solid-phase thermal conductivity of the material.

Description

technical field [0001] The invention belongs to the technical field of high-entropy materials, in particular to a rare earth niobate high-entropy powder, a porous high-entropy ceramic, a preparation method and application. Background technique [0002] In recent years, studies have shown that rare earth niobate oxide systems (RE 3 NbO 7 ) has a lower intrinsic thermal conductivity, where RE and Nb atoms have the same occupancy, and with the change of doping element species, it will lead to changes in its crystal structure. When RE=La~Gd, RE 3 NbO 7 Presents an orthogonal structure; when RE=Dy~Lu and Y, RE 3 NbO 7 A disordered defect fluorite structure is present. The fluorite structure with disordered defects will lead to increased phonon scattering centers due to the existence of disordered oxygen vacancies in the lattice, due to the disordered distribution of oxygen vacancies and large chemical inhomogeneity, making niobate ceramics with The advantages of excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/495C04B35/622
CPCC04B38/0645C04B35/495C04B35/622C04B2235/3225C04B2235/3224C04B2235/6562C04B2235/6567C04B2235/95C04B2235/96C04B2235/9607C04B38/0074C04B38/0054
Inventor 许杰杨润伍朱嘉桐孟轩宇位明月高峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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