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High-temperature-resistant transition metal high-entropy oxide wave-absorbing filler and preparation method thereof

A transition metal and wave-absorbing filler technology, applied in the field of high-temperature-resistant high-entropy oxides and their preparation, can solve the problems of insufficient microwave loss capacity and single loss mode, and achieve excellent high temperature resistance and oxidation resistance, and high powder purity , the effect of reducing production costs

Active Publication Date: 2021-07-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing high-entropy oxides are generally in a single-phase structure, which makes them have problems such as insufficient microwave loss capability and single loss mode.

Method used

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  • High-temperature-resistant transition metal high-entropy oxide wave-absorbing filler and preparation method thereof
  • High-temperature-resistant transition metal high-entropy oxide wave-absorbing filler and preparation method thereof
  • High-temperature-resistant transition metal high-entropy oxide wave-absorbing filler and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] With Fe(NO 3 ) 3 9H 2 O particles, Co(NO 3 ) 2 ·6H 2 O particles, NiSO 4 ·6H 2 O particles, Cr(NO 3 ) 2 9H 2 O particles, MnSO 4 ·H 2 O powder is reactant, K 2 CO 3 1.5H 2 O powder is a precipitant, which is dissolved in deionized water and stirred until completely dissolved. The molar concentration ratio of cations (Fe ions: Co ions: Ni ions: Cr ions: Mn ions) in the reactants is x:1:1 :1:1 (1≤x≤6), the gradient interval of the Fe content of the components is 0.5, the total cation concentration in the reactant solution is 0.1mol / L, and the concentration of the precipitant solution is 0.15mol / L. Add the reactant solution dropwise to the precipitant solution at a rate of 40ml / min, keep stirring for 4 hours, then let it stand for 24 hours, pour off the supernatant, and centrifuge the precipitate (speed 7000rpm) to obtain high entropy Oxide precursor; place the precursor in an oven at 80°C (air atmosphere) to dry for 12 hours, then grind the dried sample int...

Embodiment 2

[0051] With Fe(NO 3 ) 3 9H 2 O particles, Co(NO 3 ) 2 ·6H 2 O particles, NiSO 4 ·6H 2 O particles, Cr(NO 3 ) 2 9H 2 O particles, MnSO 4 ·H 2 O powder is reactant, K 2 CO 3 1.5H 2 O powder is a precipitant, which is dissolved in deionized water and stirred until completely dissolved. The molar concentration ratio of cations in the reactant is 1:1:1:1:1, and the total cation concentration in the reactant solution is 0.1mol / L, the concentration of precipitant solution is 0.15mol / L. With the rate of addition of 40ml / min, the reactant solution was added dropwise in the precipitating agent solution, kept stirring for 4 hours, then left standstill for 24 hours, poured off the supernatant, and the precipitate was subjected to centrifugal filtration (speed 7000rpm) to obtain high Entropy oxide precursor; place the precursor in an oven at 80°C (air atmosphere) to dry for 12 hours, then grind the dried sample into powder, place it in Al 2 o 3 crucible, then put the cruc...

Embodiment 3

[0054] With Fe(NO 3 ) 3 9H 2 O particles, Co(NO 3 ) 2 ·6H 2 O particles, NiSO 4 ·6H 2 O particles, Cr(NO 3 ) 2 9H 2 O particles, MnSO 4 ·H 2 O powder is reactant, K 2 CO 3 1.5H 2 O powder is a precipitant, which is dissolved in deionized water and stirred until completely dissolved. The molar concentration ratio of cations in the reactant is 4:1:1:1:1, and the total cation concentration in the reactant solution is 0.1 mol / L, the concentration of precipitant solution is 0.15mol / L. With the rate of addition of 40ml / min, reactant solution was added dropwise in precipitant solution, kept stirring for 4 hours, then left standstill for 24 hours, poured off supernatant, precipitate was carried out centrifugation (speed 7000rpm), obtained high Entropy oxide precursor; place the precursor in an oven at 80°C (air atmosphere) to dry for 12 hours, then grind the dried sample into powder, place it in Al 2 o 3 Put the crucible into a tube furnace, raise the temperature to 4...

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Abstract

The invention relates to a high-temperature-resistant transition metal high-entropy oxide wave-absorbing filler and a preparation method thereof. The composition of the high-temperature-resistant transition metal high-entropy oxide wave-absorbing filler is (1) a spinel structure (Fea / (4+a)Co1 / (4+a)Ni1 / (4+a)Cr1 / (4+a)Mn1 / (4+a))3O4, wherein a is greater than or equal to 1 and less than or equal to 3.5; or (2) a corundum-type structure ((Feb / (4+b)Co1 / (4+b)Ni1 / (4+b)Cr1 / (4+b)Mn1 / (4+b))2O3, wherein 5 < = b < = 6; or a combination of (1) + (2).

Description

technical field [0001] The invention relates to a high-temperature-resistant high-entropy oxide and a preparation method thereof, in particular to a high-temperature-resistant transition metal high-entropy oxide wave-absorbing filler formed by adjusting the content of component Fe to form a single phase or two phases coexisting, so as to improve electromagnetic wave absorption The method of the invention belongs to the field of high-temperature-resistant wave-absorbing materials. Background technique [0002] With the acceleration of offensive and defensive transitions in modern warfare, all-round stealth has become an important research goal. Among them, the engine and the rear body structure are the most important radar scattering sources. On the one hand, due to the constraints of dynamic conditions, there is limited room for stealth design; Unable to apply. High-entropy oxides have excellent properties such as oxidation resistance, high temperature resistance, and corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/626
CPCC04B35/265C04B35/62605C04B2235/3275C04B2235/3279C04B2235/3241C04B2235/3262C04B2235/96
Inventor 邓瑞翔戴国豪张涛张科于云宋力昕
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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