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Infrared stealth coating containing rare-earth-doped nano Al2O3 powder

A nano-alumina and rare earth doping technology, applied in the preparation of aluminum hydroxide, coatings, anti-corrosion coatings, etc., can solve the problems of high density, high infrared emissivity, difficult broadband absorption, etc., to achieve improved corrosion resistance, infrared The effect of low emissivity and simple production process

Active Publication Date: 2018-11-20
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention aims at the shortcomings of existing infrared stealth materials such as high density, high infrared emissivity, and difficulty in broadband absorption, and discloses a rare earth-doped nano-alumina powder infrared stealth coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Configure 1mmol / mLAlCl 3 ·6H 2 O solution, 0.1mmol / mL ErCl 3 solution with 1mmol / mLNa 2 CO 3 solution.

[0020] (2) Measure 25mL of AlCl 3 solution and 2.5mLErCl 3 Put the solution into a beaker and heat it in a water bath at 40°C.

[0021] (3) Measure 50mL of Na 2 CO 3 The solution was placed in another beaker, which was also heated in a water bath at 40°C.

[0022] (4) Na 2 CO 3 Add AlCl to the solution at a rate of 1mL / min 3 ·6H 2 O solution, mechanically stirred to form a precipitate, after reacting for 30 minutes, stop stirring and let it age for 20 minutes.

[0023] (5) After the reaction is finished, filter through a vacuum filter, and wash with deionized water until there is no chloride ion.

[0024] (6) Dry the precipitate with an optimized microwave drying process. After the dried precursor was ground, it was put into a crucible, placed in a muffle furnace, and calcined at 500 °C for 1.5 h to obtain rare earth Er-doped Al 2 o 3 Powder.

...

Embodiment 2

[0031] (1) Configure 1mmol / mLAlCl 3 ·6H 2 O solution, 0.1mmol / mL ErCl 3 solution with 1mmol / mLNa 2 CO 3 solution.

[0032] (2) Measure 30mL of AlCl 3 solution and 2.8mLErCl 3 Put the solution into a beaker and heat it in a water bath at 40°C.

[0033] (3) Measure 50mL of Na 2 CO 3 The solution was placed in another beaker, which was also heated in a water bath at 40°C.

[0034] (4) Na 2 CO 3 Add AlCl to the solution at a rate of 2mL / min 3 ·6H 2 O solution, mechanically stirred to form a precipitate, after reacting for 30 minutes, stop stirring and let it age for 20 minutes.

[0035] (5) After the reaction is finished, filter through a vacuum filter, and wash with deionized water until there is no chloride ion.

[0036] (6) Dry the precipitate with an optimized microwave drying process. After the dried precursor is ground, it is put into a crucible, placed in a muffle furnace, and calcined at 700 ° C for 1.5 h to obtain rare earth Er-doped Al 2 o 3 Powder.

[...

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Abstract

The invention relates to an infrared stealth coating containing rare-earth-doped nano Al2O3 powder. The rare-earth-doped nano Al2O3 powder with the particle size ranging from 20 nm to 50 nm is prepared from AlCl3*6H2O, ErCl3 and Na2CO3 which are in the mole ratio being (2.5-4):(0.025-0.038):5 with the direct precipitation method; then the rare-earth-doped nano Al2O3 powder is modified by a silanecoupling agent KH570 which accounts for 6%-12% of the rare-earth-doped nano Al2O3 powder in mass; the modified rare-earth-doped nano Al2O3 powder is dispersed in absolute ethyl alcohol in the proportion of 1 g / mL, the solution is mixed with polyurethane, then the solution is sprayed to an aluminum substrate, the infrared stealth coating containing the rare-earth-doped nano Al2O3 powder is obtainedthrough curing, and the mass ratio of rare-earth-doped nano Al2O3 to the polyurethane is (1-2):3. The preparation technology is simple, and the infrared stealth coating is low in density, low in infrared reflectivity and high in transparency and has the good physical, mechanical and chemical properties.

Description

technical field [0001] The invention relates to a rare earth-doped nano-alumina powder infrared stealth coating, which relates to infrared electromagnetic wave shielding and absorbing materials, and specifically belongs to the technical field of infrared stealth materials. Background technique [0002] Infrared stealth technology refers to a means to change the infrared radiation characteristics of the target and reduce the probability of the target being detected by the infrared detector. It includes two aspects: one is to weaken the infrared radiation intensity of the target, making it lower than the sensitivity of the infrared detector, so as to achieve the purpose of stealth to the detector; the second is to change the infrared radiation frequency range of the target to avoid the atmospheric infrared window , or by controlling the infrared radiation intensity of each part of the target, reducing the contrast between the target and the background to achieve the effect of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/62C09D5/08C01F7/34
CPCC01F7/34C01P2004/64C08K2003/2227C08K2201/011C09D5/08C09D7/62C09D175/04C08K9/06C08K3/22
Inventor 刘崇波张祥刘辉林刘顺尧邹紫薇
Owner NANCHANG HANGKONG UNIVERSITY
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