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A low absorption/emission ratio adaptive temperature control material and its preparation method

A self-adaptive, low-absorbing technology, applied in the field of new materials, can solve the problems of restricting thermal control ability, limited application, complex structure, etc., and achieve the effect of optimizing material components and processes, expanding application fields, and low cost

Active Publication Date: 2021-02-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the literature (Wu Chunhua et al., a thin film for changing the temperature control ability of intelligent thermal control materials and its preparation method, Chinese patent CN104561897A) has no 2 The multi-layer film system design of the material basically meets the application requirements, but there are disadvantages such as complex structure, high cost, and limited application.
Another thermally induced phase change variable emissivity material La 1-x A x MnO 3 Usually, the appearance is dark blue / black (Zhang Yong et al., A preparation method of intelligent thermal radiation ceramic material, Chinese patent CN101531513B), and its solar absorption ratio is as high as 0.89, which seriously restricts its thermal control ability

Method used

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  • A low absorption/emission ratio adaptive temperature control material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) According to the stoichiometric ratio Ba y A x TiO 3 Weigh 1mol TiO 2 Powder, 0.4mol strontium carbonate (component A), 0.6mol barium carbonate, the purity of the three is >99.9%, and the particle size of the powder is in the submicron size;

[0025] 2) Mix the powder weighed in step 1) with agate balls and water in a volume ratio of 1:1:1, put them into an agate ball mill jar, mix and grind them with a planetary ball mill for 24 hours, take them out, and dry them at 100°C;

[0026] 3) Pass the powder in step 2) through a 100-mesh sieve, put it into a corundum crucible and place it in a muffle furnace, pre-fire at 1000°C for 1 hour, and cool to room temperature with the furnace;

[0027] 4) Take out the powder in step 3) and put in 0.005mol Al 2 o 3 and 0.024mol nano-SiO 2 , put it into the agate jar again for ball milling for 10 hours, take it out and dry it

[0028] 5) Add the powder in step 4) to granulate with polyvinyl alcohol aqueous solution (concentrat...

Embodiment 2

[0031] 1) Weigh 1mol TiO 2 Powder, 0.7mol Ba carbonate (barium carbonate), 0.3mol Sr carbonate (strontium carbonate A component), powder purity>99.9%, particle size in submicron size;

[0032] 2) Mix the powder weighed in step 1) with agate balls and ethanol at a volume ratio of 1:1:1, put them into an agate ball mill jar, mix and grind them with a planetary ball mill for 24 hours, take them out, and dry them at 100°C;

[0033] 3) Pass the powder in step 2) through a 100-mesh sieve, put it into a crucible and place it in a muffle furnace, pre-fire at 1150°C for 0.5h, and cool to room temperature with the furnace;

[0034] 4) Take out the powder in step 3) and put in 0.003mol Al 2 o 3 , 0.002mol MnO 2 and 0.02mol nano-SiO 2 , put it into the agate jar again for ball milling for 10 hours, take it out and dry it

[0035] 5) Add the powder in step 4) to granulate with polyvinyl alcohol aqueous solution (concentration 1at%), the amount of polyvinyl alcohol aqueous solution add...

Embodiment 3

[0038] 1) Weigh 1mol TiO 2 , 0.6mol barium carbonate, 0.3mol strontium carbonate, 0.1mol tin carbonate, powder purity>99.9%, particle size in submicron size;

[0039] 2) Mix the powder weighed in step 1) with agate balls, water or ethanol at a volume ratio of 1:1:1, put them into an agate ball mill jar, mix and grind them with a planetary ball mill for 24 hours, take them out, and dry them at 100°C;

[0040] 3) Pass the powder in step 2) through a 100-mesh sieve, put it into a corundum crucible and place it in a muffle furnace, pre-fire at 1100°C for 1 hour, and cool to room temperature with the furnace

[0041] 4) Take out the powder in step 3) and put in 0.001mol Al 2 o 3 , 0.002mol MnO 2 and 0.03mol nano-SiO 2 , and then put it into an agate jar for ball milling for 10 hours, take it out and dry it, and pass through a 100-mesh sieve.

[0042] 5) Add the powder in step 4) to granulate with polyvinyl alcohol aqueous solution (concentration 1at%), the amount of polyvinyl ...

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Abstract

The invention discloses a low-absorption / emission ratio self-adaptive temperature-control material and belongs to the field of novel materials. The material comprises a component of BayAxTiO3, whereinA is one or more of Sr, Sn, Ca, La, Nb and Y; x+y=1. The invention further discloses a preparation method of the material. The infrared emission rate of the obtained material is changed near a curiepoint along with external thermal environment change, an intelligent self-adaptive thermal control material prepared according to the method has a low solar absorption rate, that is, as is less than 0.3, by virtue of the property that the material is large in infrared emission rate change amplitude, that is, delta eH is greater than 0.2, the material can be widely applied to fields such as thermalcontrol systems of aircrafts, energy conservation and emission reduction of buildings, heat radiation of electronic equipment and infrared stealth and tactical weapons, and particularly has great practical values and application prospects in fields such as energy conservation and emission reduction of buildings, heat radiation of electronic equipment and thermal control of aircrafts.

Description

technical field [0001] The invention belongs to the field of new materials, and specifically refers to a low absorption / emission ratio adaptive temperature control material and a preparation method thereof. Background technique [0002] Intelligent temperature-controlled materials refer to the material itself, under the excitation of different ambient temperatures, realizes a sudden change in infrared emissivity through a jump in its own structural physical properties, and adaptively changes its thermal radiation performance, with the characteristics of warm in winter and cool in summer. Air conditioning function. Intelligent temperature control materials have great application prospects in the fields of national defense technology and civil energy saving and emission reduction. It can be widely used in spacecraft thermal control, building energy saving, smart glass / window, engine cooling, electronic product cooling, LED lamp cooling and other fields. The material technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3208C04B2235/3213C04B2235/3225C04B2235/3227C04B2235/3251C04B2235/3293C04B2235/5445
Inventor 吕金鹏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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