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Thermo-chromatic infrared emitting ability ceramic sheet material and preparation method thereof

A technology of infrared emissivity and ceramic flakes, which is applied in the field of functional materials, can solve the problems of high cost and complex structure of electrovariable infrared emissivity materials, and achieve the effects of low cost, high strength and high reliability

Inactive Publication Date: 2011-08-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The infrared emissivity materials currently researched at home and abroad mainly include two types: electric and thermal. Among them, the electrovariable emissivity materials are mainly conductive polymers such as polyaniline and polythiophene, and material systems such as tungsten trioxide. Among them, organic The system can achieve a large emissivity variation range (greater than 0.5), while the emissivity variation range achieved by the tungsten trioxide system does not exceed 0.3; due to the need for an external field excitation source, the structure of the electrovariable infrared emissivity material is relatively complicated and the cost is relatively high. high

Method used

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  • Thermo-chromatic infrared emitting ability ceramic sheet material and preparation method thereof
  • Thermo-chromatic infrared emitting ability ceramic sheet material and preparation method thereof
  • Thermo-chromatic infrared emitting ability ceramic sheet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] La 0.825 Sr 0.175 MnO 3 The preparation of thermally variable infrared emissivity ceramic sheet material comprises the following steps:

[0027] Step 1: According to the molar ratio of metal substances in the molecular formula, weigh 26.879 grams of high-purity La 2 o 3 , 5.1667 g SrCO 3 , 22.988 g MnCO 3 , plus 8.255 grams of 2-hydroxypropanetricarboxylic acid and 27.517 grams of pure water, ball milled for 4 to 7 hours and then dried.

[0028] Step 2: Pre-calcination: put the dried precursor into a calcination furnace, and calcine it at 700-1000°C for 4-7 hours at a heating rate of 5°C-10°C / min, and then cool down with the furnace.

[0029] Step 3: Sintering: Ball mill the obtained calcined product in ethanol for 2-4 hours, dry it, raise the temperature (10-20°C / min) to 900-1450°C, heat-preserve and calcinate for 3-5 hours, and cool down naturally to obtain La 1-x Sr x MnO 3 (0.1≤x≤0.3) Sintered powder.

[0030] Step 4: Preparation of green ceramic sheet: An...

Embodiment 2

[0036] La 0.775 Sr 0.225 MnO 3 The preparation of thermally variable infrared emissivity ceramic sheet material comprises the following steps:

[0037] Step 1: According to the molar ratio of metal substances in the molecular formula, weigh high-purity La 2 o 3 25.25 g, SrCO 3 6.6429 g, MnCO 3 22.988 grams, plus 8.232 grams of 2-hydroxypropanetricarboxylic acid and 27.44 grams of pure water, dried after ball milling for 4 to 7 hours.

[0038] Steps 2 to 6 are similar to steps 2 to 6 of Example 1, and finally La 0.775 Sr 0.225 MnO 3 Thermally variable infrared emissivity ceramic sheet material, the sample is determined by the Philips X'Pert Pro Mpd X-ray diffractometer in the Netherlands to determine the phase structure, and the Tensor27 Fourier infrared spectrometer of Bruker Spectroscopy Instrument Company is used to measure its temperature at 173K, 193K, Infrared reflectivity of 213K, 233K, 253K, 273K, 283K, 303K, 323K, 343K, 363K and 373K, and calculate the emissiv...

Embodiment 3

[0040] La 0.75 Sr 0.25 MnO 3 The preparation of thermally variable infrared emissivity ceramic sheet material comprises the following steps:

[0041] Step 1: According to the molar ratio of metal substances in the molecular formula, weigh high-purity La 2 o 3 24.436 g, SrCO 3 7.381 g, MnCO 3 22.988 grams, plus 8.221 grams of 2-hydroxypropanetricarboxylic acid and 27.403 grams of pure water, dried after ball milling for 4 to 7 hours.

[0042] Steps 2 to 6 are similar to steps 2 to 6 of Example 1, and finally La 0.75 Sr 0.25 MnO 3 Thermally variable infrared emissivity ceramic sheet material, the sample is determined by the Philips X'Pert Pro Mpd X-ray diffractometer in the Netherlands to determine the phase structure, and measured by the Tensor27 Fourier infrared spectrometer (additional mid-infrared integrating sphere) of Bruker Spectrum Instruments Its infrared reflectance at 173K, 193K, 213K, 233K, 253K, 273K, 283K, 303K, 323K, 343K, 363K and 373K temperature points...

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Abstract

The invention provides a thermo-chromatic infrared emitting ability ceramic sheet material and a preparation method thereof, belonging to the technical field of function materials. The thermo-chromatic infrared emitting ability ceramic sheet material is a La1-xSrxMnO3 system ceramic sheet material with a perovskite structure. The preparation method of the material comprises the steps of mixing 2-hydroxy tricarballylic acid and pure water into raw materials of La2O3, SrCO3 and MnCO3 with a certain mole ratio, performing ball milling, and drying the mixture to obtain a presoma; presintering the presoma under the temperature of 700-1000DEG C, performing ball milling and frying again, and sintering under the temperature of 900-1450DEG C to obtain sintering powder; and rolling into a raw ceramic sheet, gluing, and sintering under the temperature of 900-1200DEG C to obtain a final product. The infrared emitting ability of the thermo-chromatic infrared emitting ability ceramic sheet material is improved with the increase of the temperature, so that the infrared emitting ability saltation near a room temperature can be realized, and the maximum variation range of the emitting ability reaches 0.47. Meanwhile, the material has the advantages of being high in reliability, free of power consumption and light in weight, can meet the thermal control requirement of micro-satellites, and can be widely used in technical fields of infrared camouflage and energy conservation.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a thermally variable infrared emissivity material and a preparation method thereof, specifically a lanthanum strontium manganese oxide (La strontium oxide) with a perovskite structure. 1-x Sr x MnO 3 ) system thermally variable infrared emissivity ceramic sheet material and its preparation method. Background technique [0002] Thermally variable infrared emissivity material is a functional material that can independently adjust its own infrared radiation performance according to changes in ambient temperature. This type of material adopts a passive working mode and does not require an additional external field excitation source, so it has a simple structure, light weight, and is conducive to Material-device integrated design and other advantages. [0003] Due to the self-adjustment of the infrared emissivity (or thermal radiation) of thermotropic infrared emissivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/622
Inventor 翁小龙卞鹏邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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