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Lanthanum strontium manganate (LSMO) -based intelligent thermal-radiating material and preparation method thereof

A strontium lanthanum manganate and heat radiation technology, applied in the field of strontium lanthanum manganate based intelligent heat radiation materials and its preparation, variable heat radiation ceramic materials and preparation, can solve spalling and cracks, coarse grains, and firing shrinkage Large and other problems, to achieve the effect of improving uniformity and flatness, shortening sintering time, and reducing sintering temperature

Inactive Publication Date: 2010-06-16
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite ceramic sheet developed in the third stage has high strength (ZrO 2 The strength and toughness of ceramics is higher than that of strontium-lanthanum manganate-based ceramics) and light weight, but there are two problems: 1) Since the film of strontium-lanthanum manganate-based ceramics is thin (20 μm), if the traditional solid-state reaction method is used Powder, powder grains are coarse (up to 5 μm or more), resulting in poor uniformity and low flatness of the ceramic film; 2) Due to the small external force applied during the screen printing film forming process, the solvent and binder The content is more, so the firing shrinkage is also larger, which makes it difficult to combine with dense ZrO in the sintering process. 2 The shrinkage rate of the matrix is ​​coordinated, and it is easy to peel off and crack
The above two problems are currently the bottlenecks in the preparation of lightweight, high-strength ZrO2-LSMO-based composite ceramic sheets

Method used

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  • Lanthanum strontium manganate (LSMO) -based intelligent thermal-radiating material and preparation method thereof
  • Lanthanum strontium manganate (LSMO) -based intelligent thermal-radiating material and preparation method thereof
  • Lanthanum strontium manganate (LSMO) -based intelligent thermal-radiating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Press La 0.83 Sr 0.17 MnO 3 Chemical dosage ratio stock. Take 0.415 moles of La(NO 3 ) 3.6H 2 O, 0.085 mol Sr(NO 3 ) 2 and 0.5 mol Mn(NO 3 ) 2 .6H 2 O was dissolved in 1000 ml of deionized water, 1 vol.% of ammonium citrate, acrylamide and NN'-methacrylamide were added, and ultrasonically stirred at 80°C for 2 hours to form a transparent sol. The sol was placed in an oven for heat treatment at 150° C. for 4 hours to evaporate the moisture and obtain a xerogel. After the above xerogel was ground into fine powder in an agate bowl, it was degummed in a box-type resistance furnace at 350°C for 2.5h and calcined at 950°C for 1h to obtain La 0.83 Sr 0.17 MnO 3 Powder, the XRD analysis results and TEM morphology of the powder are as follows: Figure 1-a and Figure 1-b shown. It can be seen from the figure that the powder has a single-phase perovskite structure, and the particle size of a single crystal is 60nm.

[0058] La 0.83 Sr 0.17 MnO 3 Ceramic powder ...

Embodiment 2

[0060] Press La 0.84 Sr 0.16 MnO 3 Chemical dosage ratio stock. Take 0.42 moles of La(NO 3 ) 3 .6H 2 O, 0.08 mol Sr(NO 3 ) 2 and 0.5 mol Mn(NO 3 ) 2 .6H 2 O was dissolved in 1000 ml of deionized water, 5 vol.% of ammonium citrate, acrylamide and NN'-methacrylamide were added, and ultrasonically stirred at 80°C for 3 hours to form a transparent sol. The sol was placed in an oven and heat-treated at 100° C. for 5 hours to evaporate moisture and obtain a xerogel. After the above xerogel was ground into fine powder in an agate bowl, it was degummed in a box-type resistance furnace at 250°C for 2.5 hours and calcined at 800°C for 4 hours to obtain La 0.84 Sr 0.16 MnO 3 Powder.

[0061] La 0.84 Sr 0.16 MnO 3 Ceramic powder is mixed with PMAA (dispersant), PVA (bonding agent), PEG (plasticizer), Agitan280 (defoamer) and deionized water, wherein the volume percentage of ceramic powder is 50vol.%; The volume percentage of ionized water is 45%; various additives PMAA, ...

Embodiment 3

[0063] Press La 0.82 Sr 0.18 MnO 3 Chemical dosage ratio stock. Take 0.41 moles of La(NO 3 ) 3 .6H 2 O, 0.09 mol Sr(NO 3 ) 2 and 0.5 mol Mn(NO 3 ) 2 .6H 2 O was dissolved in 1000 ml of deionized water, 3 vol.% of ammonium citrate, acrylamide and NN'-methacrylamide were added, and ultrasonically stirred at 80°C for 1 hour to form a transparent sol. The sol was placed in an oven for heat treatment at 150° C. for 2 hours to volatilize the water and obtain a xerogel. After the above xerogel was ground into fine powder in an agate bowl, it was degummed in a box-type resistance furnace at 400°C for 2.5h and calcined at 1100°C for 1h to obtain La 0.82 Sr 0.18 MnO 3 Powder.

[0064] La 0.82 Sr 0.18 nO 3 Ceramic powder is mixed with PMAA (dispersant), PVA (bonding agent), PEG (plasticizer), Agitan280 (defoamer) and deionized water, wherein the volume percentage of ceramic powder is 35.5vol.%. The volume percentage of deionized water is 60vol.%; various additives PMAA,...

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Abstract

The invention relates to variable thermal-radiating ceramic material and preparation method thereof, in particular to lanthanum strontium manganate (LSMO) -based intelligent thermal-radiating material and preparation method thereof. The lanthanum strontium manganate-based intelligent thermal-radiating material comprises the following components in proportion: La1-xSrxMnO3, wherein x=0.16-0.18; or La1-xCaxMnO3, wherein x=0.20-0.40; or La1-(x1+x2)Srx1Cax2nO3, wherein x1=0.10-0.13 and x2=0.09-0.11.By adopting a sol-gel method to prepare the superfine LSMO-based ceramic powder the granularity of which is less than 100nm, the invention lowers the sintering temperature, shortens the sintering time, improves the uniformity and the flatness of the LSMO-based complex ceramic film and decreases the sintering defect; and simultaneously, the invention reduces the probability that the LSMO-based complex ceramic film strips from a ZrO2 substrate, and reduces the probability that the complex film cracks in the sintering process.

Description

technical field [0001] The invention relates to a variable heat radiation ceramic material and a preparation method, in particular to a strontium lanthanum manganate-based intelligent heat radiation material and a preparation method thereof. The material is especially suitable for the outer surface of the aircraft and its accessories, such as antennas and solar panel arrays. It can ease the temperature difference between the cold and the heat of the aircraft and the above-mentioned components, thereby ensuring the normal operation of the internal equipment and components of the aircraft, and reducing the thermal stress and deformation of its external accessories caused by the temperature difference. It belongs to the field of thermal control ceramics. Background technique [0002] The thermal environment of a spacecraft is one of the harshest space environments encountered by a spacecraft. In different orbits and different periods of spacecraft flight, the heat emitted by i...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622
Inventor 董桂霞杨志民马书旺崔建东
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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