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Rare earth composite oxide porous high-entropy ceramic as well as preparation method and application thereof
The invention provides rare earth composite oxide porous high-entropy ceramic as well as a preparation method and application thereof, and relates to the technical field of high-entropy ceramic. The chemical formula of the porous high-entropy ceramic is A2B2O7, A is a rare earth ion, and B is a tetravalent metal ion. In the A2B2O7 high-entropy component, a plurality of phonon scattering mechanisms are introduced, different rare earth elements exist in high-entropy ceramic crystal lattices, so that phonon scattering centers are increased, the Rattler effect existing in small elements and phonon scattering increase caused by ordered-disordered conversion are achieved, the thermal conductivity is low, and the thermal conductivity is high. And the rising amplitude of the heat conductivity from the low-temperature section to the high-temperature section is small. Besides, the A2B2O7 high-entropy component provided by the invention has a plurality of strengthening mechanisms, so that the A2B2O7 high-entropy component has relatively high intrinsic mechanical properties, and therefore, the rare earth composite oxide porous high-entropy ceramic has relatively high mechanical properties.
本发明提供了一种稀土复合氧化物多孔高熵陶瓷及其制备方法和应用，涉及高熵陶瓷技术领域。本发明提供的多孔高熵陶瓷，化学式为A2B2O7，A为稀土离子，B为四价金属离子。本发明的A2B2O7高熵组分中，引入多种声子散射机制，高熵陶瓷晶格中存在不同的稀土元素，导致声子散射中心增加，以及小元素存在的“Rattler”效应与有序‑无序转变中带来的声子散射增加，使得其表现出较低的热导率，从低温段到高温段热导率上升的幅度较小。另外，本发明提供的A2B2O7高熵组分中存在多种强化机制，使得其具有较高的本征力学性能，因此，所述稀土复合氧化物多孔高熵陶瓷具有较高的力学性能。
Rare earth composite oxide porous high-entropy ceramic as well as preparation method and application thereof
The invention provides rare earth composite oxide porous high-entropy ceramic as well as a preparation method and application thereof, and relates to the technical field of high-entropy ceramic. The chemical formula of the porous high-entropy ceramic is A2B2O7, A is a rare earth ion, and B is a tetravalent metal ion. In the A2B2O7 high-entropy component, a plurality of phonon scattering mechanisms are introduced, different rare earth elements exist in high-entropy ceramic crystal lattices, so that phonon scattering centers are increased, the Rattler effect existing in small elements and phonon scattering increase caused by ordered-disordered conversion are achieved, the thermal conductivity is low, and the thermal conductivity is high. And the rising amplitude of the heat conductivity from the low-temperature section to the high-temperature section is small. Besides, the A2B2O7 high-entropy component provided by the invention has a plurality of strengthening mechanisms, so that the A2B2O7 high-entropy component has relatively high intrinsic mechanical properties, and therefore, the rare earth composite oxide porous high-entropy ceramic has relatively high mechanical properties.
本发明提供了一种稀土复合氧化物多孔高熵陶瓷及其制备方法和应用，涉及高熵陶瓷技术领域。本发明提供的多孔高熵陶瓷，化学式为A2B2O7，A为稀土离子，B为四价金属离子。本发明的A2B2O7高熵组分中，引入多种声子散射机制，高熵陶瓷晶格中存在不同的稀土元素，导致声子散射中心增加，以及小元素存在的“Rattler”效应与有序‑无序转变中带来的声子散射增加，使得其表现出较低的热导率，从低温段到高温段热导率上升的幅度较小。另外，本发明提供的A2B2O7高熵组分中存在多种强化机制，使得其具有较高的本征力学性能，因此，所述稀土复合氧化物多孔高熵陶瓷具有较高的力学性能。
Rare earth composite oxide porous high-entropy ceramic as well as preparation method and application thereof
一种稀土复合氧化物多孔高熵陶瓷及其制备方法和应用
XU JIE (author) / WANG HENGCHANG (author) / WEI MINGYUE (author) / ZHU JIATONG (author) / YANG RUNWU (author) / MENG XUANYU (author) / GAO FENG (author)
2022-08-30
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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