Owing to its excellent high-temperature resis-tance and high conductivity,zirconium diboride(ZrB2)has been applied as an infrared suppression coating.However,ZrB2 is susceptible to hydrolysis under high-moisture conditions and even under mild working temperatures.The improvement in the hydrophobicity of the ZrB2 surface effectively reduces wetting by water and suppresses hydrolysis reaction,particularly under high-temperature and high-moisture conditions.Herein,we report a novel,easy,and highly reproducible method for producing a fully coated ZrB2 surface by developing a nanoscale hydrophobic layer of glassy LaF3 on the surface of ZrB2 powder particles in situ(i.e.,during the carbothermal synthesis of ZrB2).Through the tests carried out at 200℃for 100-300 h in a hydrothermal reactor,the produced powders displayed remarkably high long-term hydrolysis resistance and pronounced chemical stability.Compared with treated ZrB2,ZrB2@LaF3 remained lower infrared emissivity when continuously intensifying hydrolyzation process.The results suggest that a nanoscale surface modification strategy can be applied to stabilize the infra-red emissivity of ZrB2 in a water-oxygen coupling envi-ronment.

Xue-Jing Xing;Xian Jian;Lin-Bo Zhang;Hai-Peng Lu;Zhong-Wei Zhang;Simeon Agathopoulos;Liang-Jun Yin;Long-Jiang Deng

School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China;The Yangtze Delta Region Institute(Huzhou),University of Electronic Science and Technology of China,Huzhou 313001,China;National Engineering Research Center of Electromagnetic Radiation Control Materials,University of Electronic Science and Technology of China,Chengdu 611731,China;Laboratory of Energy Storage and New Energy Materials Technology,Central Research Institute,Dongfang Electric Corporation,Chengdu 611731,China;Department of Materials Science and Engineering,University of Ioannina,Ioannina 451 10,Greece

稀有金属（英文版）

[1]Xue-Jing Xing;Xian Jian;Lin-Bo Zhang;Hai-Peng Lu;Zhong-Wei Zhang;Simeon Agathopoulos;Liang-Jun Yin;Long-Jiang Deng-.Strategy to boost hydrolysis resistance and stabilize low infrared emissivity of ZrB2 via nanoscale LaF3 surface modification)[J].稀有金属（英文版）,2022(12):4164-4175

diboride

Strategy,boost,hydrolysis,resistance,stabilize,infrared,emissivity,ZrB2,via,nanoscale,LaF3,surface,modification,Owing,its,excellent,conductivity,zirconium,has,been,applied,suppression,coating,However,susceptible,under,moisture,conditions,even,mild,working,temperatures,improvement,hydrophobicity,effectively,reduces,wetting,by,water,suppresses,reaction,particularly,Herein,report,novel,easy,highly,reproducible,method,producing,fully,coated,developing,layer,glassy,particles,situ,during,carbothermal,synthesis,Through,tests,carried,out,hydrothermal,reactor,produced,powders,displayed,remarkably,long,term,pronounced,chemical,stability,Compared,treated,remained,lower,when,continuously,intensifying,hydrolyzation,process,results,suggest,that,strategy,can,oxygen,coupling,envi,ronment

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