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《China Surface Engineering》 2010-05
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Characterization of the Microstructure of Atmosphere Plasma-sprayed Mullite Powders and Coatings

AN Yu-long1,2,CHEN Jian-min1,ZHOU Hui-di1,WEI Jia-jun3 (1.State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000 2.Graduate School of Chinese Academy of Science,Beijing 100049 3.Gansu Zixin Mining Industry and Coal Chemistry Industry Company Ltd.,Lanzhou 730000)  
The spray-dried and plasma spheroidization mullite powders were prepared.The particle size distributions for these powders were analyzed by using a laser diffraction analyzer.The mullite coating was prepared by atmospheric plasma spraying.Microstructure and phase composition of the powders and as-sprayed coatings were investigated by means of scanning electron microscopy and X-ray diffraction.It has been found that the spray-dried and plasma spheroidization mullite powders were normalized size distribution;the spray-dried mullite powders included SiO2 and crystal mullite phase,however,the amorphous glass phase were appeared in plasma spheroidization mullite powders.The result also showed that the surface of smaller particles of plasma spheroidized mullite powders were melted fully,but the bigger particles of those powders were partial melted.The as-aprayed mullite coatings have good morphology and high microhardness.The amorphous phase in the as-sprayed mullite coating was changed to crystalline mullite,and partly cristobalite was precipitated after heat treatment.
【Fund】: 国家973计划资助项目(2007CB607601)
【CateGory Index】: TG174.442
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