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《Journal of Functional Materials》 2016-03
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Mechanism for the effect on synthesis of AlN from Al_2O_3+C activated by plasma assisted ball milling during solid-state reaction

DAI Leyang;GUO Xueping;YAN Jin;ZHANG Baojian;LIU Zhijie;WANG Wenchun;Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,Institute of Marine engineering,Jimei University;Fujian Engineering Research Center of Marine Engine Detecting and Remanufacturing;Key Lab of Materials Modification(Dalian University of Technology),Ministry of Education;  
Synthesis mechanism of AlN by Al_2O_3+C powders through carbothermic reduction reaction was investigated,in which the Al_2O_3+C powders was activated by plasma assisted ball milling(PM)or by conventional ball milling(CM).The results indicate that Al_2O_3+C powders activated by 30 hof plasma assisted ball milling can be converted to AlN totally through carbothermic reduction reaction when annealed at 1 400 ℃for4hin N2.It is solid state reaction mechanism for the carbothermic reduction reaction of Al_2O_3+C powders after plasma assisted ball milling.Compared to Al2O3 powders,the time for activation of Al_2O_3+C powders by plasma assisted ball milling is reduced 10 h mainly because a homogeneous miscible mixture was formed between Al_2O_3 and C phases.As a result of the cooperation of plasma and ball milling,the subsequent carbothermic reduction reaction of Al_2O_3+C in solid state is promoted kinetically due to the homogeneous composite structures which increase the reaction diffusion channels and shorten the average diffusion length significantly.
【Fund】: 国家自然科学基金资助项目(51177008);; 交通运输部应用基础研究资助项目(2015329815220);; 福建省自然科学基金资助项目(2013J01202);; 福建省科技计划资助项目(2016H6017);; 福建省科技创新平台建设资助项目(2014H2001);; 厦门南方海洋研究中心资助项目(14GZB66NF30)
【CateGory Index】: TQ133.1
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