Oxidation behavior of amorphous and nanocrystalline SiBCN ceramics–Kinetic consideration and microstructure  

作　　者：Zibo Niu Daxin Li Dechang Jia Zhihua Yang Kunpeng Lin Ralf Riedel Paolo Colombo Yu Zhou 

机构地区：[1]Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150080,China [2]Key Laboratory of Advanced Structural-Function Integrated Materials and Green Manufacturing Technology,Ministry of Industry and Information Technology,Harbin 150080,China [3]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,150080,China [4]Chongqing Research Institute,Harbin Institute of Technology,Chongqing 401135,China [5]Institute of Materials Science,Darmstadt University of Technology,Otto-Berndt-Str.3,64287,Darmstadt,Germany [6]Department of Industrial Engineering,University of Padova,Via Marzolo,9,Padova,Italy [7]Department of Materials Science and Engineering,The Pennsylvania State University,University Park,PA 16802,United States [8]School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

出　　处：《Advanced Powder Materials》2024年第1期144-156,共13页先进粉体材料（英文）

基　　金：financially supported by the National Natural Science Foundation of China(Grant no.52002092,51832002,52172068,52232004,52372059);Heilong Jiang Natural Science Fund for Young Scholars(Grant no.YQ2021E017);National Key Research and Development Program of China(Grant no.2017YFB0310400);Heilongjiang Touyan Team Program,Advanced Talents Scientific Research Foundation of Shenzhen,and Fundamental Research Funds for the Central Universities(2022FRFK0600XX);RR gratefully acknowledges the financial support provided by the Research Training Group 2561“MatCom-ComMat:Materials Compounds from Composite Materials for Applications in Extreme Conditions”funded by the Deutsche Forschungsgemeinschaft(DFG),Bonn,Germany.

摘　　要：In this study,the structural evolution of SiBCN ceramics during crystallization and its effects on oxidation behavior involving different atomic units or formed phases in amorphous or crystalline SiBCN ceramics were analyzed.The amorphous structure has exceptionally high oxidation activity but presents much better oxidation resistance due to its synchronous oxidation of atomic units and homogeneous composition in the generated oxide layer.However,the oxidation resistance of SiBCN ceramic will degrade during the continual crystallization process,especially for the formation of the nanocapsule-like structure,due to heterogeneous oxidation caused by the phase separation.Besides,the activation energy and rate-controlling mechanism of the atomic units and phases in SiBCN ceramics were obtained.The BNCx(Ea=145 kJ/mol)and SiC(2-x)(Ea=364 kJ/mol)atomic units in amorphous SiBCN structure can be oxidized at relatively lower temperatures with much lower activation energy than the corresponding BN(C)(Ea=209 kJ/mol)and SiC(Ea=533 kJ/mol)phases in crystalline structure,and the synchronous oxidation of the SiC(2-x)and BNCx units above 750C changes the oxidation activation energy of BNCx(Ea=332 kJ/mol)to that similar to SiC(2-x).The heterogeneous oxide layer formed from the nanocapsule-like structure will decrease the activation energy SiC(Ea=445 kJ/mol)and t-BN(Ea=198 kJ/mol).

关 键 词：SiBCN ceramics AMORPHOUS Crystallization Oxidation Kinetics analysis 

分 类 号：TG1[金属学及工艺—金属学]