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Microstructural evolution and mechanical properties of in situ nano Ta_(4)HfC_(5) reinforced SiBCN composite ceramics

查看全文 作　　者：Bingzhu [1,2]WANG;Daxin [1,2]LI;Zhihua [1,2,3]YANG;Dechang [1,2,3]JIA;Jingyi [1,2]GUAN;Hao [1,2]PENG;Delong [1,2]CAI;Peigang [1,2]HE;Xiaoming [1,2]DUAN;Yu [1,2]ZHOU;Tao [4]ZHANG;Chenguang [4]GAO 高影响力作者 机构地区：[1]Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;[2]Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology,Harbin Institute of Technology,Harbin 150001,China;[3]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;[4]Beijing Institute of Control Engineering,Beijing 100080,China高影响力机构 出　　处：《Journal of Advanced Ceramics》索引2020年第9卷第6期,共10页高影响力期刊 基　　金：the financial support from the National Natural Science Foundation of China(52002092,51621091,51472059,51225203,and 51272300);the National Key Research and Development Program(2017YFB0310400);the Postdoctoral Innovative Talents Support Program(BX20190095);the China Postdoctoral Science Foundation(Grant Nos.LBH-Z19141 and 2019M660072);funded by Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research center of Efficient and Green Aerospace Propulsion Technology(No.LabASP-2019-08). 摘　　要：The in situ nano Ta_(4)HfC_(5) reinforced SiBCN-Ta_(4)HfC_(5) composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering.The microstructural evolution and mechanical properties of the resulting SiBCN-Ta_(4)HfC_(5) were studied.After the first-step milling of 30 h,the raw materials of TaC and HfC underwent crushing,cold sintering,and short-range interdiffusion to finally obtain the high pure nano Ta_(4)HfC_(5).A hybrid structure of amorphous SiBCN and nano Ta_(4)HfC_(5) was obtained by adopting a second-step ball-milling.After reactive hot-pressing sintering,amorphous SiBCN has crystallized to 3C-SiC,6H-SiC,and turbostratic BN(C)phases and Ta_(4)HfC_(5) retained the form of the nanostructure.With the in situ generations of 2.5 wt% Ta_(4)HfC_(5),Ta_(4)HfC_(5) is preferentially distributed within the turbostratic BN(C);however,as Ta_(4)HfC_(5) content further raised to 10 wt%,it mainly distributed in the grain-boundary of BN(C) and SiC.The introduction of Ta_(4)HfC_(5) nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics,reaching to 344.1 MPa and 4.52 MPa·m^(1/2),respectively.This work has solved the problems of uneven distribution of ultra-high temperature phases in the ceramic matrix,which is beneficial to the real applications of SiBCN ceramics. 关 键 词：Ta_(4)HfC_(5) SiBCN microstructure evolution mechanical properties
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