Tunable strength of SiCf/β-Yb_(2)Si_(2)O_(7) interface for different requirements in SiCf/SiC CMC:Inspiration from model composite investigation  

作　　者：Xirui Lv Mengkun Yue Wenfan Yang Xue Feng Xiaoyan Li Yumin Wang Jiemin Wang Jie Zhang Jingyang Wang 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]AML,Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China [4]Center for Mechanics and Materials,Tsinghua University,Beijing 100084,China [5]Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China

出　　处：《Journal of Materials Science & Technology》2021年第8期165-173,共9页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China under Grant No.2017YFB0703201;Natural Science Foundation of China under Grant No.51772302;CAS International Cooperation Key Program under Grant No.174321KYSB20180008。

摘　　要：Model composites consisting of Si C fiber embedded inβ-Yb_(2)Si_(2)O_(7) matrix were processed by Spark Plasma Sintering method and the feasibility of tunable Si Cf/Yb_(2)Si_(2)O_(7) interface in Si C-based CMCs were estimated.Weak and strengthened Si Cf/Yb_(2)Si_(2)O_(7) interfaces were achieved by adjusting sintering temperatures.The indentation crack test and fiber push out experiments clearly demonstrated the different debonding mechanisms in the samples.Weak interfaces sintered at 1200 and 1250℃exhibited crack deflection at interface in indentation test.Their low debond energy at the interface,which were comparable to those of Py C or BN,satisfied the well-recognized interfacial debond and crack deflection criteria for CMCs.The interface was strengthened by atomic bonding in model composite sintered at 1450℃,leading to crack penetrating into Si C fiber and high debond energy.The strong interface may be promising in Si Cf/Si C CMC to withstand higher combustion temperature,because Yb_(2)Si_(2)O_(7) will provide plastic deformation capacity,which would serve as weak interphase for crack deflection and energy dissipation.Therefore,it is possible to design the capability of Si C_(f)/RE_(2)Si_(2)O_(7) interface for different requirements by adjusting interfacial strength or debond energy to reach optimal mechanical fuse mechanism in SiC_(f)/SiC CMC.

关 键 词：SiCf/SiC composite INTERPHASE Rare earth disilicate Tunable interface 

分 类 号：V250[一般工业技术—材料科学与工程] V263[航空宇航科学与技术—航空宇航制造工程] TB332