Mechanical properties and surface characteristics of SiC fibers irradiated by swift heavy ions  

作　　者：Li-Qing Zhang Chong-Hong Zhang Chen-Chun Hao Guo-Dong Hu Zheng-Dong Feng Yong-Jian Tang Wen-Kun Zhu Jian-Yang Li Qing Huang 

机构地区：[1]Southwest University of Science and Technology,Mianyang 621010,China [2]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《Nuclear Science and Techniques》2022年第9期37-47,共11页核技术（英文）

基　　金：the National Natural Science Foundation of China(Nos.11675231,91426304);the Sichuan Science and Technology Program(No.2022YFG0263);the Scientific Research Starting Foundation for talents(Nos.21zx7109,21zx7110).

摘　　要：SiC fibers were irradiated by 414.4-MeV^(112)Sn^(27.3+)ions to different fluences(5.0×10^(12),6.0×10^(13),1.6×10^(14),and 1.92×10^(15)ions/cm^(2)).^(112)Sn^(27.3+)deposited its energy mainly via electron energy loss and passed through the SiC fiber.Then,the mechanical properties and surface characteristics of fibers were studied using a specific single filament tensile test and field emission scanning electron microscopy.Results revealed that the carbon concentration on the fiber surface increased while the silicon concentration decreased.Moreover,the addition of oxygen was found to correlate with an increase in ion fluence.Meanwhile,the fiber surface morphology of the least fluence(5.0×10^(12)ions/cm^(2))irradiated specimen displayed no obvious changes and its diameter was slightly reduced.With successive increases of ion fluence,large grains/bubbles on the fiber surface first appeared and then disappeared,and the diameter of fibers evidently increased.Moreover,at the highest fluence(1.92×10^(15)Sn ions/cm^(2))irradiated specimen,some fibers were brittle fractured.As a result,the mean tensile strength and the average elastic modulus of the fibers generally decreased with respect to the ion fluence.The degradation mechanisms of mechanical properties of SiC fibers under irradiation are discussed in detail.

关 键 词：SiC fibers Swift-heavy-ion irradiation FE SEM Tensile test 

分 类 号：TQ343.6[化学工程—化纤工业]