Preparation and tensile behavior of SiCf/SiC minicomposites with (PyC/SiC)n multilayered interphases
YANG Ping1, ZHANG Ruiqian2, LI Yue1, CHEN Zhaoke1, HE Zhongbei2, LIU Guiliang2, FU Daogui2, SUN Wei1, WANG Yalei1, XIONG Xiang1
1. Key Laboratory of Lightweight, High Strength Structural Materials, Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; 2. Reactor Fuel and Materials Laboratory, uclear Power Institute of China, Chengdu 610213, China
Abstract (PyC/SiC)4 or (PyC/SiC)8 multi-layer interphases were introduced into two types of SiC fiber bundles by CVI method and further densified with SiC to obtain SiCf/SiC minicomposites. The effects of fiber types and interface types on mechanical properties and fracture mechanism of SiCf/SiC minicomposites were studied. The results show that, the densified SiCf/SiC minicomposite is a whole. In the minicomposites, a clear interface layer with an uniform thickness can be observed between fiber and matrix. The maximum tensile strength of A/(PyC/SiC)4/SiC, B/(PyC/SiC)4/SiC and A/(PyC/SiC)8/SiC minicomposites are 466, 350 and 330 MPa respectively, with the ultimate tensile strain of 0.519%, 0.219% and 0.330%, respectively. In addition, the fracture morphologies of minicomposites and the length of pull-out fiber with different types of reinforced fiber and interface are quite different, indicated a different fracture mode. The A/(PyC/SiC)4/SiC fractures in Model Ⅱ, B/(PyC/SiC)4/SiC and A/(PyC/SiC)8/SiC fracture in ModelⅠ.
YANG Ping,ZHANG Ruiqian,LI Yue, et al. Preparation and tensile behavior of SiCf/SiC minicomposites with (PyC/SiC)n multilayered interphases[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 553-561.
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2018, Vol. 23 
