期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 5, 页码 3061-3071出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.09.043
关键词
C; C-SiC; Mechanical properties; High temperature; Hysteresis measurement; Liquid silicon infiltration (LSI)
The effects of temperature on the mechanical properties of Liquid Silicon Infiltration based continuous carbon fiber reinforced silicon carbide were studied. Tensile properties were determined at high temperatures, showing almost no permanent strain compared to room temperature tests. Different fracture mechanisms were confirmed by analyzing the fracture surface, and a modeling approach for predicting material behavior at high temperature was developed with good agreement between test and modeling results.
In order to study the effects of temperature on the material behavior of Liquid Silicon Infiltration (LSI) based continuous carbon fiber reinforced silicon carbide (C/C-SiC), the mechanical properties at room temperature (RT) in in-plane and out-of-plane directions are summarized and the tensile properties of C/C-SiC were then determined at high temperature (HT) 1200 degrees C and 1400 degrees C under quasi static and compliance loading. The stressstrain response of both HT tests is similar and almost no permanent strain can be observed compared to the RT, which can be explained through the relaxation of residual thermal stresses and the crack distribution under various states. The different fracture mechanisms are confirmed by the analysis of fracture surface. Furthermore, based on the analysis of hysteresis measurements at RT, a modeling approach for the prediction of material behavior at HT has been developed and a good agreement between test and modeling results can be observed.
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