Author/Authors :
Li, Junping Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Jin, Enze Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Ma, Denghao Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Yuan, Zeshuai Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Sun, Wenting Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Wang, Hao Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Zhang, Jiajia Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Gong, Xiaodong Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Huang, Lina Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Han, Botao Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Sun, Xin Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China , Feng, Zhihai Key Laboratory of Advanced Functional Composites Technology - Aerospace Research Institute of Materials & Processing Technology - Beijing , China
Abstract :
Here, we show that when the oxidation treatment temperature exceeded 600°C, the tensile strength of SiC/SiC begins to decrease.Oxidation leads to the damages on the PyCfiber/matrix interface, which is replaced by SiO2at higher temperature. The fracturemode converts fromfiber pull-out tofiber-break as thefiber/matrix interface isfilled with SiO2. Oxidation time also plays animportant role in affecting the tensile strength of SiC/SiC. The tensile modulus decreases with temperature from RT to 800°C,then increases above 800°C due to the decomposition of remaining CSixOyand crystallization of the SiC matrix. A specialsurface densification treatment performed in this study is confirmed to be an effective approach to reduce the oxidationdamages and improve the tensile strength of SiC/SiC after oxidation.
Keywords :
Influence , Oxidation Damages , Mechanical Properties , SiC/SiC Composite , Using Domestic Hi-Nicalon Type SiC Fibers , SiC/SiC
