Microstructure and Mechanical Properties of Low Oxygen Content SiC Fibers in Simulated Aeroengine Circumstance

Journal of Aeronautical Materials

LI Liang¹  MAO Xianhe¹  YUAN Xiaoning¹  WANG Yifei²  JIAN Ke² 

[1] Northwest Institute of Nuclear Technology, Xi’an 710024, China;Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, National University of Defense Technology, Changsha 410073, China;

关键词: low oxygen content;    SiC fibers;    aeroengine;    oxide layer;    crystallization;   

DOI  :  10.11868/j.issn.1005-5053.2017.000093

来源: DOAJ

【 摘 要 】

The low oxygen content SiC fibers were exposed in simulated aeroengine circumstance of \begin{document}${P_{{{\rm{H}}_2}{\rm{O}}}}:{P_{{{\rm{O}}_2}}}:{P_{{\rm{Ar}}}} = $\end{document}14 kPa \begin{document}$:8$\end{document} kPa \begin{document}$:78$\end{document} kPa at 1200 ℃ for 1-50 h. Performances and structure of the fibers were characterized by element analysis, XRD, SEM and tensile test. The results show that the fibers have higher oxygen content, thicker oxide layer, lower strength compared with the fibers treated in dry air. Cracks and α-SiO₂ crystal are more likely to occur in silica layer. The steam in the simulated circumstance can accelerate oxidation and crack formation in silica film.

【 授权许可】

Unknown