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J. Korean Ceram. Soc. > Volume 58(1); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(1): 86-93.
doi: https://doi.org/10.1007/s43207-020-00074-5
Crack healing in the SiC–SiC ceramic matrix composites fabricated with different process
Zicheng Meng1, Tae Woo Kim1, Sung Min Lee2, Kee Sung Lee1
1School of Mechanical Engineering, Kookmin University, Seoul 02707, Korea
2Engineering Ceramics Team, Korea Institute of Ceramic Engineering Technology (KICET), Icheon 17303, South Korea
Correspondence  Kee Sung Lee ,Email: keeslee@kookmin.ac.kr
Received: March 27, 2020; Revised: May 29, 2020   Accepted: August 10, 2020.  Published online: January 31, 2021.
In this study, crack healing in a SiC–SiC ceramic matrix composite (CMC) was investigated. As a gas turbine often operates at a high temperature above 1350 °C and is frequently cooled to room temperature, small cracks that form in the interior of a hot gas component propagate to the surface of the component. Owing to a mechanical constraint condition and dynamic vibrations, stress concentration occurs at the cracks, which grow and eventually reduce the service life of the turbine component. Self-healing technology has been used to solve this problem. We studied the crack-healing behavior of plate-type SiC–SiC CMC samples prepared by liquid melt infiltration (LMI) and cylindrical SiC–SiC CMC samples produced by chemical vapor infiltration (CVI) in an experiment. First, a crack was deliberately formed on the surface of the samples through indentation. Subsequently, the sample was subjected to heat treatment, in which the crack-healing temperature and the healing time were controlled. The crack-healing regions on the surface of the samples were observed using a scanning electron microscope, and the composition of the crack-healing region was analyzed by energy-dispersive spectrometry. While the cracks in the SiC–SiC CMC samples prepared by CVI were healed at 1500 °C, those in the SiC–SiC CMC samples produced by LMI were healed at a lower temperature, 1400 °C, because of the oxidation of residual Si. The four-point bending test was performed at room temperature and a high temperature (1200 °C) on the SiC–SiC CMC samples prepared by LMI, and it confirmed the healing in the samples.
Key words: Coatings · Crack healing · Strength · Indentation
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