Abstract
Polycarbosilane-derived SiCW/SiC composites were processed by spark plasma sintering (SPS). Whisker-reinforced composites were densified with faster rates to a maximum density of ~ 98%, indicative of positive influence of SiC whiskers on densification behavior. Electron backscattered diffraction study confirmed the presence of twins in the sintered composites. A misorientation angle of 60° resembled to {111} twin boundaries. Twin density was found to increase with SPS temperature and whisker contest. Twin boundaries were found to be responsible for \({\beta} \to {\alpha}\) SiC transformation. Hardness increased sharply with the increase in whisker content and a decrease in grain size. The maximum hardness of 23.4 GPa was observed in 20% SiCW/SiC composite. Nanoindentation study reflects the positive effect of whiskers on hardness and elastic modulus.
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The authors are thankful to Dr. Devinder Yadav (IIT Patna) for carrying out EBSD experimentation and analysis.
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Lodhe, M., Bhargav, A., Wasan, A. et al. Densification, \({\beta} \to {\alpha}\) transformation and nanoindentation studies of SiCW/SiC composites fabricated by spark plasma sintering. J. Korean Ceram. Soc. (2024). https://doi.org/10.1007/s43207-024-00384-y
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DOI: https://doi.org/10.1007/s43207-024-00384-y