Densification, β→α transformation and nanoindentation studies of SiCW/SiC composites fabricated by spark plasma sintering

Polycarbosilane-derived SiC W /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 s...

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Bibliographic Details
Published in:Hanʼguk Seramik Hakhoe chi 2024, Vol.61 (4), p.644-653
Main Authors: Lodhe, Mangesh, Bhargav, Amit, Wasan, Awin, Logesh, G., Parmar, Rajeev, Balasubramanian, M.
Format: Article
Language:English
Subjects:
Ceramics
Chemistry and Materials Science
Composites
Glass
Materials Science
Natural Materials
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Summary:Polycarbosilane-derived SiC W /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 β → α 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% SiC W /SiC composite. Nanoindentation study reflects the positive effect of whiskers on hardness and elastic modulus.
ISSN:1229-7801
2234-0491
DOI:10.1007/s43207-024-00384-y