A nano-laminated Y3Si2C2 ceramic material was successfully synthesized via an in situ reaction between YH2 and SiC using spark plasma sintering technology. A MAX phase-like ternary layered structure of Y3Si2C2 was observed at the atomic-scale by high resolution transmission electron microscopy. The lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical results. The nano-laminated fracture of kink boundaries, delamination, and slipping were observed at the tip of the Vickers indents. The elastic modulus and Vickers hardness of Y3Si2C2 ceramics (with 5.5 wt% Y2O3) sintered at 1500 °C were 156 and 6.4 GPa, respectively. The corresponding values of thermal and electrical conductivity were 13.7 W·m-1·K-1 and 6.3×105 S·m-1, respectively.
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We would like to appreciate the support from the Ningbo 3315 Innovative Teams Program, China (Grant No. 2019A-14-C). This study was supported by the National Natural Science Foundation of China (Grant Nos. 11975296 and 51811540402).
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Shi, LK., Zhou, X., Dai, JQ. et al. Microstructure and properties of nano-laminated Y3Si2C2 ceramics fabricated via in situ reaction by spark plasma sintering. J Adv Ceram 10, 578–586 (2021). https://doi.org/10.1007/s40145-021-0459-0
- rare earth silicide carbides
- spark plasma sintering (SPS)
- ternary layered structure ceramic