Fabrication, Microstructural Evolution, and Mechanical Properties of SiC/(Hf0.25Ta0.25Zr0.25Nb0.25)C/C Nanocomposites

A dense monolithic SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C high-entropy ceramic nanocomposite was prepared using a polymer-derived ceramic (PDC) method combined with spark plasma sintering (SPS). The microstructural evolution and mechanical properties of the obtained nanocomposites were characterized by X-ray diffractometer (XRD), transmission electron microscope (TEM), scanning-electron microscope (SEM), and nanoindentation. The results indicate that the phase composition of SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C can be adjusted by modifying the metal content of the single-source precursor (SSP) through molecular design. The resulting precursor exhibits an exceptionally high ceramic yield, with mass retention of over 90% at 1100 °C, which guarantees the densification of the final SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C composites. The PDC route facilitates the in situ formation of a high-entropy phase within the ceramic matrix under low temperature pyrolysis conditions. Combined with SPS, a dense monolithic SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C nanocomposite was obtained, exhibiting an open porosity of 0.41 vol%, nano-hardness of 27.47 ± 0.46 GPa, elastic modulus of 324.00 ± 13.60 GPa, and fracture toughness of 3.59 ± 0.24 MPa·m<sup>0.5</sup>, demonstrating excellent mechanical properties.

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Publication Details

Journal
Materials
Published
2024-10-31
DOI
https://doi.org/10.3390/ma17215294
Citations
3
Primary Topic
Advanced ceramic materials synthesis
Type
article
Field-Weighted Citation Impact
0.70

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article

Fabrication, Microstructural Evolution, and Mechanical Properties of SiC/(Hf0.25Ta0.25Zr0.25Nb0.25)C/C Nanocomposites

Zhaoju Yu, Xiantao Yang, Qingbo Wen, Zhenyue Wang et al.
3 citations
Materials
Advanced ceramic materials synthesis
0.70
article

Fabrication, Microstructural Evolution, and Mechanical Properties of SiC/(Hf0.25Ta0.25Zr0.25Nb0.25)C/C Nanocomposites

Zhaoju Yu, Xiantao Yang, Qingbo Wen, Zhenyue Wang, Yuenong Liu, Tianci Zhou
article en
3 citations

Abstract

A dense monolithic SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C high-entropy ceramic nanocomposite was prepared using a polymer-derived ceramic (PDC) method combined with spark plasma sintering (SPS). The microstructural evolution and mechanical properties of the obtained nanocomposites were characterized by X-ray diffractometer (XRD), transmission electron microscope (TEM), scanning-electron microscope (SEM), and nanoindentation. The results indicate that the phase composition of SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C can be adjusted by modifying the metal content of the single-source precursor (SSP) through molecular design. The resulting precursor exhibits an exceptionally high ceramic yield, with mass retention of over 90% at 1100 °C, which guarantees the densification of the final SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C composites. The PDC route facilitates the in situ formation of a high-entropy phase within the ceramic matrix under low temperature pyrolysis conditions. Combined with SPS, a dense monolithic SiC/(Hf<sub>0.25</sub>Ta<sub>0.25</sub>Zr<sub>0.25</sub>Nb<sub>0.25</sub>)C/C nanocomposite was obtained, exhibiting an open porosity of 0.41 vol%, nano-hardness of 27.47 ± 0.46 GPa, elastic modulus of 324.00 ± 13.60 GPa, and fracture toughness of 3.59 ± 0.24 MPa·m<sup>0.5</sup>, demonstrating excellent mechanical properties.

MaterialsVol. 17(21)
Central South University (CN), Xiamen University (CN)
National Natural Science Foundation of China
Openalex Percentile: Top 41%
Advanced ceramic materials synthesis
0.70
DOIOpen Access PDFOpenAlex
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