Yu, Zhaoju ; Yang, Yujing ; Mao, Kangwei ; Feng, Yao ; Wen, Qingbo ; Riedel, Ralf (2020)
Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles.
In: Journal of Advanced Ceramics, 9 (3)
doi: 10.1007/s40145-020-0371-z
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane (allylhydridopolycarbosilane, AHPCS) and tantalum(V) chloride (TaCl5), which was confirmed by Fourier transform infrared spectra (FTIR) measurement. After pyrolysis of the resultant single-source-precursors at 900 degrees C, amorphous ceramic powders were obtained. The 900 degrees C ceramics were annealed at different temperatures in the range of 1200-1600 degrees C to gain SiC-TaC-C nanocomposites. The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicate that the TaC starts to crystallize at lower temperature than the beta-SiC. It is particularly worth pointing out that the unique core-shell structured TaC@C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 degrees C. Even at a high temperature of 1600 degrees C, the grain sizes of beta-SiC and TaC are smaller than 30 nm, fulfilling the definition of nanocomposites. The present study related to SiC-TaC-C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Yu, Zhaoju ; Yang, Yujing ; Mao, Kangwei ; Feng, Yao ; Wen, Qingbo ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Single-source-precursor synthesis and phase evolution of SiC-TaC-C ceramic nanocomposites containing core-shell structured TaC@C nanoparticles |
| Sprache: | Englisch |
| Publikationsjahr: | Juni 2020 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Advanced Ceramics |
| Jahrgang/Volume einer Zeitschrift: | 9 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1007/s40145-020-0371-z |
| URL / URN: | https://link.springer.com/article/10.1007/s40145-020-0371-z |
| Kurzbeschreibung (Abstract): | A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane (allylhydridopolycarbosilane, AHPCS) and tantalum(V) chloride (TaCl5), which was confirmed by Fourier transform infrared spectra (FTIR) measurement. After pyrolysis of the resultant single-source-precursors at 900 degrees C, amorphous ceramic powders were obtained. The 900 degrees C ceramics were annealed at different temperatures in the range of 1200-1600 degrees C to gain SiC-TaC-C nanocomposites. The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicate that the TaC starts to crystallize at lower temperature than the beta-SiC. It is particularly worth pointing out that the unique core-shell structured TaC@C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 degrees C. Even at a high temperature of 1600 degrees C, the grain sizes of beta-SiC and TaC are smaller than 30 nm, fulfilling the definition of nanocomposites. The present study related to SiC-TaC-C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment. |
| Freie Schlagworte: | polymer-derived ceramics; TaC; SiC; nanocomposites; core-shell structure MECHANICAL-PROPERTIES; OXIDATION BEHAVIOR; COMPOSITES; HF; MICROSTRUCTURE; DENSIFICATION; PERFORMANCE; FABRICATION; SILICON; ZR |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 23 Jun 2020 06:19 |
| Letzte Änderung: | 23 Jun 2020 06:19 |
| PPN: | |
| Projekte: | National Natural Science Foundation of China, Grant Number 51872246 |
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