Feng, Bo ; Peter, Johannes ; Fasel, Claudia ; Wen, Qingbo ; Zhang, Yue ; Kleebe, Hans-Joachim ; Ionescu, Emanuel (2020)
High‐temperature phase and microstructure evolution of polymer‐derived SiZrCN and SiZrBCN ceramic nanocomposites.
In: Journal of the American Ceramic Society, 103 (12)
doi: 10.1111/jace.17149
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
A zirconium and a zirconium/boron containing single‐source precursor were synthesized via chemical modification of a commercially available polysilazane (Durazane 1800) with tetrakis (dimethylamido) zirconium (IV) (TDMAZ) as well as with both TDMAZ and borane dimethyl sulfide complex, respectively. The polymer‐to‐ceramic transformation of the precursors into SiZrCN and SiZrBCN ceramics as well as the thermal evolution of their phase composition and microstructure was studied. The pyrolysis of the precursors led to the formation of amorphous SiZrCN and SiZrBCN ceramics. Interestingly, the as prepared SiZrBCN ceramic was single‐phasic and fully featureless; whereas SiZrCN exhibited the presence of nano‐sized ZrO2 particles; however, only very localized in close proximity to internal surfaces. Heat treatment at higher temperatures induced crystallization processes in both prepared ceramics. Thus, at temperatures beyond 1500°C, cubic ZrCxNy, β‐Si3N4 as well as β‐SiC were generated. It was shown that the incorporation of B into SiZrCN suppressed the crystallization of ZrCxNy and, in addition, impeded the reaction of SiNx with C, resulting in an improved thermal stability of SiZrBCN compared to SiZrCN ceramic. Moreover boron was shown to be mainly located in the sp2‐hybridized “free” carbon present in SiZrBCN, forming a turbostratic BCN phase which has been unequivocally detected by means of high‐resolution transmission electron microscopy (HRTEM) and energy‐dispersive X‐ray spectroscopy (EDS).
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Feng, Bo ; Peter, Johannes ; Fasel, Claudia ; Wen, Qingbo ; Zhang, Yue ; Kleebe, Hans-Joachim ; Ionescu, Emanuel |
| Art des Eintrags: | Bibliographie |
| Titel: | High‐temperature phase and microstructure evolution of polymer‐derived SiZrCN and SiZrBCN ceramic nanocomposites |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2020 |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 103 |
| (Heft-)Nummer: | 12 |
| DOI: | 10.1111/jace.17149 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | A zirconium and a zirconium/boron containing single‐source precursor were synthesized via chemical modification of a commercially available polysilazane (Durazane 1800) with tetrakis (dimethylamido) zirconium (IV) (TDMAZ) as well as with both TDMAZ and borane dimethyl sulfide complex, respectively. The polymer‐to‐ceramic transformation of the precursors into SiZrCN and SiZrBCN ceramics as well as the thermal evolution of their phase composition and microstructure was studied. The pyrolysis of the precursors led to the formation of amorphous SiZrCN and SiZrBCN ceramics. Interestingly, the as prepared SiZrBCN ceramic was single‐phasic and fully featureless; whereas SiZrCN exhibited the presence of nano‐sized ZrO2 particles; however, only very localized in close proximity to internal surfaces. Heat treatment at higher temperatures induced crystallization processes in both prepared ceramics. Thus, at temperatures beyond 1500°C, cubic ZrCxNy, β‐Si3N4 as well as β‐SiC were generated. It was shown that the incorporation of B into SiZrCN suppressed the crystallization of ZrCxNy and, in addition, impeded the reaction of SiNx with C, resulting in an improved thermal stability of SiZrBCN compared to SiZrCN ceramic. Moreover boron was shown to be mainly located in the sp2‐hybridized “free” carbon present in SiZrBCN, forming a turbostratic BCN phase which has been unequivocally detected by means of high‐resolution transmission electron microscopy (HRTEM) and energy‐dispersive X‐ray spectroscopy (EDS). |
| Freie Schlagworte: | China Scholarship Council, Grant Number: 201806020006, Deutsche Forschungsgemeinschaft, Grant Number: IO 64/14‐1, polymer‐derived ceramic nanocomposites, single‐source precursor, SiZrBCN ceramic, TEM characterization, ZrB2 ceramic |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 20 Okt 2020 05:26 |
| Letzte Änderung: | 03 Jul 2024 02:47 |
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Verfügbare Versionen dieses Eintrags
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High‐temperature phase and microstructure evolution of polymer‐derived SiZrCN and SiZrBCN ceramic nanocomposites. (deposited 25 Mär 2022 13:20)
- High‐temperature phase and microstructure evolution of polymer‐derived SiZrCN and SiZrBCN ceramic nanocomposites. (deposited 20 Okt 2020 05:26) [Gegenwärtig angezeigt]
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