TU Darmstadt / ULB / TUbiblio

Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal

Thor, Nathalie ; Bernauer, Jan ; Petry, Nils-Christian ; Ionescu, Emanuel ; Riedel, Ralf ; Pundt, Astrid ; Kleebe, Hans-Joachim (2023)
Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal.
In: Journal of the European Ceramic Society, 43 (4)
doi: 10.1016/j.jeurceramsoc.2022.11.060
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Ultra-high temperature ceramic nanocomposites (UHTC-NC) within the Si(HfxTa1_x)(C)N system were synthe-sized via the polymer-derived ceramics (PDC) synthesis route. The microstructure evolution of the materials was investigated upon pyrolysis and subsequent heat treatment. The crystallization behavior and phase composition were studied utilizing X-ray diffraction, scanning-and transmission electron microscopy. Single-source -precursors were converted into amorphous single-phase ceramics, with the exception of surface crystallization effects, at 1000 degrees C in NH3. Annealing in N2 at 1600 degrees C resulted in fully crystalline UHTCs. The powder samples revealed microstructures consisting of two characteristic regions, bulk and surface; displaying intrinsic micro-structure and phase composition differences. Instead of the expected nitrides, transition metal carbides (TMC) were detected upon high-temperature anneal. The residual carbon available in the system triggered a decom-position reaction, resulting in the formation of TMCs plus gaseous nitrogen and SiC. Experimental data underline that N-containing PDCs are prone to phase separation accompanied by thermal decomposition and diffusion -controlled coarsening.

Typ des Eintrags: Artikel
Erschienen: 2023
Autor(en): Thor, Nathalie ; Bernauer, Jan ; Petry, Nils-Christian ; Ionescu, Emanuel ; Riedel, Ralf ; Pundt, Astrid ; Kleebe, Hans-Joachim
Art des Eintrags: Bibliographie
Titel: Microstructural evolution of Si(HfxTa1−x)(C)N polymer-derived ceramics upon high-temperature anneal
Sprache: Englisch
Publikationsjahr: April 2023
Verlag: Elsevier
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the European Ceramic Society
Jahrgang/Volume einer Zeitschrift: 43
(Heft-)Nummer: 4
DOI: 10.1016/j.jeurceramsoc.2022.11.060
Kurzbeschreibung (Abstract):

Ultra-high temperature ceramic nanocomposites (UHTC-NC) within the Si(HfxTa1_x)(C)N system were synthe-sized via the polymer-derived ceramics (PDC) synthesis route. The microstructure evolution of the materials was investigated upon pyrolysis and subsequent heat treatment. The crystallization behavior and phase composition were studied utilizing X-ray diffraction, scanning-and transmission electron microscopy. Single-source -precursors were converted into amorphous single-phase ceramics, with the exception of surface crystallization effects, at 1000 degrees C in NH3. Annealing in N2 at 1600 degrees C resulted in fully crystalline UHTCs. The powder samples revealed microstructures consisting of two characteristic regions, bulk and surface; displaying intrinsic micro-structure and phase composition differences. Instead of the expected nitrides, transition metal carbides (TMC) were detected upon high-temperature anneal. The residual carbon available in the system triggered a decom-position reaction, resulting in the formation of TMCs plus gaseous nitrogen and SiC. Experimental data underline that N-containing PDCs are prone to phase separation accompanied by thermal decomposition and diffusion -controlled coarsening.

Freie Schlagworte: polymer-derived ceramic, electron microscopy thermal decomposition, UHTC, transition metal carbide, source-precusor synthesis, oxidation behavior, nanocomposites, decomposition, Hafnium, TAC, polysilzane, composites, resistance, reduction
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: 26 Jan 2023 06:32
Letzte Änderung: 26 Jan 2023 06:32
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Frage zum Eintrag Frage zum Eintrag

Optionen (nur für Redakteure)
Redaktionelle Details anzeigen Redaktionelle Details anzeigen