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Monolithic ZrB2‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid

Feng, Bo ; Fetzer, Ann‐Katrin ; Ulrich, Anke Silvia ; Galetz, Mathias Christian ; Kleebe, Hans-Joachim ; Ionescu, Emanuel (2022)
Monolithic ZrB2‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid.
In: Journal of the American Ceramic Society, 105 (1)
doi: 10.1111/jace.18038
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

In the present work, dense ZrB2-based monoliths were produced via hot-pressing of ZrB2 powders coated with amorphous polymer-derived SiCN, SiZrCN, or SiZrBCN at relatively moderate temperatures (i.e., 1800celcius). Thus, ZrB2 particles were embedded in polymer-derived ceramic shell were realized by coating their surface with the corresponding polymeric precursors (polysilazane, Zr-modified polysilazane, Zr- and B-modified polysilazane, as for SiCN, SiZrCN, and SiZrBCN; respectively), followed by cross-linking at 200celcius and pyrolysis at 1100celcius in Ar atmosphere. The obtained monolithic samples were carefully characterized concerning their phase composition and microstructure. Typically, the densified samples exhibit a homogeneous microstructure consisting of ZrB2 grains and a multi-phasic polymer-derived ceramic grain boundary phase (beta-SiC, t-BCN, ZrO2, and ZrC). The prepared monoliths exhibited fair hardness values, that is, 12.5, 14.2, and 13.3 GPa for ZrB2/SiCN, ZrB2/SiZrCN, and ZrB2/SiZrBCN.

Typ des Eintrags: Artikel
Erschienen: 2022
Autor(en): Feng, Bo ; Fetzer, Ann‐Katrin ; Ulrich, Anke Silvia ; Galetz, Mathias Christian ; Kleebe, Hans-Joachim ; Ionescu, Emanuel
Art des Eintrags: Bibliographie
Titel: Monolithic ZrB2‐based UHTCs using polymer‐derived Si(Zr,B)CN as sintering aid
Sprache: Englisch
Publikationsjahr: Januar 2022
Verlag: The American Ceramic Society
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society
Jahrgang/Volume einer Zeitschrift: 105
(Heft-)Nummer: 1
DOI: 10.1111/jace.18038
Kurzbeschreibung (Abstract):

In the present work, dense ZrB2-based monoliths were produced via hot-pressing of ZrB2 powders coated with amorphous polymer-derived SiCN, SiZrCN, or SiZrBCN at relatively moderate temperatures (i.e., 1800celcius). Thus, ZrB2 particles were embedded in polymer-derived ceramic shell were realized by coating their surface with the corresponding polymeric precursors (polysilazane, Zr-modified polysilazane, Zr- and B-modified polysilazane, as for SiCN, SiZrCN, and SiZrBCN; respectively), followed by cross-linking at 200celcius and pyrolysis at 1100celcius in Ar atmosphere. The obtained monolithic samples were carefully characterized concerning their phase composition and microstructure. Typically, the densified samples exhibit a homogeneous microstructure consisting of ZrB2 grains and a multi-phasic polymer-derived ceramic grain boundary phase (beta-SiC, t-BCN, ZrO2, and ZrC). The prepared monoliths exhibited fair hardness values, that is, 12.5, 14.2, and 13.3 GPa for ZrB2/SiCN, ZrB2/SiZrCN, and ZrB2/SiZrBCN.

Freie Schlagworte: microstructure characterization; polymer-derived ceramic nanocomposites; transmission electron microscopy; ultrahigh-temperature ceramics; ZrB2; HIGH-TEMPERATURE CERAMICS; MECHANICAL-PROPERTIES; OXIDATION BEHAVIOR; TRIBOLOGICAL PROPERTIES; ZRB2-SIC CERAMICS; RESIDUAL-STRESSES; THERMAL-EXPANSION; PHASE EVOLUTION; SICN; NANOCOMPOSITES
Zusätzliche Informationen:

German Research Foundation (DFG) European Commission, Grant Number RTG 2561. German Research Foundation (DFG), Grant Number IO 64/14-1. China Scholarship Council, Grant Number 201806020006.

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
TU-Projekte: DFG|IO64/14-1|Heisenberg-Förderung
Hinterlegungsdatum: 10 Nov 2021 14:36
Letzte Änderung: 11 Nov 2021 13:20
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