Li, Wei ; Du, Hanzi ; Tian, Chuanmu ; Jiang, Tianshu ; Bernauer, Jan ; Widenmeyer, Marc ; Wiehl, Leonore ; Molina-Luna, Leopoldo ; Hofmann, Jan Philipp ; Weidenkaff, Anke ; Yu, Zhaoju ; Riedel, Ralf (2022)
Single‐source‐precursor derived bulk Si 3 N 4 /HfB x N 1‐x ceramic nanocomposites with excellent oxidation resistance.
In: Zeitschrift für anorganische und allgemeine Chemie, 648 (21)
doi: 10.1002/zaac.202200203
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In the present work, bulk Si3N4/HfBxN1-x ceramic nanocomposites were successfully fabricated via a polymer-derived ceramic approach. The chemical reaction to form the single-source precursor was confirmed by FT-IR and XPS, in which both Si-H and N-H groups of perhydropolysilazane react with borane dimethyl sulfide complex and tetrakis(dimethylamido) hafnium(IV). The investigation of the polymer-to-ceramic transformation of the synthesized precursors indicates that Hf- and B-modified PHPS exhibits high ceramic yields of up to 100 wt % after pyrolysis at 1000 degrees C under ammonia. Moreover, XRD and TEM results show that the SiHfBN ceramics with a molar ratio of B : Hf=5 and 10 resist crystallization at temperatures up to 1500 degrees C and separate after annealing at 1700 degrees C into nanocomposites comprising of an alpha-Si3N4 matrix with embedded ternary HfBxN1-x phases, solid solutions of rock salt-type HfN and HfB. Based on the investigation, warm-pressing was applied to fabricate bulk SiHfBN specimens, and the oxidation behavior of samples annealed at 1700 degrees C was recorded at 1500 degrees C over a range of oxidation times between 1 and 50 h. The weight changes of Si3N4/HfBxN1-x ceramics with B : Hf molar ratios of 2 : 1, 5 : 1 and 10 : 1 are 4.31 %, 4.37 % and 2.57 %, respectively. The formation of HfSiO4, B2O3 and SiO2 during oxidation plays a crucial role for the improvement of the oxidation resistance of the Si3N4/HfBxN1-x ceramics.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Li, Wei ; Du, Hanzi ; Tian, Chuanmu ; Jiang, Tianshu ; Bernauer, Jan ; Widenmeyer, Marc ; Wiehl, Leonore ; Molina-Luna, Leopoldo ; Hofmann, Jan Philipp ; Weidenkaff, Anke ; Yu, Zhaoju ; Riedel, Ralf |
| Art des Eintrags: | Bibliographie |
| Titel: | Single‐source‐precursor derived bulk Si 3 N 4 /HfB x N 1‐x ceramic nanocomposites with excellent oxidation resistance |
| Sprache: | Englisch |
| Publikationsjahr: | 15 November 2022 |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Zeitschrift für anorganische und allgemeine Chemie |
| Jahrgang/Volume einer Zeitschrift: | 648 |
| (Heft-)Nummer: | 21 |
| DOI: | 10.1002/zaac.202200203 |
| Kurzbeschreibung (Abstract): | In the present work, bulk Si3N4/HfBxN1-x ceramic nanocomposites were successfully fabricated via a polymer-derived ceramic approach. The chemical reaction to form the single-source precursor was confirmed by FT-IR and XPS, in which both Si-H and N-H groups of perhydropolysilazane react with borane dimethyl sulfide complex and tetrakis(dimethylamido) hafnium(IV). The investigation of the polymer-to-ceramic transformation of the synthesized precursors indicates that Hf- and B-modified PHPS exhibits high ceramic yields of up to 100 wt % after pyrolysis at 1000 degrees C under ammonia. Moreover, XRD and TEM results show that the SiHfBN ceramics with a molar ratio of B : Hf=5 and 10 resist crystallization at temperatures up to 1500 degrees C and separate after annealing at 1700 degrees C into nanocomposites comprising of an alpha-Si3N4 matrix with embedded ternary HfBxN1-x phases, solid solutions of rock salt-type HfN and HfB. Based on the investigation, warm-pressing was applied to fabricate bulk SiHfBN specimens, and the oxidation behavior of samples annealed at 1700 degrees C was recorded at 1500 degrees C over a range of oxidation times between 1 and 50 h. The weight changes of Si3N4/HfBxN1-x ceramics with B : Hf molar ratios of 2 : 1, 5 : 1 and 10 : 1 are 4.31 %, 4.37 % and 2.57 %, respectively. The formation of HfSiO4, B2O3 and SiO2 during oxidation plays a crucial role for the improvement of the oxidation resistance of the Si3N4/HfBxN1-x ceramics. |
| Freie Schlagworte: | Single-source-precursor, Si3N4, HfBxN1-x, Ceramic nanocomposites, Oxidation resistance, High-temperature evolution, Diboride-Silicon-Carbide, Mechanical properties, Behavior, Nitride, Dense, Viscosity, Kinetics, Films |
| Zusätzliche Informationen: | Special Issue: Dedicated to Professor Wolfgang Schnick on the occasion of his 65th birthday ; Art.Nr.: e202200203 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Elektronenmikroskopie 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement |
| Hinterlegungsdatum: | 09 Nov 2022 08:20 |
| Letzte Änderung: | 11 Jul 2023 08:37 |
| PPN: | 501380337 |
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