Ionescu, Emanuel ; Yuan, Jia ; Mainzer, Bernd ; Kleebe, Hans-Joachim ; Riedel, Ralf (2012):
Synthesis of Ultrahigh-Temperature Stable Hafnium-Containing Ceramic Nanocomposites.
In: Zeitschrift für anorganische und allgemeine Chemie, 638 (10), p. 1557. Wiley, ISSN 00442313,
[Article]
Abstract
Polymer-derived ceramic nanocomposites (PDC-NCs) can be synthesized via thermal conversion of suitable single-source precursors, leading in a first step to amorphous single-phase ceramics, which subsequently undergo phase separation pro- cesses to furnish bi- or multiphase ceramic nanocomposites. PDC-NCs have been shown to be excellent candidate materials suitable for applications at ultrahigh-temperatures and under harsh environments. [1,2] In the present work, amorphous SiHf(B)CN-based PDC-NCs were synthesized via cross-link- ing and ceramization of a polysilazane which was chemically modified by Hf(NEt2)4 and borane dimethylsulfide complex (BH3.SMe2). High-temperature annealing of the obtained amorphous SiHf(B)CN ceramics in nitrogen atmosphere led to HfN/Si(B)CN nanocom-posites; whereas HfB2/Si(B)CN was obtained upon annealing in argon atmosphere. The presented results emphasize a convenient preparative approach to nanos- tructured ultrahigh-temperature stable materials starting from a greatly flexible/compliant single-source precursor.
| Item Type: | Article |
|---|---|
| Erschienen: | 2012 |
| Creators: | Ionescu, Emanuel ; Yuan, Jia ; Mainzer, Bernd ; Kleebe, Hans-Joachim ; Riedel, Ralf |
| Title: | Synthesis of Ultrahigh-Temperature Stable Hafnium-Containing Ceramic Nanocomposites |
| Language: | English |
| Abstract: | Polymer-derived ceramic nanocomposites (PDC-NCs) can be synthesized via thermal conversion of suitable single-source precursors, leading in a first step to amorphous single-phase ceramics, which subsequently undergo phase separation pro- cesses to furnish bi- or multiphase ceramic nanocomposites. PDC-NCs have been shown to be excellent candidate materials suitable for applications at ultrahigh-temperatures and under harsh environments. [1,2] In the present work, amorphous SiHf(B)CN-based PDC-NCs were synthesized via cross-link- ing and ceramization of a polysilazane which was chemically modified by Hf(NEt2)4 and borane dimethylsulfide complex (BH3.SMe2). High-temperature annealing of the obtained amorphous SiHf(B)CN ceramics in nitrogen atmosphere led to HfN/Si(B)CN nanocom-posites; whereas HfB2/Si(B)CN was obtained upon annealing in argon atmosphere. The presented results emphasize a convenient preparative approach to nanos- tructured ultrahigh-temperature stable materials starting from a greatly flexible/compliant single-source precursor. |
| Journal or Publication Title: | Zeitschrift für anorganische und allgemeine Chemie |
| Volume of the journal: | 638 |
| Issue Number: | 10 |
| Publisher: | Wiley |
| Uncontrolled Keywords: | ceramic nanocomposites, ultrahigh-temperature ceramics, hafnium nitride |
| Divisions: | 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids 11 Department of Materials and Earth Sciences > Earth Science 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 21 Mar 2013 08:35 |
| URL / URN: | http://dx.doi.org/10.1002/zaac.201203010 |
| Identification Number: | doi:10.1002/zaac.201203010 |
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