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Synthesis of Ultrahigh-Temperature Stable Hafnium-Containing Ceramic Nanocomposites

Ionescu, Emanuel and Yuan, Jia and Mainzer, Bernd and Kleebe, Hans-Joachim and Riedel, Ralf (2012):
Synthesis of Ultrahigh-Temperature Stable Hafnium-Containing Ceramic Nanocomposites.
In: Zeitschrift für anorganische und allgemeine Chemie, 638 (10), Wiley, p. 1557, ISSN 00442313,
[Online-Edition: http://dx.doi.org/10.1002/zaac.201203010],
[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 and Yuan, Jia and Mainzer, Bernd and Kleebe, Hans-Joachim and 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: 638
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
Official URL: http://dx.doi.org/10.1002/zaac.201203010
Identification Number: doi:10.1002/zaac.201203010
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