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Synthesis and high-temperature evolution of polysilylcarbodiimide-derived SiCN ceramic coatings

Klausmann, Amon and Morita, Koji and Johanns, Kurt E. and Fasel, Claudia and Durst, Karsten and Mera, Gabriela and Riedel, Ralf and Ionescu, Emanuel (2015):
Synthesis and high-temperature evolution of polysilylcarbodiimide-derived SiCN ceramic coatings.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3771-3780, 35, (14), ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.07.013],
[Article]

Abstract

Herein we report on the preparation and high-temperature evolution of polysilylcarbodiimides-derived SiCN ceramic coatings. Two polysilylcarbodiimide-based preceramic polymers with different molecular structures (i.e., a rather linear and a highly-branched polymer) were synthesized and their use for the preparation of sub-μm-thick SiCN ceramic coatings was assessed. The different molecular architecture of the polysilylcarbodiimide has been shown to significantly affect the composition (e.g., the content of segregated carbon) and properties of the resulting ceramic coatings. Thus, the high-temperature crystallization behavior and the ordering of the segregated carbon phase depend on the carbon content and consequently on the preceramic polymer structure. Moreover, the content of the segregated carbon phase present within the microstructure of the prepared SiCN coatings determines their hardness and elastic properties. The low-carbon-content coating has been shown to be stiffer and have higher hardness than the carbon-rich SiCN sample.

Item Type: Article
Erschienen: 2015
Creators: Klausmann, Amon and Morita, Koji and Johanns, Kurt E. and Fasel, Claudia and Durst, Karsten and Mera, Gabriela and Riedel, Ralf and Ionescu, Emanuel
Title: Synthesis and high-temperature evolution of polysilylcarbodiimide-derived SiCN ceramic coatings
Language: English
Abstract:

Herein we report on the preparation and high-temperature evolution of polysilylcarbodiimides-derived SiCN ceramic coatings. Two polysilylcarbodiimide-based preceramic polymers with different molecular structures (i.e., a rather linear and a highly-branched polymer) were synthesized and their use for the preparation of sub-μm-thick SiCN ceramic coatings was assessed. The different molecular architecture of the polysilylcarbodiimide has been shown to significantly affect the composition (e.g., the content of segregated carbon) and properties of the resulting ceramic coatings. Thus, the high-temperature crystallization behavior and the ordering of the segregated carbon phase depend on the carbon content and consequently on the preceramic polymer structure. Moreover, the content of the segregated carbon phase present within the microstructure of the prepared SiCN coatings determines their hardness and elastic properties. The low-carbon-content coating has been shown to be stiffer and have higher hardness than the carbon-rich SiCN sample.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Number: 14
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Ceramic coatings, Silicon carbonitride, Polysilylcarbodiimide, Mechanical properties, Thermal properties
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 09 Oct 2015 08:50
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.07.013
Identification Number: doi:10.1016/j.jeurceramsoc.2015.07.013
Funders: The financial support from the German Research Foundation (DFG) Project No. IO 64/2-1 and the Materials World Network (Nanostructure and Thermodynamics of Polymer-Derived Ceramics) is gratefully acknowledged.
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