Thermo-oxidative resistance of C-rich SiCN(O) nonwovens influenced by the pretreatment of the silazane

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008002
URN to cite this document: urn:nbn:de:bvb:703-epub-8002-5

Title data

Ramlow, Heloisa ; Ribeiro, Luiz F. B. ; Schafföner, Stefan ; Motz, Günter ; Machado, Ricardo A. F.:
Thermo-oxidative resistance of C-rich SiCN(O) nonwovens influenced by the pretreatment of the silazane.
In: Journal of the European Ceramic Society. Vol. 44 (2024) Issue 9 . - pp. 5308-5318.
ISSN 0955-2219
DOI der Verlagsversion: https://doi.org/10.1016/j.jeurceramsoc.2024.01.035

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Project information

Project financing:	Deutscher Akademischer Austauschdienst Deutsche Forschungsgemeinschaft

Abstract

C-rich SiCN(O) ceramic nonwovens with thermo-oxidation resistance up to 600 °C were developed from electrospinning of polyacrylonitrile in combination with different ratios of an oligomeric or polymeric silazane and subsequent pyrolysis. The influence of the selective pre-polymerization of the oligosilazane and the respective amount on the electrospinning, pyrolysis, phase formation and the properties of the resulting C-rich ceramic nonwovens was evaluated. The fiber diameter after pyrolysis at 1000 °C ranges from 0.26 to 0.63 µm. The oligosilazane/PAN-derived ceramic nonwovens contain high oxygen and carbon content because of high reactivity leading to a high ceramic yield due to additional crosslinking. A higher initial oxidation temperature compared to pure carbon was confirmed for all samples. However, the best result was achieved with a sample based on a high proportion of polysilazane in combination with PAN, as a dense passivating layer to protect the free carbon regions was obviously better able to form.

Further data

Item Type:	Article in a journal
Keywords:	Electrospinning; Polymer-derived ceramics; Preceramic polymers; Polyacrylonitrile; Oxidation resistance
DDC Subjects:	500 Science > 540 Chemistry 600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Ceramic Materials > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Stefan Schafföner Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Ceramic Materials
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-8002-5
Date Deposited:	15 Oct 2024 08:46
Last Modified:	15 Oct 2024 08:47
URI:	https://epub.uni-bayreuth.de/id/eprint/8002

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