REINFORCEMENT OF PRECURSOR-DERIVED Si-C-N CERAMICS WITH CARBON NANOTUBES NANOTUBES

Liquid polyureasilazane was added to tetrahydrofuran (THF) suspensions of two types of carbon nanotubes (CNT), and the THF removed under vacuum. The viscous suspensions were cast into moulds and crosslinked by heat treatment at 360 C for 6 h in an Ar atmosphere. Thermolysis at 1000 C in an Ar atmosp...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2006-01, Vol.26 (15), p.3399-3405
Main Authors: Katsuda, Y, Gerstel, P, Narayanan, J, Bill, J, Aldinger, F
Format: Article
Language:English
Online Access:Get full text
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Summary:Liquid polyureasilazane was added to tetrahydrofuran (THF) suspensions of two types of carbon nanotubes (CNT), and the THF removed under vacuum. The viscous suspensions were cast into moulds and crosslinked by heat treatment at 360 C for 6 h in an Ar atmosphere. Thermolysis at 1000 C in an Ar atmosphere yielded Si-C-N nanocomposites containing 0-2 wt% CNT. Fracture toughness was assessed by applying thermal stress to edge-cracked discs. The presence of one type of CNT significantly enhanced the fracture toughness, with fibre pull-out and bridging being observed on the fracture surfaces. This toughening effect was not observed with the other type of CNT, attributed to the amorphous nature of the tubes which resulted in degradation during thermolysis. 28 refs.
ISSN:0955-2219