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Highly porous macro- and micro-cellular ceramics from a polysilazane precursor

Vakifahmetoglu, C. and Menapace, I. and Hirsch, A. and Biasetto, L. and Hauser, R. and Riedel, R. and Colombo, P. (2009):
Highly porous macro- and micro-cellular ceramics from a polysilazane precursor.
In: Ceramics International, 35 (8), Elsevier, pp. 3281-3290, ISSN 02728842,
[Online-Edition: http://dx.doi.org/10.1016/j.ceramint.2009.05.022],
[Article]

Abstract

Micro- and macro-cellular SiCN and SiOCN foams were produced via two different routes by using a polysilazane preceramic polymer. In the first route, a mixture of partially cross-linked polysilazane and poly(methylmetacrylate) microspheres, used as sacrificial fillers, was warm pressed and subsequently pyrolyzed to create micro-cellular foams. In the second route, liquid polysilazane was mixed with a physical blowing agent and the blend was cured and pyrolyzed, leading to the formation of macro-cellular ceramics in a one-step process. Ceramic components of different morphology and characteristics, depending on the processing method adopted, were fabricated. The foams had a mostly interconnected porosity ranging from ∼60 to 80 vol% and possessing a compressive strength in the range ∼1–11 MPa. Some oxygen contamination was found in the foams obtained using the sacrificial fillers, probably because of the adsorbed humidity on their surface. The polymer derived ceramic (PDC) route is an efficient and cost effective way to produce SiCN-based foams possessing tailored pore architecture and properties suitable for high temperature applications.

Item Type: Article
Erschienen: 2009
Creators: Vakifahmetoglu, C. and Menapace, I. and Hirsch, A. and Biasetto, L. and Hauser, R. and Riedel, R. and Colombo, P.
Title: Highly porous macro- and micro-cellular ceramics from a polysilazane precursor
Language: English
Abstract:

Micro- and macro-cellular SiCN and SiOCN foams were produced via two different routes by using a polysilazane preceramic polymer. In the first route, a mixture of partially cross-linked polysilazane and poly(methylmetacrylate) microspheres, used as sacrificial fillers, was warm pressed and subsequently pyrolyzed to create micro-cellular foams. In the second route, liquid polysilazane was mixed with a physical blowing agent and the blend was cured and pyrolyzed, leading to the formation of macro-cellular ceramics in a one-step process. Ceramic components of different morphology and characteristics, depending on the processing method adopted, were fabricated. The foams had a mostly interconnected porosity ranging from ∼60 to 80 vol% and possessing a compressive strength in the range ∼1–11 MPa. Some oxygen contamination was found in the foams obtained using the sacrificial fillers, probably because of the adsorbed humidity on their surface. The polymer derived ceramic (PDC) route is an efficient and cost effective way to produce SiCN-based foams possessing tailored pore architecture and properties suitable for high temperature applications.

Journal or Publication Title: Ceramics International
Volume: 35
Number: 8
Publisher: Elsevier
Uncontrolled Keywords: Silicon carbonitride, Foams, Polysilazane preceramic polymer, Compression strength
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Apr 2012 09:20
Official URL: http://dx.doi.org/10.1016/j.ceramint.2009.05.022
Identification Number: doi:10.1016/j.ceramint.2009.05.022
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