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

Vakifahmetoglu, C. ; Menapace, I. ; Hirsch, A. ; Biasetto, L. ; Hauser, R. ; Riedel, R. ; Colombo, P. (2009)
Highly porous macro- and micro-cellular ceramics from a polysilazane precursor.
In: Ceramics International, 35 (8)
doi: 10.1016/j.ceramint.2009.05.022
Article, Bibliographie

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. ; Menapace, I. ; Hirsch, A. ; Biasetto, L. ; Hauser, R. ; Riedel, R. ; Colombo, P.
Type of entry: Bibliographie
Title: Highly porous macro- and micro-cellular ceramics from a polysilazane precursor
Language: English
Date: December 2009
Publisher: Elsevier
Journal or Publication Title: Ceramics International
Volume of the journal: 35
Issue Number: 8
DOI: 10.1016/j.ceramint.2009.05.022
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.

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
Last Modified: 05 Mar 2013 10:00
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