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Abstract Summary
Conference:
105th Annual Meeting & Exposition
Instructions
and
Links
Symposium:
20. Ceramic Matrix Composites
Session:
Geopolymer Composites -
1:00:00 PM - 5:00:00 PM 4/28/2003
Abs. Title:
Geopolymer Matrix Composites: Update and Overview
Abstract #:
7415
Type:
Invited
Submitted:
11/28/2002 3:22:05 AM
Status:
Accepted
Scheduled?
Yes
Abstract:
Geopolymer Matrix Composites were introduced to the American ceramic community 15 years ago at the 12th Annual Conference on Composites and Advanced Ceramic Materials, Cocoa-Beach. The paper titled « Geopolymer: Room-Temperature Ceramic Matrix for Composites » was presented in the session dedicated to Glass and Glass-ceramic Marix Composites; see the paper in Ceram. Eng. Sci. Proc., 9 [7-8] pp. 835-842 (1988). Geopolymers were first considered as exotic materials, yet they succesfully evolved into a fully recognized new class of materials with excellent ceramic properties and unique processing and manufacturing features. Geopolymers harden at room temperature (between 20 and 120°C) or in the autoclave at 180°C, their processing being very similar to thermosetting organic resins; but they are stable up to 1200°C. A wide range of alkaline resistant inorganic reinforcemnts have been combined with geopolymer matrices yielding fire-resistant or heat resistant composites, with interesting mechanical properties. For the chemical designation of geopolymers based on silico-aluminates, the term poly(sialate) was adopted. Sialate is an abbreviation for silicon-oxo-aluminate. Polysialates have this empirical formula: Mn{-(SiO
2
)z-AlO
2
}n, wH
2
O, wherein M is a cation such as potassium, sodium or calcium, and «n» is a degree of polycondensation; «z» is 1, 2, 3 or higher, up to 32. Three Dimensional Network (3D) polymers are of the type: Poly(sialate) Mn-(-Si-O-Al-O-)n M-PS Si:Al=1:1 Poly(sialate-siloxo) Mn-(Si-O-Al-O-Si-O-)n M-PSS Si:Al=2:1 Poly(sialate-disiloxo) Mn-(Si-O-Al-O-Si-O-Si-O-)n M-PSDS Si:Al=3:1 For Si:Al>>3:1, the polymeric structure results from the cross linking of polysilicate chains or sheets with a sialate link (-Si-O-Al-O-) (2D or 3D cross-link). The author will present the results of 15 years of experience with Carbon fiber reinforced geopolymer composite, based on a study carried out with F.A.A. on cabin fire-safety, and also Silicon Carbid reinforcement for high temperature foundry use. The capability for hand layup or filament winding and low temperature curing makes Geopolymer composite ideally suited for high-temperature ceramic like composite precursors.
Abstract Author(s)
1
Presenting
Joseph Davidovits -
1011722
Organization
Geopolymer Institute
Phone #
Fax #
+33 323 676988
Professional Title
Street Address
16 rue Galilee
City
Saint-Quentin
State
Province
Picardie
Country
France
Postal Code
02100
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