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Processing of Ceramic Foams from Polymeric Precursor-Alumina Suspensions
- Source :
- Cellular Polymers. 20:17-36
- Publication Year :
- 2001
- Publisher :
- SAGE Publications, 2001.
-
Abstract
- A polysilane was used as the precursor for silicon carbide (SiC) and different amounts of it was dissolved in dichloromethane. Subsequently, between 10 to 80 %wt of alumina (Al2O3) powder was added into the solutions to make SiC-Al2O3 suspensions. Cubes of polyurethane (PU) foams with open cells in the size range 500-1200μm were soaked in these suspensions and pyrolysed in flowing nitrogen to produce SiC-Al2O3 composite foams. Some foams were heated further in nitrogen to 1300°C. The foams produced consist of an open cell structure and hole-free solid struts which were also cracks free in the polysilane-Al2O3 80:2Owt% formulation. The retention of shape during processing was excellent. Shrinkage observed after pyrolysis and further heating the foams was measured and can be controlled by varying the Al2O3 content. The foams produced have porosities in the range 87 to 95%. The maximum compressive strength of the pyrolysed foams prepared using the polysilane-Al2O3 80:20 wt% formulation was 2.3MPa.
- Subjects :
- chemistry.chemical_classification
Materials science
Polymers and Plastics
Organic Chemistry
Sintering
Polymer
Microstructure
chemistry.chemical_compound
chemistry
Chemical engineering
visual_art
Silicon carbide
visual_art.visual_art_medium
Polysilane
Ceramic
Composite material
Pyrolysis
Dichloromethane
Subjects
Details
- ISSN :
- 14782421 and 02624893
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Cellular Polymers
- Accession number :
- edsair.doi...........e466301a1756d5c2d6d072433561dd34
- Full Text :
- https://doi.org/10.1177/026248930102000102