Densification Study of SiC:Al₂O₃:Y₂O₃ with Polymer Additions

Abstract:

The influence of polymer precursor additions on liquid phase sintering of SiC:Al2O3:Y2O3 has been evaluated. Two polymer precursors were used: polymethylhydrogensiloxane and D4Vi (1,3,5,7-tetramethyl-1,3,5,7-tetraviniylcyclotetrasiloxane). The ceramic phase had the following composition in wt%: 91.6 SiC, 4.2 Al2O3 and 4.2 Y2O3. The composites were prepared using the following ceramic phase to polymer ratios in wt%: 82.7: 17.3; 74.0: 26.0 and 71.5: 28.5. Density measurements were carried out using a helium picnometry and the Archimedes method. The crystalline phases were identified by X-ray diffraction analysis and the microstructures were observed by optical and scanning electron microscopy.

• Periodical: Materials Science Forum (Volumes 498-499)
• Pages: 494-499
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.498-499.494
• Online since: November 2005
• Authors: Ana Lúcia Exner Godoy, José Carlos Bressiani, Ana Helena A. Bressiani
• Keywords: Densification, Polymeric Precursor, Silicon Carbide (SiC)

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