Influence of Addition of Polymeric Precursors of Ceramics on Sintering of Al₂O₃

Abstract:

The effects of adding polymer precursor on the sintering behavior, microstructure and hardness of alumina ceramics have been studied. Polymer sintering aid polymethylhidrogensiloxane were used for alumina based ceramics sintered at 1650º C. The sintered materials were characterized using: (a) helium picnometry to determine apparent density; (b) x-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy and energy dispersive x-ray spectrometry to determine the microstructure and composition; (c) Vickers indentation analysis to determine the hardness and fracture toughness. The addition of polymethylhidrogensiloxane yielded alumina/mullite composites. The preparation of ceramic composites using small amounts of polymer precursors is suited for alumina based ceramics. The processing route being simple, it has the potential to enable the manufacture of complex shaped pieces.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1092-1097
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1092
• Online since: August 2012
• Authors: Ana Lúcia Exner Godoy, José Carlos Bressiani, Ana Helena de Almeida Bressiani
• Keywords: Alumina, Microstructure, Polymer Precursor, Polysiloxane

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