Processing of Silicon Carbide‐Mullite‐Alumina Nanocomposites

Yoshio Sakka, Donald D. Bidinger, Ilhan A. Aksay

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

Nanocomposite materials in the form of nanometer‐sized second‐phase particles dispersed in a ceramic matrix have been shown to display enhanced mechanical properties. In spite of this potential, processing methodologies to produce these nanocomposites are not well established. In this paper, we describe a new method for processing SiC‐mullite‐Al2O3 nanocomposites by the reaction sintering of green compacts prepared by colloidal consolidation of a mixture of SiC and Al2O3 powders. In this method, the surface of the SiC particles was first oxidized to produce silicon oxide and to reduce the core of the SiC particles to nanometer size. Next, the surface silicon oxide was reacted with alumina to produce mullite. This process results in particles with two kinds of morphologies: nanometer‐sized SiC particles that are distributed in the mullite phase and mullite whiskers in the SiC phase. Both particle types are immersed in an Al2O3 matrix.

Original languageEnglish (US)
Pages (from-to)479-486
Number of pages8
JournalJournal of the American Ceramic Society
Volume78
Issue number2
DOIs
StatePublished - Feb 1995

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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