Processing of silicon carbide-mullite-alumina nanocomposites

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08827.x· OSTI ID:79819

Sakka, Yoshio ^[1]; Bidinger, D D; Aksay, I A ^[2]

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1. National Research Inst. for Metals, Ibaraki (Japan)
2. Princeton Univ., NJ (United States)

Nanocomposite materials in the form of nanometer-sized phase particles dispersed in a ceramic matrix have own to display enhanced mechanical properties. In this potential, processing methodologies to produce these nanocomposites are not well established. In this paper, the authors describe a new method for processing SiC-mullite-Al{sub 2}O{sub 3} nanocomposites by the reaction sintering of green compacts prepared by colloidal consolidation of a mixture of SiC and Al{sub 2}O{sub 3} 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 manometer 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 Al{sub 2}O{sub 3} matrix.

• Sponsoring Organization: USDOE
• OSTI ID: 79819
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
MULLITE
OXIDATION
PARTICULATES
POWDERS
SILICON CARBIDES
SILICON OXIDES
SINTERING
SLIP CASTING
TRANSMISSION ELECTRON MICROSCOPY
WHISKERS