Fine Particle Reinforced Composites Obtained by Suspension Method

Abstract:

In the production of composites by the suspension method (mechanical stirring) may beused, ceramic particles, which are wetted by the liquid metal such SiC, Al₂O₃ or glassy carbon.However, to obtain a stable suspension with the use a particle size below 10 μm is extremelydifficult. Phenomena related i.a. with agglomeration of particles, convection currents over moltenmetal surface make practically impossible to obtain composite material. One possibility to obtainfine reinforced composite is the use of in situ methods, in which the reinforcing phase is formed bythe reaction between the aluminum and the reactive powder oxides such FeO, TiO₂, SiO₂, NiO, Nb₂O₅ or Fe₂O₃. Such reactions are exothermic (aluminothermic) and their kinetics dependent onthe dispersion of the reactants, the quantitative phase composition and temperature.The technological solution involving the formation of a suspension with particles (chemically activewith aluminum) is one of the promising solutions to obtain batch material for the synthesis ofcomposites reinforced with Al₂O₃ and intermetallic phases. The aim of this study is to evaluate thesuitability of suspension technology to obtained in situ fine reinforced composite.

• Periodical: Solid State Phenomena (Volume 211)
• Pages: 53-56
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.211.53
• Online since: November 2013
• Authors: Maciej Dyzia*
• Keywords: Aluminothermic Reaction, In Situ Composite, Intermetallic Phase

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