Ceramics-Silikáty 43 (4) 193-198 (1999)

MoSi₂ - Al₂O₃ DOUBLE-MATRIX COMPOSITES PREPARED BY IN SITU REACTIONS

Z. Pánek

Composites consisting of MoSi₂ and Al₂O₃ interlocked matrices with porosity below 1% were prepared by the reactive hot-pressing of Mo, Si and Al₂O₃ powder mixtures at 1500 °C for 2h. The electrical resistivity of the as-prepared materials decreases from 3.1x10^-5 W m to 1.4x10^-6 W m as MoSi₂ content increases from 30 vol % to 50 vol %. Insufficient chemical stability and creep resistance of double-matrix MoSi₂-Al₂O₃ materials were observed in air above 1100 °C, probably due to oxygen transport into the interior of material along the MoSi₂ - Al₂O₃ interface.

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