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Abstract
Abstract Bend strength, fracture toughness and thermal diffusivity of cordierite composites with 30 vol.% of either unstabilized or Y2O3-stabilized ZrO2 sintered at 1400°C have been determined as a function of sintering time. Depending on sintering time, the phase composition varies from cordierite + monoclinic ZrO2 to spinel + zircon. Cordierite with tetragonal ZrO2 sintered for 1 h exhibits a fracture toughness of ∼4·1 M Pa m , while composites consisting essentially of spinel and zircon with both inter- and intragranular monoclinic ZrO2 particles show the highest fracture toughness ( ∼4·7 M Pa m ). These composites are obtained when cordierite is sintered with unstabilized ZrO2 at 1400°C for >4h. They also exhibit the highest thermal diffusivity (48 × 10−3 cm2/s).
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