Abstract
Bulk glasses containing HfO2 nano-crystallites of 20–50nm were prepared by hot-pressing of HfO2–Al2O3–Y2O3 glass microspheres at 915°C for 10min. By annealing at temperatures below 1200°C, the bulk glasses were converted into transparent glass-ceramics with HfO2 nano-crystallites of 100–200nm, which showed the maximum transmittance of ∼70% in the infrared region. An increase of annealing temperature (>1300°C) resulted in opaque YAG/HfO2/Al2O3 eutectic ceramics. The eutectic ceramics contained fine Al2O3 crystallites and showed a high hardness of 19.8GPa. The fracture toughness of the eutectic ceramics increased with increasing annealing temperature, and reached the maximum of 4.0MPam1/2.
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