Alumina ceramics were fabricated by spark-plasma-sintering (SPS) and hot-pressing at 1100 to 1600°C under 30 MPa for 5 min. The room temperature mechanical properties were measured. The SPS brought about dense alumina ceramics at a sintering temperature lower than that in the hot-pressing. The alumina ceramics obtained by SPS had strength, hardness and fracture toughness higher than those by hot-pressing. The alumina grains in the sintered bodies prepared by SPS grew larger than those by hot-pressing.
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Tamari et al. (1999) studied this question.
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