The pulse electric current sintering technique (PECS) was demonstrated to be effective in rapid densification of fine‐grained Al 2 O 3 /3Y‐ZrO 2 using available commercial powders. The composites attained full densification (>99% of TD) at 1450°C in less than 5 min. The composites sintered at a high heating rate had a fine microstructure. The incorporation of 3 vol% 3Y‐ZrO 2 substantially increased the average fracture strength and the toughness of alumina to as high as 827 MPa and 6.1 MPa·m 1/2 , respectively. A variation in the heating rate during the PECS process influenced grain size, microstructure, and strength, though there was little or no variation in the fracture toughness.
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Jayaseelan et al. (2002) studied this question.
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