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Jayaseelan, D. Doni
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article
Pulse Electric Current Sintering of Al2O3/3 vol% ZrO2 with Constrained Grains and High Strength
Abstract
<jats:p>The pulse electric current sintering technique (PECS) was demonstrated to be effective in rapid densification of fine‐grained Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>/3Y‐ZrO<jats:sub>2</jats:sub> 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<jats:sub>2</jats:sub> substantially increased the average fracture strength and the toughness of alumina to as high as 827 MPa and 6.1 MPa·m<jats:sup>1/2</jats:sup>, 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.</jats:p>