Ceramics, Volume 3, Issue 4 (December 2020) – 8 articles
Cover Story (view full-size image): TiO2 ceramics were produced by the high-pressure SPS of an anatase nanopowder. When the pressure increased from 76 to 400 MPa, the anatase to rutile transition temperature decreased from 700 to 550 °C and the densification process occurred at lower temperatures. Under 400 MPa, the rate of the phase transition increased significantly, inducing an abrupt volume reduction of 8%, which generated strong stress leading to twinning and fracture of the rutile grains. In the final ceramic, the majority of the grains consisted of twinned crystals resulting in a reduction of the crystallite size, compare to ceramics sintered at lower pressure. View this paper
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