Effect of High Pressure Spark Plasma Sintering on the Densification of a Nb-Doped TiO2 Nanopowder - Archive ouverte HAL Access content directly
Journal Articles Ceramics Year : 2020

Effect of High Pressure Spark Plasma Sintering on the Densification of a Nb-Doped TiO2 Nanopowder

Abstract

Sintering under pressure by means of the spark plasma sintering (SPS) technique is a common route to reduce the sintering temperature and to achieve ceramics with a fine-grained microstructure. In this work, high-density bulk TiO 2 was sintered by high pressure SPS. It is shown that by applying high pressure during the SPS process (76 to 400 MPa), densification and phase transition start at lower temperature and are accelerated. Thus, it is possible to dissociate the two densification steps (anatase then rutile) and the transition phase during the sintering cycle. Regardless of the applied pressure, grain growth occurs during the final stage of the sintering process. However, twinning of the grains induced by the phase transition is enhanced under high pressure resulting in a reduction in the crystallite size.
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Dates and versions

hal-03093491 , version 1 (03-01-2021)

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Alexandre Verchère, Sandrine Cottrino, Gilbert Fantozzi, Shashank Mishra, Thomas Gaudisson, et al.. Effect of High Pressure Spark Plasma Sintering on the Densification of a Nb-Doped TiO2 Nanopowder. Ceramics, 2020, 3 (4), pp.507-520. ⟨10.3390/ceramics3040041⟩. ⟨hal-03093491⟩
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