Journal
CERAMICS-SWITZERLAND
Volume 3, Issue 4, Pages 507-520Publisher
MDPI
DOI: 10.3390/ceramics3040041
Keywords
nanopowder TiO2; high-pressure spark plasma sintering; grain growth; densification rate
Funding
- LABEX iMUST of Universitede Lyon [ANR-10-LABX-0064, ANR-11-IDEX-0007]
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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 TiO2 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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