Low-temperature ageing degradation of 2.5Y-TZP heat-treated at 1650°C

Subsurface evaluation of hydrothermal degradation of zirconia

“…This sample was later degraded in air at 300°C for 350 h. This treatment induces a massive t-m transformation throughout the bulk, causing microcracking in all the volume of the sample (see Ref. [30]). The XRD spectrum of the bulk degraded 10HAS sample shows a ratio I(À1 1 1) m /I(1 1 1) m of 0.14 and, by applying Eq.…”

Spark plasma sintering and characterization of 2Y-TZP ceramics

“…Yttria stabilized tetragonal zirconia polycrystals (Y-TZP) have raised considerable attention in these materials as a wide range of applications such as cutting tools, abrasive tools and dental materials because of their excellent mechanical properties [1][2][3]. It is well known that the sources for achieving such high mechanical properties are due to stress-induced phase transformation toughening of zirconia ceramics [4,5] which is mainly dominated by Y 2 O 3 dopant concentration and grain size [6][7][8].…”

Effect of dopants and sintering temperature on microstructure and low temperature degradation of dental Y-TZP-zirconia

“…Dopants are present in zirconia either as a distinct phase (Al 2 O 3 ) or as a solid solution like Y 2 O 3 and Fe 2 O 3 in small quantities. [46][47][48][49][50][51][52][53][54][55][56] They, however, influence the grain morphology, microstructure, mechanical properties and the stability of zirconia against LTD. 10,21,23,31,32,36,37,40,45,47,[56][57][58]78 Today the sintering of highly porous (∼50 vol.%) and then machined zirconia is widely used to obtain a dense ceramic with the mechanical and chemical properties required for dental restorations. The sintering conducted in solid state involves the diffusion of the ions across grain boundaries without the involvement of a liquid phase and its ability of large rearrangements of particles.…”