Abstract
The aim of the investigation was to synthesize 3 mol% yttria-stabilized zirconia (3Y-TZP) powders via polymeric precursor method (PPM). The precursor solution was preheated at 350ºC for 3h, subsequently thermally treated at 500ºC for 3h and 800ºC for 6h. The obtained materials were analyzed by Thermogravimetry-Derivative Thermogravimetry (TG/DTG), Differential Thermal Analysis (DTA), powder X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Two commercially available Y-TZP ceramic systems were chosen for comparison. XRD analysis of the synthesized 3Y-TZP powders revealed the crystallization of the tetragonal phase, while both commercial systems showed the coexistence of the monoclinic and tetragonal phases. SEM analysis showed that the powders thermally treated at 800°C consist of agglomerated spherical nanoparticles. Morphology of commercial systems also revealed nanosized spherical particles. Results revealed that the PPM led to ceramics with structural and morphological properties comparable to commercially available reinforced dental ceramics.
Highlights
Zirconia is a polymorph and its crystals can be organized in three different crystallographic phases: monoclinic phase (M), cubic phase (C) and tetragonal phase (T), which has mechanical properties improved (Garvie et al, 1975; Piconi & Maccauro, 1999)
The final mechanical properties of Y-TZP ceramics depend on some parameters, including the fraction of grains retained in the tetragonal phase at room temperature that is depended on, the grain size and shape, yttria content, and the degree of restriction exerted on them by the matrix (Guazzato et al, 2004; Muñoz-Tabares et al, 2011; Zhang & Lawn, 2018; Uz et al, 2020)
The choice of polymeric precursor method (PPM) as a chemical route proved to be efficient in producing crystalline and single-phase 3 mol% yttria-stabilized zirconia powders (3Y-TZP) ceramic powders
Summary
Zirconia is a polymorph and its crystals can be organized in three different crystallographic phases: monoclinic phase (M), cubic phase (C) and tetragonal phase (T), which has mechanical properties improved (Garvie et al, 1975; Piconi & Maccauro, 1999). The addition of 3 mol% of yttrium oxide allows the stabilization at room temperature of polycrystalline zirconia in its tetragonal phase (3Y-TZP). This zirconia has as favorable characteristics, the size of its grain, on the order of hundreds of nanometers, and the process of tenacification that inhibits the propagation of cracks (Miyazaki et al, 2013; Chevalier, 2006; Miragaya et al, 2017). The final mechanical properties of Y-TZP ceramics depend on some parameters, including the fraction of grains retained in the tetragonal phase at room temperature that is depended on, the grain size and shape, yttria content, and the degree of restriction exerted on them by the matrix (Guazzato et al, 2004; Muñoz-Tabares et al, 2011; Zhang & Lawn, 2018; Uz et al, 2020)
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