Influência da alta pressão na síntese hidrotérmica de zircônia (ZrO2)
The development of new materials from new compositions occupies considerable space in the field of materials science and engineering. However, promoting changes in already known materials or even establishing adaptations of already established processing techniques presents a huge potential for i...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/46382 |
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| Resumo: | The development of new materials from new compositions occupies
considerable space in the field of materials science and engineering. However,
promoting changes in already known materials or even establishing adaptations of
already established processing techniques presents a huge potential for innovation
and effect in the industry. The hydrothermal synthesis method is sometimes
considered obsolete, but modifications of the technique can allow obtaining materials
with modified characteristics. This work promoted the hydrothermal syntheses of
zirconium oxide with adaptation for pressure control by injecting innert gas and
verified its effect on crystallographic and microstructural characteristics of the
nanostructured produced materials. In addition, a calcination treatment was carried
out to verify its effect on the characteristics of the materials. Traditional synthesis with
autogenous pressure produced, according to X-ray diffraction (XRD) and scanning
electron microscopy (SEM-FEG) analysis, nanoparticles composed of cubic and
monoclinic phases, while gas injection promoted the formation of monoclinic and
tetragonal phases even without the addition of dopants and at only 180°C for 20h.
Calcination produced a total stabilization of the monoclinic phase in all samples, in
addition to causing an increase in crystallite size due to the occurrence of diffusive
processes typical of the sintering phenomenon. |
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