Nanosecond-laser patterning of 3Y-TZP: damage and microstructural changes
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The aim of this study is to characterize in detail the microstructural changes and collateral damage induced by direct laser patterning on the surface of dental-grade zirconia (3Y-TZP) employing an interference setup with the 532 and 355. nm harmonics of a Nd:YAG laser (pulse duration of 10. ns).Laser-material interaction mainly results in thermal effects for both wavelengths studied. Upon laser irradiation the material locally melts producing pattern and establishing a steep thermal gradient on the surface. This generates a. ~. 1. µm thick heat affected zone where microcracking, directional recrystallization, phase transformation (from tetragonal to monoclinic, t ¿. m) and texturization (ferroelastic domain switching) take place. In addition, surface coloration results from the activation of F-centers as a consequence of high energy radiation exposure. No chemical segregation or diffusion was detected. All these microstructural changes should be taken into account to ensure integrity and long-term reliability of the zirconia components.
CitationRoitero, E., Lasserre, F., Roa, J.J., Anglada, M., Mücklich, F., Jimenez-Pique, E. Nanosecond-laser patterning of 3Y-TZP: damage and microstructural changes. "Journal of the european ceramic society", Desembre 2017, vol. 37, núm. 15, p. 4876-4887.