Application of Micro-Raman Spectroscopy to the Study of Yttria-Stabilized Tetragonal Zirconia Polycrystal (Y-TZP) Phase Transformation

Autor(es)

Ramos, Carla MueIler ^[1] ; Tabata, Americo Sheitiro ^[2] ; Cesar, Paulo Francisco ^[3] ; Rubo, Jose Henrique ^[4] ; Silveira Fracisconi, Paulo Afonso ^[1] ; Sanches Borges, Ana Flavia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Dent Endodont & Dent Mat, BR-17012901 Bauru, SP - Brazil

^[2] Sao Paulo State Univ, Fac Sci, Dept Phys, Nucleo Habitac Presidente Geisel, BR-17033360 Bauru, SP - Brazil

^[3] Univ Sao Paulo, Fac Dent, Dept Biomat & Oral Biol, BR-05508000 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Bauru Sch Dent, Dept Prosthodont, BR-17012901 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Spectroscopy; v. 69, n. 7, p. 810-814, JUL 2015.
• Citações Web of Science: 5

Resumo

The aim of this study was to perform micro-Raman spectroscopy as an alternative and nondestructive method to identify the phase transformation of zirconia after mechanical stress. The groups evaluated were experimental zirconia, zirconcad, IPS e.max ZirCad, and In Ceram YZ. Ten specimens were constructed for each group (n = 30) and subjected to a three-point bending test with a crosshead speed of 0.5 mm/min. The fractured surfaces were analyzed by micro-Raman spectroscopy. The laser power was kept at 10 mW, and scanning was performed in three regions of the fractured surface: (i) near the source of the failure (region of tensile stress), (ii) central to the fractured surface, and (iii) far from the source of failure. All materials showed the characteristic bands of tetragonal and monoclinic phases of zirconia. All zirconia studied showed a monoclinic phase in the tensile stress region. Micro-Raman spectroscopy was effective in detecting the presence of crystalline phases in polycrystals ceramics. (AU)

• Processo FAPESP: 11/18061-0 - Análise mecânica, estrutural e de copings de zircônia experimental para uso em sistema CAD/CAM
• Beneficiário: Ana Flávia Sanches Borges
• Modalidade de apoio: Auxílio à Pesquisa - Regular