Image Characterization after SEM Analysis for Equimolar Samples of Nb2O5-YTZP

Author(s)

Guimaraes, Nara Miranda ; Pereira Reis, Danieli Aparecida ; de Moura Neto, Carlos ; Piorino Neto, Francisco ; Kruszynski de Assis, Joao Marcos ; Perez, CA ; DeSouza, AM

• Document type: Journal article
• Source: X-RAY OPTICS AND MICROANALYSIS; v. 1437, p. 5-pg., 2012-01-01.

Abstract

The turbines are usually recovered by ceramic coatings to guarantee higher temperatures as well lower degradation through hostile environments. These primary systems are composed by yttria-stabilized zirconia (YSZ), but new researches have found that the presence of rare-earth oxides, like Ta2O5/ Nb2O5 can increase the efficiency of mechanical properties for coatings. The lack of knowledge in this system leads this study with niobia, because of high production of them in Brazil. Samples made of 16% mol of Y2O3 and Nb2O5 were done with zirconia, that composition was used because there are traces of tetragonal phase stabilization, which is related to the best properties of the TBC. SEM images were obtained and by using a ImageJ software were done a microstructural analysis. It was possible to reveal the format of the grains, which appear to be equiaxials, their size, to be around 3 mu m, and the phases presented were revealed after thermal attack. (AU)

• FAPESP's process: 09/13154-0 - Characterization and Thermodinamic of Thermal Barrier Coatings to application in Turbines.
• Grantee: Nara Miranda Guimarães
• Support Opportunities: Scholarships in Brazil - Master