Thermal barrier coating by electron beam-physical vapor deposition of zirconia co-doped with yttria and niobia
AUTOR(ES)
Almeida, Daniel Soares de, Cairo, Carlos Alberto Alves, Silva, Cosme Roberto M., Nono, Maria do Carmo A.
FONTE
J. Aerosp. Technol. Manag.
DATA DE PUBLICAÇÃO
2010-08
RESUMO
Abstract: The most usual ceramic material for coating turbine blades is yttria doped zirconia. Addition of niobia, as a co-dopant in the Y2O3-ZrO2 system, can reduce the thermal conductivity and improve mechanical properties of the coating. The purpose of this work was to evaluate the influence of the addition of niobia on the microstructure and thermal properties of the ceramic coatings. SEM on coatings fractured cross-section shows a columnar structure and the results of XRD show only zirconia tetragonal phase in the ceramic coating for the chemical composition range studied. As the difference NbO2,5-YO1,5 mol percent increases, the tetragonality increases. A significant reduction of the thermal conductivity, measured by laser flash technique in the zirconia coating co-doped with yttria and niobia when compared with zirconia-yttria coating was observed.
Documentos Relacionados
- Yttria and ceria doped zirconia thin films grown by pulsed laser deposition
- Eco-Friendly Luminescent Hybrid Materials Based on EuIII and LiI Co-Doped Chitosan
- JUDD-OFELT ANALYSIS OF Tb3+ AND UPCONVERSION STUDY IN Yb3+-Tb3+ CO-DOPED CALIBO GLASSES
- Effects of Heat Treatment and Yb 3+ Concentration on the Downconversion Emission of Er 3+ /Yb 3+ Co-Doped Transparent Silicate Glass-Ceramics
- Cation size effects-modified phase and PTCR development in Er3+ and Ca2+ co-doped BaTiO3 ceramics during sintering