Production and characterization of Alumina-Titania-ítria ceramics composites for thermal barrier aerospace exhaust system.
| Reference | Presenter | Authors (Institution) | Abstract |
|---|---|---|---|
| 09-101 | YOGENDRA PRASAD YADAVA | De Albuquerque, L.T.(UNIVERSIDADE FEDERAL DE PERNAMBUCO); GOMES, N.L.(Universidade Federal de Pernambuco); Ferreira, R.A.(Universidade Federal de Pernambuco); YADAVA, Y.P.(UNIVERSIDADE FEDERAL DE PERNAMBUCO); | In aerospace industry, Gas turbines, which are
responsible for aircraft propulsion, have exhaust nozzles formed by a set of
nickel or cobalt-based alloys, and are among the most prematurely failed
equipment due to such elevated temperatures. Therefore, turbine manufacturers are looking for
an improvement in these hot section components. Ceramic composites can be a
solution, since these materials have the capacity to withstand high
temperatures and require less air cooling, besides the possibility of acquiring
lighter parts for their equipment, aiming to optimize the performance of these
systems and achieve lower fuel consumption. Previous studies have shown that
alumina-based ceramics incorporated with other oxides, present higher
mechanical properties than other ceramic materials, obtaining properties such
as chemical stability, resistance to high temperatures and fracture toughness. In
the present work, Alumina-titania ceramic composites (Al2O3-TiO2) incorporated
with rare earth oxide (Y2O3), varying the content of yttrium oxide by 5%, 10%
and 15% were produced for aerospacial application The composites were produced
by thermo mechanical process and sintered at 1350 ° C. The structure,
microstructure and mechanical properties of the composites were studied by
X-ray diffraction, relative density, scanning electron microscopy and Vickers
micro hardness. The results showed good homogeneity in distribution and
particle size. The Vickers micro hardness test for composites of 10 and 15% of
yttria obtained close results when compared to the 5% of yttria, which have higher
values. The results indicate good <!--[if gte mso 9]> |
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