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3708 |
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Thursday, May 22, 2014, Hall H1 10:00 AM Aviation Industry 2 |
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The impact of nano-structured feedstock and thermal spraying to improve turbine efficiency in aerospace engine performance |
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Sofia Soares* / Innovnano - Materiais Avançados, S.A., Portugal Nuno Neves/ INNOVNANO Materiais Avançados S.A., Portugal Marisa Rodrigues/ INNOVNANO Materiais Avançados S.A., Portugal Ana Lúcia Lagoa/ INNOVNANO Materiais Avançados S.A., Portugal João Calado/ INNOVNANO Materiais Avançados S.A., Portugal |
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Nanostructured feedstock is finding an increasingly prominent place in the production of aircraft TBCs improving efficiency within the aerospace industry. It can be used in thermal spraying to create thinner coatings, minimizing component weight without compromise performance. Innovnanos 4 mol% yttria stabilized zirconia (4YSZ) nanostructured powder, with excellent mechanical and physical properties, is ideal for the production of finely structured layers. However, coating behavior is strongly dependent on the deposition technique: Air Plasma Spraying (APS) or Suspension Plasma Spraying (SPS). By APS, Innovnanos 4YSZ shows amazing properties for TBCs: the coatings have bimodal structure (micro and nanostructured grains) with homogeneous chemical composition and good phase distribution. The thermal behavior shows incredible properties, not failing after more than 120 cycles at 1300ºC-1375ºC. Thinner coatings are produced (<0.3 mm), without compromising the thermal diffusivity. SPS improves the overall performance, producing a thin but dense nanostructured ceramic coating, ensuring thermal insulation, chemical inertness and hardness for maximum protection against extreme environments. Innovnanos 4YSZ ethanol suspensions produce a columnar structure ensuring mechanical properties of the TBCs with low thermal conductivity, high melting points and excellent adhesion to the metallic substrates. As a result of Innovnanos unique manufacturing process (Emulsion Detonation Synthesis), 4YSZ suspensions do not need any dispersants, making the ceramic powder less expensive and reducing the number of controllable variables that can affect the final suspensions. |