Nouvelle génération de machine de revêtement et futures applications dans les industries de l’aéronautique et des turbines à gaz
Le thermal spray est une technologie de revêtement qui développe des épaisseurs de 50 µm à quelques millimètres. Les particules sont projetées à grande vitesse sur une surface et solidifient immédiatement. Oerlikon nous fait état d’une nouvelle génération de machine de revêtements et de ses futures applications.
Figure 1: The SurfaceOne platform is build up by the process module (top image) and the coating module (bottom image).
Figure 2: Evolution of turbine entry temperature and maximum substrate temperature. The gap increased due to TBCs and airfoil cooling. [1]
Figure 3: A microscopic image of a typical porous TBC. The shown coating has a low thermal conductivity of 0.85 W/mK but a comparably low erosion resistance of 4.4 s/mil.
Figure 4: Dense TBC with a vertically cracked structure.
Figure 5: Dense TBC with a vertically cracked structure and a novel chemistry ZrO2-YbGdY .
Figure 6: Example of a dense TBC with high density of vertical cracks. The coating was produced from Metco 204NS-G with the SinplexPr spray torch.
Figure 7: Crack density in dependence of feedstock properties (left) and spray distance (right).
Table 1: Burner rig test thermal cycling of TBCs with different coating architecture and varying crack density.
Figure 8: Working principle of an abradable coating against an unshrouded blade.
Figure 9: Combinations of blade and abradable materials as they are used at different service temperatures in the compressor and turbine sections.
Figure 10: Typical cross-section of the ceramic abradable Metco 2395
Figure 11: Wear map of the ceramic abradable Metco 2395 simulating different service conditions in an aero turbine engine.
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