Chemical Engineering

Advanced Ceramic Coatings and Interfaces IV (Ceramic by Hua-Tay Lin, Dongming Zhu, Tatsuki Ohji, Andrew Wereszczak

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By Hua-Tay Lin, Dongming Zhu, Tatsuki Ohji, Andrew Wereszczak

This quantity is an invaluable source for knowing the main useful points of complex ceramic coatings and interfaces. Containing twelve contributed papers from the symposium, subject matters comprise vibration damping coatings, thermal and environmental barrier coating processing, trying out and existence modeling, non-destructive review, multifunctional coatings and interfaces, highlighting the state of the art ceramic coatings applied sciences for varied severe engineering functions.

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7° could not be exactly measured due to scattering effects, and no diffraction patterns of SÌ3N4 could be detected at all (Tab. III). For Mg-SN substrates coated with magnesium sol Mg5, Fig. 7b exhibits typical sub-surface flaws due to exaggerated oxidation. Lewis also describes a two-tier oxide structure which consisted of a crystallized silicate layer at the top of a glassy layer [26]. For the used Mg-SN substrates, oxidation data showed that the second heat-treatment did not only result in densification but also in re-oxidation triggered by an excess of Mg and a first oxide layer which was not dense enough to act as diffusion barrier.

5 μπι shows a narrow porous area at the SÌ3N4 interface. The bonding strength of these substrates to Cu was poor, independent of the substrate side used for Cu bonding. However, the observed blistering was the lowest of all investigated SÌ3N4 substrates in this paper as can be seen from the Cu strip in Fig. 7a. Fig. 7. Left: Mg-SN substrate coated with magnesium sol of composition Mg5 after bonding and peel testing and the corresponding Cu strip. Right: Corresponding SEM micrograph. Fig. 8a shows the Y-SN substrate coated with a magnesium sol of composition Mg5 and the corresponding Cu-strip after bonding and peel testing.

Although necessary by design, this clearance can have a disproportionately high influence on the stage efficiency. In general, an increasing tip clearance causes stage performance deterioration. The losses associated with the clearance are called tip leakage losses. As part of the overall blade losses, the turbine tip clearance loss arises because at the blade tip the working gas does not follow the intended flow path and therefore does not contribute to the turbine power output and interacts with the shroud wall boundary layer.

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