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Rotors, such as for gas turbine engines and the like, are typically
subjected to high stresses and high temperatures. Extensive efforts have
been made over the years to develop new alloys, new fabrication techniques,
and new component designs which permit operation of these rotors at higher
operating temperatures and/or which lead to lighter weight, longer lived
components. State-of-the-art designs of compressor and turbine rotors for
aircraft gas turbine engines are using integrally bladed rotor (IBR)
technologies (rotor and blades are one piece - continuous structure).
The advantage of this one-piece construction is weight savings and reduced
losses from cavity flows inherent with a bladed disk. The disadvantage comes
from the reduction of overall damping provided by the friction interface at
the blade/disk attachment. The DVD process has been used to make porous
columnar Ni- or Ti- alloy coatings to perform the bulk of the energy
conversion. A cellular NiTi shape memory alloy (SMA) has also been
investigated. The coatings consist of a compliant bondcoat, porous columnar
or cellular SMA and a constraining layer.
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