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Turbine blades used in jet engines can be made from such materials as nickel-based
superalloys. We can, in principle, even use ceramic materials such as zirconia or other alloys
based on steels. In some cases, the blades may have to be coated with a thermal barrier coating
(TBC) to minimize exposure of the blade material to high temperatures. What design parameters
would you consider in selecting a material for the turbine blade and for the coating that would
work successfully in a turbine engine? Note that different parts of the engine are exposed to
different temperatures, and not all blades are exposed to relatively high operating temperatures.
What problems might occur? Consider the factors such as temperature and humidity in the
environment that the turbine blades must function.
For such an application, one must consider a material with a very stable
microstructure. High temperatures may induce grain boundary creep. High humidity
environments can induce corrosion and......

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Approximate Word Count: 645
Approximate Pages: 3 (250 words per double-spaced page)

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