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What are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade? Select one or more: a. To match the thermal conductivity of the TBC to the metal substrate b. To increase the weight of the TBC c. To prevent a change of the crystallographic structure as the temperature changes d. To match the thermal conductivity of the TBC to the underlying oxide layer e. To avoid breakage during change in thermal conditions

What are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade? Select one or more: a. To match the thermal conductivity of the TBC to the metal substrate b. To increase the weight of the TBC c. To prevent a change of the crystallographic structure as the temperature changes d. To match the thermal conductivity of the TBC to the underlying oxide layer e. To avoid breakage during change in thermal conditions

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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What are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade?

Select one or more:
a.

To match the thermal conductivity of the TBC to the metal substrate

b.

To increase the weight of the TBC

c.

To prevent a change of the crystallographic structure as the temperature changes

d.

To match the thermal conductivity of the TBC to the underlying oxide layer

e.

To avoid breakage during change in thermal conditions

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