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

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter30: Electric Heat

Section: Chapter Questions

Problem 1RQ: The material often used to manufacture electric strip heater coils is ____.

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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: O a. To match the thermal conductivity of the TBC to the metal substrate b. To avoid breakage during change in thermal conditions O c. To match the thermal conductivity of the TBC to the underlying oxide layer Od. To increase the weight of the TBC O e. To prevent a change of the crystallographic structure as the temperature changes
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