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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 increase the weight of the TBC b. To match the thermal conductivity of the TBC to the underlying oxide layer To avoid breakage during change in thermal conditions d. To prevent a change of the crystallographic structure as the temperature changes To match the thermal conductivity of the TBC to the metal substrate C. e.THE PROBLEM IS FROM THE BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD.Carburizing is the process where: -manganese contributes to the strengthening of the material -the part is quenched in a bath of oil to decrease distorion -carbon is added to the outer layer of a steel part through absorbtion and diffusion. -a part is packed in a salt bath to increase durability
- 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 conditionsTo insulate a device against a high external temperature, which of the following are practical routes: Select one or more: O a. Create an outer layer with a solid shell filled with a porous material made out of a ceramic Ob. Assemble a high-strength metal alloy shell on the outside of the device Lay down a dense tough polymer coating Od. Plasma-deposit a dense, high strength ceramic coating C.Comparison: Indicate if , or = Better Stiffness: Gold Tungsten
- II- The bi-metallic thermome variation. (a) very high, (bFROM BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD8. An unretained solute passes through a chromatography column in 3.7 min and the analyte requires 8.45 min. (a) Find the adjusted retention time and retention factor for the analyte. (b) The volume of the mobile phase is 1.4 times the volume of the stationary phase. Find the partition coefficient for the analyte.
- What are hyphenated gas-chromatographic methods? Briefly describe three hyphenated methods.To insulate a device against a high external temperature, which of the following are practical routes: Select one or more: a. Lay down a dense tough polymer coating b. Assemble a high-strength metal alloy shell on the outside of the device C. Plasma-deposit a dense, high strength ceramic coating d. Create an outer layer with a solid shell filled with a porous material made out of a ceramica) Explain the functions of a plastic coatings. b) Assume you are a Mechanical engineer working in Al Jazeera Steel Company LLC is situated in Sohar. You are assigned a task to setup the system to coat the surface of the hot component dipped in oil. For example the dark blue colour steel gun is shown below. Based on the above scenario, answer the following questicns. i) Suggest the suitable surface coating process. ii) Explain the above surface coating process in detail.