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Project Supported by VINNOVA Participants: Univ. West / Univ. Manchester, Hot Disk AB, VAC

Flexible Assessment of Thermal Transport Properties of Thermal Barrier Systems Measured by The Hot Disk Method Caroline Goddard 1 , Tobias Öhman 2 ; Nicolaie Markocsan 2 ; Mattias Gustavsson 3 , Lars Östergren 4 1-University of Manchester; 2-University West; 3-Hot Disk AB; 4-Volvo Aero.

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Project Supported by VINNOVA Participants: Univ. West / Univ. Manchester, Hot Disk AB, VAC

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  1. Flexible Assessment of Thermal Transport Properties of Thermal Barrier Systems Measured by The Hot Disk Method • Caroline Goddard1, Tobias Öhman2; Nicolaie Markocsan2; Mattias Gustavsson3, Lars Östergren4 • 1-University of Manchester; 2-University West; 3-Hot Disk AB; 4-Volvo Aero

  2. Project Supported by VINNOVA • Participants: Univ. West / Univ. Manchester, Hot Disk AB, VAC

  3. Requirements of Thermal Conductivity of TBCs • Performance of layers (lab) – LF • Lower-cost/flexible testing – HD • Quality Control? (on-line) – HD

  4. Hot Disk Sensor

  5. HD Technique – Apparent (Thin Film) vs. Bulk Properties

  6. Apparent Coating Properties - Setup

  7. Influence of Surface Roughness

  8. Comparisons LF vs. HD • The results show that it is possible to obtain comparable results between the Hot Disk method and the Laser Flash method for coatings A and B. • Coating C did not show agreement with LF.

  9. Comparisons LF vs. HD • The surface roughness has a significant effect. • It is possible to develop a method for measuring thermal conductivity of TBC by “Thin Films” apparent property approach. • Approach does not allow non-destructive testing. • Zirconia coatings range from 300µm thick to over 700µm thick and the method cannot reliably measure coatings 550µm or thicker. • ( Presently preparing for tests at elevated temperatures. )

  10. Other Possibilities – Quality Control? • APPARENT properties (less stable) if coating thinner than 0.5 mm • BULK properties (stable), only if coating thicker than 0.5 mm • Investigating inhomogeneous variations vs. depth from surface, for thicker coatings basis (on-line testing)

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