Abstract
Predicting “in-service” lifetime of ceramic thermal barrier coatings (TBCs) is difficult due to the inherent brittle nature of ceramics used. Therefore, the study of metal-based thermal barrier coatings (MBTBCs) has been initiated to challenge the current problems of ceramic-based TBCs (CBTBCs) and create a new generation of thermal barrier coatings (TBCs). In this work, nano/amorphous structured MBTBCs, for use in internal combustion engines, have been produced using high frequency induction plasma spraying (IPS) of iron-based nanostructured alloy powders. Coatings were deposited by IPS using various spray parameters and heat treated up to 850 °C to study the thermal stability of the coating. The thermal diffusivity (α) properties of MBTBCs were measured using a laser flash method. Density (ρ) and specific heat (C p) of the MBTBCs were also measured for calculating thermal conductivity (k = αρC p).
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Notes
A Rule of Mixture \( {\text{TC}}_{{{\text{Total}}}} {\text{ }} = {\text{ TC}}_{{{\text{Fe}}_{3} {\text{O}}_{4} }} {\text{WF}}_{{{\text{Fe}}_{3} {\text{O}}_{4} }} + {\text{TC}}_{{{\text{MBTBCs}}}} {\text{WF}}_{{{\text{MBTBCs}}}} ;\;\;{\text{TC}}_{{{\text{Fe}}_{3} {\text{O}}_{4} }} \) and TCMBTBCs are the thermal conductivity of Fe3O4 (=9.7 W/mK) and IPS-N2 MBTBCs as-sprayed (=1.99 W/mK); \( {\text{WF}}_{{{\text{Fe}}_{3} {\text{O}}_{4} }} \) and \( {\text{WF}}_{{{\text{MBTBCs}}}} \) are the percentages (fractions) of Fe3O4 and IPS-N2 MBTBCs as-sprayed, respectively.
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Shin, DI., Gitzhofer, F. & Moreau, C. Thermal property evolution of metal based thermal barrier coatings with heat treatments. J Mater Sci 42, 5915–5923 (2007). https://doi.org/10.1007/s10853-007-1772-x
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DOI: https://doi.org/10.1007/s10853-007-1772-x