Low–thermal–conductivity and high–toughness CeO2–Gd2O3 co–stabilized zirconia ceramic for potential thermal barrier coating applications

Ceramic-metal composites also known as functionally gradient materials (FGM) are composite materials which are fabricated in order to have a gradual variation of constituent materials’ thermal and mechanical properties so as to have a smooth variation of the material properties in order to improve the overall performance and reduce the thermal expansion mismatch between ceramic and metal. The objective of the study is to determine the thermal properties of various percentage composition of Yttria stabilized zirconia-Nickel mixtures for application as thermal barrier coating materials in automotive turbocharger turbine volute casing. Specific heat capacity of different percentage composition of ceramic-metal powder composite were determined using DSC822 differential scanning calorimeter (Mettle Tolodo, Switzerland) at temperature ranges between 303K to 873K. While the thermal conductivity of the different percentage composition of ceramic-metal composite structures were determined using P5687 Cussons thermal conductivity apparatus (Manchester, UK) which uses one-dimensional steady-state heat conduction principle. The results have indicated that the specific heat capacity of the FGM increases sharply with an increase in temperature while the thermal conductivity of the FGM decreases with an increase in temperature. These results strongly agree with the theoretical and experimental values as well as the rule of mixtures obtainable in literature, which indicated the suitability of these FGM materials for thermal barrier coating applications.

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Effect of Oxidation and Mechanical Properties of Low Thermal Conductivity Material Coated on IN718 by Thermal Barrier Coating

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2020.31459 ◽

2020 ◽

Vol 8 (9) ◽

pp. 354-359

Author(s):

K Mugesh

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Thermal Barrier Coating ◽

Thermal Barrier ◽

Low Thermal Conductivity ◽

Barrier Coating

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Low-Thermal-Conductivity Rare-Earth Zirconates for Potential Thermal-Barrier-Coating Applications

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.2002.tb00574.x ◽

2004 ◽

Vol 85 (12) ◽

pp. 3031-3035 ◽

Cited By ~ 430

Author(s):

Jie Wu ◽

Xuezheng Wei ◽

Nitin P. Padture ◽

Paul G. Klemens ◽

Maurice Gell ◽

...

Keyword(s):

Thermal Conductivity ◽

Rare Earth ◽

Thermal Barrier Coating ◽

Thermal Barrier ◽

Low Thermal Conductivity ◽

Barrier Coating

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The Thermal Conductivity of 8 Yttria Stabilized Zirconia and Mullite Thermal Barrier Coating on Medium Carbon Steel Substrate

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a3022.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 5886-5892

Keyword(s):

Thermal Conductivity ◽

Carbon Steel ◽

Thermal Barrier Coating ◽

Steel Substrate ◽

Medium Carbon Steel ◽

Yttria Stabilized Zirconia ◽

Thermal Barrier ◽

Stabilized Zirconia ◽

Medium Carbon ◽

Barrier Coating

Thermal conductivity is one of the main features of a thermal barrier coating (TBC) that is important in making sure that the TBC gives its best functionality to the system. A good TBC has low thermal conductivity, so that the temperature can drop across the coating which allows the system to operate in extremely high temperatures. There are several factors that can influence the thermal conductivity of the TBC such as the type of ceramic material used, the deposition method and the physical features of the TBC itself. For this research, air plasma spray (APS) is used to deposit 8 wt% yttria stabilized zirconia (8YSZ) and mullite on medium carbon steel substrates to study their respective thermal conductivities. The aim here is to develop a heat shield using TBC to protect the electric motor in an electrical turbocompounding system. The characteristics of the deposited TBC such as microstructure, element composition, phases and thermal conductivity are studied. The thermal conductivity is reduced when medium carbon steel substrate deposited with TBC. The thermal conductivity of 8YSZ, mullite and uncoated sample at minute 60 is 0.868 W/mK, 0.903 W/mK and 1.057 W/mK, respectively. Therefore, the deposition of 8YSZ TBC can lower the thermal conductivity of the medium carbon steel heat shield.

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