| Abstract: |
Thermal barrier coating (TBC) is a key component part of blades in hot section of gas turbine. TBC is composed of metallic bond coating and ceramic top coating. Previous commercial ceramic top coating is formed by Atmospheric Plasma Spraying (APS). Suspension plasma spraying (SPS) is one of the promising candidates to replace APS in thermal barrier coatings because of its advantages. SPS enables to feed submicron or nano-sized particles into the plasma flame and it causes the unique structural, mechanical, thermal properties of coating. In this research, ethanol based YSZ suspensions were injected into the plasma flame on various spraying conditions, such as plasma power, spray distance, and working pressure. Microstructures and porosities of YSZ coatings were investigated on each spray conditions. Thermal conductivity of YSZ coatings deposited by vacuum suspension plasma spraying (VSPS) showed lower than that of YSZ coatings deposited by APS.
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