| Abstract: |
This study uses suspension plasma spraying(SPS),developed a thermal barrier coating(TBC) with high life and good thermal insulation. Because aircraft gas turbine engines operate in harsh high temperature environments, The use of a thermal barrier coating allows the superalloy under the coating to be internally cooled, and also reduces the surface temperature of the superalloy, allowing the gas engine to operate at gas temperatures well above the melting temperature of the superalloy, thereby improving engine performance and efficiency, making the engine more durable.The use of suspension spraying can obtain top layers of different microstructures at relatively low cost, thereby increasing the life of the thermal barrier coating.In this experiment, isopropanol and commercial yttrium stabilized zirconia (8YSZ) powder were used to prepare the suspension, and then the prepared suspension was externally connected to atmospheric plasma spraying (APS) and then melted and deposited on the substrate. The effect on the coating was investigated by adjusting the working distance of the plasma gun tip and the amount of air pressure flow of the suspension atomization.After spraying the samples will go to x-ray diffraction analysis, scanning electron microscope, tensile tester, high-temperature heat cycle furnace and computer software to observe the composition, surface morphology and cross-section microstructure of the coating. The strength of the coating and the effect of porosity on the life of the coating were analyzed.
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