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Solid Particle erosion of thermal spray and physical vapour deposition thermal barrier coatings

pubblicazioni - Memoria

Solid Particle erosion of thermal spray and physical vapour deposition thermal barrier coatings

Sono presentati i risultati delle prove di erosione da particolato solido effettuate ad alta temperatura su campioni di rivestimenti ceramici con funzione di barriera termica utilizzati e/o di futuro impiego per la protezione delle parti calde delle turbine a gas per la produzione di energia elettrica o per la propulsione in campo aereonautico.

Thermal barrier coatings (TBC) are used to protect hot path components of gas turbines from hot combustion gases. Electron beam physical vapour deposition (EB-PVD) coatings have a columnar microstructure that guarantees high strain compliance and better solid particle erosion than PS TBCs. The main drawback of EB-PVD coating is the deposition cost that is higher than that of air plasma sprayed (APS) TBC. Nowadays segmented APS coatings and PS – PVDÔ have been developed to improve solid particle erosion of plasma sprayed TBCs .In this perspective standard porous APS, segmented APS, EB-PVD and PS – PVDÔ were tested at 700°C in a solid particle erosion jet tester, with EB-PVD and standard porous APS being the two reference systems.  Tests were performed at impingement angles of 30° and 90°, representative for particle impingement on trailing and leading edges of gas turbine blades and vanes, respectively. Microquartz and alumina were chosen as the erodents. After the end of the tests, the TBC microstructure was investigated using electron microscopy to characterise the failure mechanisms taking place in the TBC.

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