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Risultati sfruttabili
This research programme was successful mainly for zirconiacoatings. Laser sealing and strengthening of plasma sprayed zirconia coatings could generate high performance thermal and chemical barrier coatings. For diesel engines, the next step should be testing zirconia coated piston crowns and exhaust valves in operating conditions. Concerning gas turbine engines, further investigations are required, at temperatures above 1000 C, in terms of corrosion, oxidation, erosion and thermal cycling. The possible components are combustion chambers, first stage static vanes, and possible rotor blades.
A laser tool which is reliable, flexible and easily controlled for future process automation has been designed. The device includes a 3 kW carbon dioxide laser, a 3 axes table, power feeder and a fast pyrometer for measuring surface temperatures. The methodology was first to investigate the beam parameters and possible powder flows in single laser scan, to define optimal zones of treatment. The next step was to optimise the best treatments in multi-scanning with overlapped laser tracks to achieve suitable samples for thermo-mechanical testing.
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