EFFECTS OF POST-COATING PROCESSING ON STRUCTURE AND EROSIVE WEAR CHARACTERISTICS OF FLAME AND PLASMA SPRAY COATINGS

The effects of post-coating processing by means of flame, laser and va cuum furnace heating on the structure and erosive wear characteristics of flame and plasma spray coatings were studied. The results show tha t post-coating processing can modify the microstructure, reduce its po rosity, increase its plasticity and toughness and improve the metallur gical bonding to the substrate. Therefore, the erosion resistence of t hese deposits is increased substantially and is even more significant when the erodent impact angle and impact velocity are higher. The mech anism of erosive wear has obviously changed from brittle to plastic er osion. The application of different spray methods and post-coating pro cessing in terms of erosive wear was analysed and compared.