|
| Abstract No.: |
|
Scheduled at:
|
Thursday, June 11, 2020, Hall G1 10:20 AM
HVOF/HVAF Spraying
|
|
| Title: |
High-velocity air-fuel (HVAF) spraying utilizing suspensions for enhanced wear behaviour
|
|
| Authors: |
Shrikant Joshi* / University West, Sweden
Stefan Björklund / University West, Sweden
Satyapal Mahade/ University West, Sweden
Lidia Baiamonte/ University West, Sweden
|
|
| Abstract: |
Thermal spraying with suspensions that comprise fine particles (100 nm - 5 µm diameter) has been known to provide a unique pathway to obtain coatings with characteristics that differ significantly from conventional powder-derived layers. Following the immense promise shown by suspension plasma spraying for potential thermal barrier applications, both plasma and high-velocity oxy-fuel (HVOF) spraying of oxide and carbide suspensions to develop a new generation of wear-resistant layers are being explored. However, there have been no prior efforts utilizing suspension feedstock in high-velocity air-fuel (HVAF) spraying. This paper describes HVAF spraying of hybrid powder-suspension feedstock to conveniently create novel composite coatings by simultaneously feeding a coarse spray-grade powder and a fine sub-micron sized particulate suspension. The feeding arrangement conceived to overcome high back-pressure to realize reliable introduction of the dual feedstock is presented. Prominent results obtained from comprehensive characterization of coatings produced using illustrative material systems (e.g., IN625 powder + Cr3C2 suspension) for their microstructure, mechanical properties and wear resistance will also be discussed.
|
|