Abstract
A Fe/Al composite coating was prepared by cold spraying using an iron-aluminium powder mixture with a Fe/Al atomic ratio of 1:1. The effect of annealing temperature on the intermetallic compound formation in the cold-sprayed Fe/Al coating was investigated. The as-sprayed and annealed coatings were characterized by x-ray diffraction (XRD), and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy. Results showed that intensive particle deformation on impact promoted the Fe 2Al 5 intermetallic compound formation at a low annealing temperature of 450°C and this intermetallic layer firstly appeared along some intimate contact regions at the aluminium-iron boundaries. The amount of the Fe2Al5 intermetallic compound increased and no other intermetallic compound phases appeared when the annealing temperature was raised from 450 to 600°C. Some cracks developed in the Fe2Al5 intermetallic layer when the coating was annealed at 600°C and the possible causes leading to evolution of cracks are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 571-577 |
| Number of pages | 7 |
| Journal | Journal of Thermal Spray Technology |
| Volume | 21 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Jun 2012 |
Keywords
- Annealing
- Coating
- Cold spray
- Fe/Al composite
- Intermetallics
- Microstructure