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Wire Flame Spray
The process is basically the spraying of molten metal onto a surface to provide a coating. Material in wire form is melted in a flame (Oxy-Acetylene flame most common) & atomised using compressed air to form a fine spray. When the spray contacts the prepared surface material, the fine molten droplet rapidly solidify forming a coating.
Characteristics of Wire Flame Spray
| Material Form | Wire |
|---|---|
| Heat Source | Oxy-Fuel Combustion |
| Flame Temperature (°C) | 3000 |
| Particle Velocity (m/sec) | < 300 |
| Porosity (%) | 10 to 15 |
| Coating Adhesion (MPa) | 14 to 21 |
Advantages
Disadvantages
- Simple to operate
- Wire form cheaper than powder
- Very high deposit efficiency
- It has a portable system and can be used in areas without electricity
- Possibly still best for applying pure Molybdenum coatings
Disadvantages
- Limited to spraying material supplied in wire or rod form
- Coatings have higher porosity and lower bond strength
- Not capable of spraying low oxide, high density & high strength coatings