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Powder Flame Spray
Material in powder form is melted in a flame (Oxy-Acetylene or Hydrogen most common) to form a fine spray. When the spray contacts the prepared surface of a substrate material, the fine molten droplets rapidly solidify forming a coating.
The main advantage of this process over the similar wire flame spray process is that a much wider range of materials can be easily processed into powder form giving a larger choice of coatings.
Characteristics of Powder Flame Spray
| Material Form | Powder |
|---|---|
| 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
- High production spray rates
- Easy to operate & portable
- Large choice of coating materials
- Can be easily automated
- Porosity in the range of 10 - 15%
- Lower bond strength in comparison to other process
- High oxide level for metal deposits