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Detonation Spray
Oxygen and fuel (acetylene most common) is fed into the barrel along with a charge of powder. A spark is used to ignite the gas mixture and the resulting detonation heats and accelerates the powder to supersonic velocity down the barrel. A pulse of nitrogen is used to purge the barrel after each detonation. This process is repeated many times a second. The high kinetic energy of the hot powder particles on impact with the substrate results in build up of a very dense and strong coating.
Characteristics of Detonation Spray Coating
| Material Form | Powder |
|---|---|
| Heat Source | Charge Detonation |
| Flame Temperature (°C) | 1,500 to 4,000 |
| Particle Velocity (m/sec) | 600 to 1,200 |
| Porosity (%) | < 1 |
| Coating Adhesion (MPa) | > 70 |
Advantages
Disadvantages
- Excellent bond strength
- Very dense coatings
- Better coating characteristics of hardness, wear & corrosion resistance
- Versatile process, ensuring wide range of coatings
- Low process temperature enables spraying of precision components
- Higher thickness coatings easily possible
- Very slow process as the coating is intermittent
- Comparatively low coating efficiency
- Very high noise emission