Introduction
Process Schematics
The Jet
Technological Windows
Advantages
• Reduced Oxidation
Publications
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Advantages of AcuKote HVAF Coatings over Conventional Thermal Spray
| Advantageous Effect |
Cause |
Improvement in Coating Quality |
| Reduced or eliminated oxidation and thermal deterioration
(by how much?) |
Relatively low temperature in the AcuKote HVAF jet allows for
accurate heating of the spray material, in contrast with
conventional thermal spray where the jets are "too hot"
(plasma, HVOF, detonation spraying). As a result, material
fusion can be avoided, and the AcuKote HVAF spray particles see
little in-flight oxidation, because the diffusion of oxygen
in solids is 1,000-fold lower than in liquids. For similar
reasons, the AcuKote HVAF process avoids thermal decomposition
of spray materials, such as tungsten carbide.
|
- Toughness
- Hardness
- Fatigue resistance
- Chemical properties, including corrosion resistance
|
| Consistent quality of coating |
Accelerated to extremely high velocity, solid particles in a spray jet
blast away all deposited particles of poor quality, eliminating the
sources of possible defects.
|
- Consistency of coating quality on each part and from batch to batch
|
| Reduced residual stresses |
The impact of solid particles creates compressive stresses. During
spraying, they decrease tensile (residual) stresses generated due to
shrinkage of the cooling coating material.
|
- Tensile strength
- Technological efficiency (same coating quality within wide range of spray parameters)
- Coating thickness has little effect on quality
|
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