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Coating process
Properties |
Thermal spraying (HVOF, Plasma, Gun, Cold spray,...) |
Traditional welding (TIG, MIG, MAG, PTA, Open arc, …) |
Diod laser cladding |
| Heat sorce |
Combustion flame, electric or plasma arc |
Arc, plasma |
Infrared beam |
| Bond strength |
Low: mechanical bonding |
High: metallurgical bonding |
High: metallurgic bonding |
| Coating structure |
Lamellar; from porous to dense (*) |
Dense -cracks and pores may exist (*) |
Dense - no porosity |
| Process reproductibility |
High |
Low |
Very high |
| Heat input to the substract |
Very low to moderate (*) |
Very high |
Low |
| Substract deformation |
Nil to low |
High |
Nil to low |
| Dilution |
Nil |
Moderate to high ('buttering' layer) |
Low (<5%) |
| Coating thickness |
0,05 to 1 mm |
1mm to cm |
Between 0,5 et 2 mm per layer; several mm |
| Coating nature |
Large choice of metal matrix, alloys, ceramics, polymers and hardfacing alloys |
Metal, alloys, Hard alloys, alloys with hard particles |
Metal, alloys, Hard alloys, alloys with hard particles including diamond |
| (*) Depends on the type of proces |
