Deposition techniques

Flame spraying troubleshooting

Problems with your flame spraying process?

Problem Cause Solution
Deposit peels off

1. Poor preparation of the surface (oxidized or oily surface)
2. Required surface roughness is >Ra 5
3. Too low preheating temperature
4. Too high preheating temperature

Clean the surface well
Sand blast well
Preferable >Ra10
Increase preheat
Decrease preheat

Cracks

1. Overheating
2. Too fast cooling
3. Hardened base material

Slower cooling / controlled cooling

Porosity

1. Poor preparation of the surface

2. Incorrect spray parameters
3. Incorrect spray distance
4. Poor sealings in the gun
5. Incorrect particle distribution for the gun
6. Too high oxygen level in the powder /oxidized powder
7. Powder contains hollow particles

Clean the surface well. 
Sand blast well.
Adjust parameters
Adjust distance
Replace seals
Choose the right parameter
Adjust lambda
Replace powder

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Technical area: Surface coating
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