Principles of Coating Technology

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GFE Schmalkalden e.V. Thermal spraying • Simple process • High variety of spray material • Generation of compound coatings possible Principles of Coating Technology II Resistance heater Diffuser gas Molten bath spraying Melt bath Deposit coating Spray jet GFE Schmalkalden e.V. Thermal spraying Flame spraying: using flame as energy source Advantages: • Wide variety of spray materials • Low equipment costs (
GFE Schmalkalden e.V. Thermal spraying Wire flame spraying Typical process parameters • Oxygen flow rate: 1,5 Nm 3 /h • Fuel flow rate: 1,2 Nm 3 /h • Compressed air consumption 60 Nm 3 /h, @ 4 – 6 bar • Spray distance: 75 – 150 mm • Deposition rate 8 kg/h (Metalle) Wire feeder Fuel / oxygen mixture Wire Principles of Coating Technology II Compressed air Melting wire Spray materials • brittle materials (oxides, nitrides borides and compound powders) as cored wire • ductile materials as massive wire application • adhesion layers (NiAl, NiCr, Mo) • corrosion protection (Zn, Al, ZnAl) • wear protection (Mo) GFE Schmalkalden e.V. Thermal spraying powder flame spraying Typical process parameters • Oxygen flow rate: 1,5 Nm 3 /h • Fuel flow rate: 1,2 Nm 3 /h • Spray distance: 75 – 150 mm • Deposition rate 2-6 kg/h (metals) • Flame temperature: max. 3.160°C (C 2H 2 – O 2) Principles of Coating Technology II Blowing gas Fuel / oxygen mixture • Powder material metals, alloys, ceramics • Powder grain size 20 µm > d max > 12 µm • Particle velocity 50 m/s • Substrate materials metal, ceramics, wood, plastics, paper Powder injector Flame Spray jet 13 14 7
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Principles of Coating Technology

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