Principles of Coating Technology

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GFE Schmalkalden e.V. Thermal spraying Surface pre-treatment Pre treatment absolute necessary for a sufficient coating adhesion Removal of oils, lubricants, paints, oxides and scales Pre treatment methods: • Removal of coarse contamination: grinding, turning, … • Degreasing of the substrate: dissolvent bath, steam cleaning, ultrasonic cleaning, …) • Blast cleaning for an increased surface roughness (important: removal of blasting material) Objective of pre-treatment: improvement of surface energy (surface activation) Principles of Coating Technology II GFE Schmalkalden e.V. Thermal spraying Spray material • Powder, rods, wires • Hard metals and alloys • Powder size 1 mm … mm Principles of Coating Technology II Hard material Metallic hard material Non metallic hard material Hard metal Hard alloy 7 8 4
GFE Schmalkalden e.V. Thermal spraying Classification of thermal spay methods Heat generation by combustion • Flame spraying • Detonation spraying • High velocity oxygen fuel (HVOF) 20 15 10 Principles of Coating Technology II process temperature Prozesstemperatur [1000 °C] 5 0 0 Lichtbogen- Arc spritzen spraying Flame Flamm- spraying spritzen: wire Draht Plasma spraying spritzen Pulver powder HVCW HVOF, D-Gun by electrical heat generation • Arc spraying • Plasma spraying • Laser spraying Cold Gas Dynamic Spraying (CGDS) EPD 0.5 1.0 1.5 2.0 Partikelgeschwindigkeit Particle velocity [1000 m/s] GFE Schmalkalden e.V. Thermal spraying Classification of thermal spay methods Temperature art nozzle exit Principles of Coating Technology II Molten bath spraying Spray material Metals and metal alloys with melting point < 300 °C Flame spraying Arc spraying Plasma spraying 300 °C 3000 °C 4000 °C 20000 °C Metals and metal alloys with melting point < 3000 °C, partial thermoplastics examples SnBi-alloys Zn, Al, Cu, Ni, Cr, CrNi-rods, NiCralloys Shape of spray material Apllication areas Tool and model production Metals and metal alloys with melting point < 400 °C Metalls, alloys, metal oxides, ceramics Zn, Al, Cu, Ni Cu, Fe, Ni, Ta, W, Mo, Ti, Carbides, Borides, nitirides, silicides Block, rod Wire, powder, rod wire powder corrosion and wear protection, maintenance, tool production, thermal insulation 9 10 5
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Principles of Coating Technology

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