车灯镀铝工艺.ppt

* * * ? Copyright by Automotive Lighting Reutlingen GmbH Metalizing Process Venaria – 18th-27th January 2010 – Surface Treatment Training ? copyright by Automotive Lighting The metalizing process can be done with 2 technologies: Thermal evaporation Sputtering In our company we use both Introduction of Metalizing process ? copyright by Automotive Lighting Evaporation is a common method of thin film deposition. The source material (small bars ) is evaporated by joule effect in a high vacuum. The high vacuum allows vapor of Al put to travel directly to substrate, where they condense back to a solid state. The metalizing phase is anticipated from a medium vacuum, where we do a plasma to eliminate humidity and particles (clean of substrate). The Al must be protected to avoid oxidation, so we do protection with silicon oils distributed in a medium vacuum which become oligomers by plasma treatment. Thermal evaporation Thermal evaporation Process ? copyright by Automotive Lighting Diffusion pumps root pump Mechanical pump ? copyright by Automotive Lighting Thermal evaporation process Ionization Vacuum 1 E-1 mbar; 300±20 mA at 1500±200 V Rotation 10 turn/min Carrier: air 60 s Aluminizing by Joule effect Pre-heating Vacuum 1 E-4 mbar 2.5 ±0.5 V 3 s Evaporation Vacuum 1 E-4 mbar 5.0 ±0.5 V Rotation 12 turn/min 11 s Cooling Rotation 10 turn/min 10 s Protection Vacuum 1 E-1 mbar 350±50 mA; 4000±500 V Carrier: Air/hexamethildisiloxane Between 180-240 s (Total Cycle Time 15 min.) ? copyright by Automotive Lighting Thermal evaporation process Tungsten filament Aluminum coil The design of pieces and the position on the jigs are important to guarantee a good evaporation , but even tungsten filament and the Al coils are fundamental for the process. ? copyright by Automotive Lighting Thermal evaporation process By the ways of tungsten filaments It’s important to verify the good condition of work ? copyright by Automotive Lighting Sputtering p