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Roll-to-Roll Low-Temperature CVD System for Tarnishing Copper Alloy Fasteners
Overview： We have successfully established an atmosphere-pressure, room-temperature, roll-to-roll CVD processes for tarnishing copper-alloy fasteners and changing the colors of such fasteners. A high through―put and large-size apparatus for continuous CVD treatment of fasteners was fabricated for mass-production.
Characteristic：
- CVD tarnish of Cu fasteners based on oxidation of Cu alloy by ammonia gas
- By changing the gas density, variety of colors (brown, blue, green, and black) have been realized.
- Inert gas curtain flanges at both ends of CVD chamber were developed, allowing fasters with complicated shapes go through the CVD chamber but air not go in the chamber.
- A catalytic decomposition of used ammonia gas was installed, giving 0 ppm of residual ammonia.
- The total CVD treatment speed of the system reached Max 5m/min.
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