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Protective coatings for chalcogenide glass molding

: Friedrichs, Marcel; Staasmeyer, Jan-Helge; Dambon, Olaf; Klocke, Fritz

Michailidis, Nikolaos ; Laboratory for Machine Tools Manufacturing Engineering:
13th International Conference THE "A" Coatings in Manufacturing Engineering 2017 : 6th International Conference on Manufacturing Engineering, 5-6 October, 2017, Thessaloniki, Greece
Thessaloniki, 2017
ISBN: 978-618-80878-5-9
International Conference THE "A" Coatings in Manufacturing Engineering <13, 2017, Thessaloniki>
International Conference on Manufacturing Engineering <6, 2017, Thessaloniki>
Conference Paper
Fraunhofer IPT ()
Beschichtung; Fertigungstechnik; Oberflächentechnik; Optik; Umformtechnik; Werkzeug- und Formenbau; precision glass molding; protective coating; infrared glass; degradation mechanism

Driven by high-priced technical devices such as thermal imaging cameras, molding of infrared glass is recently a rapidly growing market. To ensure an efficient infrared glass molding process, protective coatings are required to prevent the degradation of the molding tools. For this reason, this work investigates the operational capability of protective coatings for chalcogenide glass molding. Two nitride-based coatings and a precious metal coating were tested. Heating tests as well as molding tests were carried out on industrial glass molding machines. Analyzing subsequent degradation mechanisms, light microscopy, white light interferometry, scanning electron microscopy and transmission electron microscopy were performed. In conclusion, a CrAlN coating could be identified that can withstand thermochemical and thermomechanical loads in precision molding of chalcogenide glass.