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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Deposition, Machining and Measuring of Novel Hard Coatings
verfasst von : Gert Goch, Don Lucca, Andreas Mehner, Helmut Prekel, Heinz-Rolf Stock, Hans-Werner Zoch
Erschienen in: Fabrication of Complex Optical Components
Verlag: Springer Berlin Heidelberg
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Optical molds for precision glass pressing are frequently coated to improve their wear and oxidation resistance, and to reduce sticking of the hot glass to the mold surface during the glass pressing process. Currently PVD (Ti,Al)N, CrN, ZrN and PtIr coatings are used as protective coatings for these molds. Novel nano crystalline PVD Ti-Ni-N and Ti-Cu-N coatings and thin sol-gel ZrO
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coatings were developed and tested as new protective coatings for glass pressing molds. Optical molds for injection molding of plastic lenses are frequently coated with thick diamond machinable electroless nickel coatings since steel cannot be machined with diamond tools. These nickel coatings have several drawbacks such as residual porosity, limited hardness and temperature resistance. Therefore, thick sol-gel silica based coatings were developed and tested as an alternative for the electroless nickel coatings.