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Sol-gel coatings for high precision optical molds

: Mehner, A.; Zoch, H.-W.; Datchary, W.; Pongs, G.; Kunzmann, H.


CIRP Annals. Manufacturing Technology 55 (2006), No.1, pp.589-592
ISSN: 0007-8506
Journal Article
Fraunhofer IPT ()

The demand for high precision molds for the mass production of optical components is increasing. This paper describes a new approach for manufacturing precision optical molds. Firstly, thin ceramic sol-gel ZrO2-coatings were deposited onto pre-machined steel and nickel alloy molds. These coatings successfully solve the problem of sticking between the glass and the metal molds during high precision hot-pressing of glass lenses. Secondly, diamond machinable wear resistant sol-gel SiO2-xCy-coatings were deposited onto pre-machined steel molds for injection molding. Mechanical coating properties like hardness, elastic modulus and density were measured as a function of the sol-gel processing parameters.