Stability of FDTS monolayer coating on aluminum injection molding tools

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The injection molding industry often employs prototype molds
    and mold inserts from melt spun (rapid solidification processing
    [1,2]) aluminum, especially for applications in optics [3,4], photonics
    [5] and microfludics. Prototypes are also used for verification
    of mold filling. The use of aluminum tools has reduced lead time
    (days instead of weeks) and manufacturing cost (30% of conventional
    mold). Moreover, for aluminum, a surface roughness (RMS)
    below 5 nm can be obtained with diamond machining [3,4,6]. Conventional
    mold coatings add cost and complexity, and coatings with
    thicknesses of a few microns can obliterate small features. The
    nanoimprint lithography community extensively uses functional
    monolayer coatings on silicon/SiO2 lithographic stamps [7–11].
    This treatment dramatically reduces stiction, and improves yield
    and quality of replicated nanostructures. Here we report on a fluorinated
    trichloro-silane based coating deposited on aluminum or
    its alloys by molecular vapor deposition. We have tested the stability
    of this coating in challenging conditions of injection molding, an
    environment with high shear stress from the molten polymer, pressures
    up to 200 MPa, temperatures up to 250 ◦C, and rapid thermal
    cycling.
    Original languageEnglish
    JournalApplied Surface Science
    Volume259
    Pages (from-to)538– 541
    ISSN0169-4332
    Publication statusPublished - 2012

    Keywords

    • FDTS coating
    • Aluminum injection molding tools
    • XPS
    • Contact angle

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