Go to the Indico Home Page Oldest event Older event Up to category Newer event Newest event
  • Indico style
  • Indico style - inline minutes
  • Indico style - numbered
  • Indico style - numbered + minutes
  • Indico Weeks View
    • Switch to the management area of this event
    Login

    EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

    13–17 Sept 2021 Virtual Conference
    Virtual
    Europe/Vienna timezone
    Thank you very much for your participation!

    Conference Secretary

    Modification of steel-polymer interfacial adhesion using Al2O3 and TiO2 surfaces produced via ALD

    14 Sept 2021, 12:50
    20m
    Room 10

    Room 10
    Oral Presentation C10. Coatings and surface modification technologies C10_Coatings and surface modification technologies

    Speaker

    Dr M.J. Lima (CFUM-UP, Centro de Física das Universidades do Minho e do Porto, University of Minho, Campus of Azurém)

    Description

    One of the main problems of the injection process is the demolding stage because polymers frequently remain adhered to the mold surface, producing defective polymeric parts and reducing the mold lifetime [1, 2].
    In the present work, alumina (Al2O3) and titanium dioxide (TiO2) thin films were deposited by atomic layer deposition (ALD) technique on steel substrates. The superficial chemical nature was modified by studying the effect of oxygen source (H2O and O3) in the ALD coating processes on two different steels (1.1730 and 1.2311). The TiO2 and Al2O3 modified steels were systematically characterized by SEM, EDS, AFM, XPS and OCA. Surface energy values were obtained to predict the demolding behavior of modified steel surfaces when applying different polymers. The lowest surface energy (SFE) was obtained using Al2O3 and H2O as oxygen source on the 1.2311 steel (1.2311-Al-H), representing a 30% decrease when comparing with the 1.2311 grinded steel. The difference in morphology, composition and thickness can be mainly attributed to the substrate and the oxygen source used. The simulation of polymer-mold interaction confirmed that 1.2311-Al-H sample has lower adherence to polycarbonate, when compared with 1.2311 grinded steel. The results suggest a potential application of ALD modified steels to be used as molds.

    References

    [1] M.V. Candal, et al., Journal of Materials Science, 43 (2008) 5052-5060.

    [2] I. Martínez-Mateo, et al., Wear, 271 (2011) 2512-2516.

    Speaker Country Portugal

    Author

    Dr M.J. Lima (CFUM-UP, Centro de Física das Universidades do Minho e do Porto, University of Minho, Campus of Azurém)

    Co-authors

    Prof. F. Oliveira (CICECO - Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal) Mr J. Castro (CFUM-UP, Centro de Física das Universidades do Minho e do Porto, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal) Mrs K. Gonzalez-Gala (CFUM-UP, Centro de Física das Universidades do Minho e do Porto, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal) Dr R. Silva (CICECO - Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal) Prof. S. Carvalho (SEG-CEMMPRE Mechanical Engineering Department, University of Coimbra, 3030-788 Coimbra, Portugal; CFUM-UP, Centro de Física das Universidades do Minho e do Porto, University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal)

    Presentation materials

    There are no materials yet.