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      Ceramic Coatings via MOCVD in Injection Molding Tools to Influence Thermal and Demolding Properties∗ Translated title: Keramische MOCVD-Beschichtungen für den Einsatz in Spritzgießwerkzeugen zur Beeinflussung von thermischen und Entformungseigenschaften

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          Abstract

          Tool surfaces can be protected against corrosion and wear by thin film coatings. In addition to the protective properties, ceramic materials with low thermal conductivity, such as yttrium-stabilized zirconium oxide, can thermally insulate tool surfaces. In an injection molding process, the thermal insulation enables a more precise partial tempering and can thus be used to reduce surface defects on the plastic parts produced. Furthermore, the coating can have a positive effect on the demolding of the plastic parts. The coatings are applied in a hot wall reactor by metal organic chemical vapor deposition (MOCVD). This enables a homogeneous application of zirconium oxide based thin films on steel tools with complex 3D surfaces. The performance of the coatings was evaluated in various injection molding tests and assessed by the quality of the manufactured parts.

          Kurzfassung

          Werkzeugoberflächen können durch Dünnschichten vor Korrosion und Verschleiß geschützt werden. Zusätzlich zu den Schutzeigenschaften können keramische Materialien mit geringer Wärmeleitfähigkeit, wie z. B. Yttrium-stabilisiertes Zirkoniumoxid, Werkzeugoberflächen thermisch isolieren. Im Spritzguss ermöglicht die thermische Isolation eine präzisere partielle Temperierung und kann dadurch zur Reduktion von Oberflächenfehlern auf den hergestellten Kunststoffteilen genutzt werden. Des Weiteren kann die Beschichtung die Entformbarkeit der Kunststoffbauteile positiv beeinflussen. Die Beschichtungen werden in einem Heißwandreaktor durch metallorganische chemische Gasphasenabscheidung (MOCVD) aufgebracht. Dies ermöglicht die homogene Applikation von Zirkoniumoxid-basierten Dünnschichten auf Stahlwerkzeugen mit komplexen 3D-Oberflächen. Die Performance der Beschichtungen wurde in diversen Spritzgießversuchen evaluiert und anhand der hergestellten Bauteilqualität bewertet.

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          Most cited references 18

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          Ceramic Fuel Cells

           Nguyen Minh (1993)
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            Thermal barrier coatings for gas-turbine engine applications.

            Hundreds of different types of coatings are used to protect a variety of structural engineering materials from corrosion, wear, and erosion, and to provide lubrication and thermal insulation. Of all these, thermal barrier coatings (TBCs) have the most complex structure and must operate in the most demanding high-temperature environment of aircraft and industrial gas-turbine engines. TBCs, which comprise metal and ceramic multilayers, insulate turbine and combustor engine components from the hot gas stream, and improve the durability and energy efficiency of these engines. Improvements in TBCs will require a better understanding of the complex changes in their structure and properties that occur under operating conditions that lead to their failure. The structure, properties, and failure mechanisms of TBCs are herein reviewed, together with a discussion of current limitations and future opportunities.
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              Thermal barrier coating materials

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                Author and article information

                Journal
                htme
                HTM Journal of Heat Treatment and Materials
                Carl Hanser Verlag
                1867-2493
                2194-1831
                9 April 2020
                : 75
                : 2
                : 121-133
                Affiliations
                1 gemeinnützige KIMW Forschungs-GmbH, Lutherstraße 7, 58507 Lüdenscheid
                2 Kunststoff-Institut Lüdenscheid, Karolinenstraße 8, 58507 Lüdenscheid
                Author notes
                3 frettloeh@ 123456kunststoff-institut.de (corresponding author/Kontakt)
                [∗]

                Lecture held at the HeatTreatingCongress, HK, October 22–24, 2019 in Cologne, Germany

                Article
                HT110404
                10.3139/105.110404
                © 2020, Carl Hanser Verlag, München
                Page count
                References: 25, Pages: 13
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/htme
                Categories
                Scientific Contributions/Fachbeiträge

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