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TiOx/Cr2O3 Heating Coatings for Injection Molding of Polyamide

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Enhanced Material, Parts Optimization and Process Intensification (EMPOrIA 2020)

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Abstract

Variotherm injection molding processes are used to increase the quality of molded parts. Currently, tempering systems exhibit low temperature gradients or require additional process steps. A heating system applied directly on the cavity surface of the mold tool combines two benefits: high temperature gradients without additional process steps. In this study, a heating coating made of TiOx/Cr2O3 was applied on the surface of a tooling steel to control the cavity temperature by Joule heating. The heating coating is electrically insulated from the substrate by an Al2O3 coating. Homogeneity of temperature distribution was investigated as well as thermal durability for processing polyamide in the temperature range from 70 °C to 220 °C. The coating system withstood 5,000 thermal cycles at high heating rates and without degradation.

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Acknowledgement

The presented investigations were carried out at RWTH Aachen University within the framework of the Collaborative Research Centre SFB1120-236616214 “Precision Melt Engineering” and funded by the Deutsche Forschungsgemeinschaft e.V. (DFG, German Research Foundation). The sponsorship and support is gratefully acknowledged.

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Authors and Affiliations

  1. RWTH Aachen University, Surface Engineering Institute (IOT), Kackertstr. 15, 52072, Aachen, Germany

    Kirsten Bobzin, Wolfgang Wietheger, Hendrik Heinemann & Andreas Schacht

Authors
  1. Kirsten Bobzin
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  2. Wolfgang Wietheger
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  3. Hendrik Heinemann
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  4. Andreas Schacht
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Corresponding author

Correspondence to Andreas Schacht .

Editor information

Editors and Affiliations

  1. Institut für Schweißtechnik und Fügetechnik, Aachen, Nordrhein-Westfalen, Germany

    Uwe Reisgen

  2. Lehrstuhl für Kunststofftechnik der Universität Erlangen-Nürnberg, Erlangen, Bayern, Germany

    Dietmar Drummer

  3. Mathematical Modeling and Analysis, Darmstadt, Hessen, Germany

    Holger Marschall

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Bobzin, K., Wietheger, W., Heinemann, H., Schacht, A. (2021). TiOx/Cr2O3 Heating Coatings for Injection Molding of Polyamide. In: Reisgen, U., Drummer, D., Marschall, H. (eds) Enhanced Material, Parts Optimization and Process Intensification. EMPOrIA 2020. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-70332-5_8

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  • DOI: https://doi.org/10.1007/978-3-030-70332-5_8

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-70331-8

  • Online ISBN: 978-3-030-70332-5

  • eBook Packages: EngineeringEngineering (R0)

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