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  4. Development of high-performance extrusion barrels with innovative gradient coatings
 
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2015
Conference Paper
Titel

Development of high-performance extrusion barrels with innovative gradient coatings

Abstract
Barrels for polymer extruders have to sustain severe service conditions. In the inner volume of a barrel for polymer processing, high temperature, high pressure and corrosive media lead to mixed forms of abrasive, adhesive wear and corrosion. Moreover, during the extrusion process, the conditions vary along the barrel length from sections where mainly abrasion occurs, to sections where corrosion dominates. To extend service life, the barrels are usually coated with hardfacing alloys of thickness up to the millimetre scale by spin casting, PTA or laser cladding. In the present contribution, an overview is given about the activities carried out in the frame of the Debacoat project funded by the EU. Issues are mainly addressed toward the development of new hardfacing alloy compositions, on laser cladding of internal surfaces of the barrels by mini laser heads and on the deposition of WC reinforced Ni-Cr alloys by laser.
Author(s)
Lemke, Jannis Nicolas
Polytechnikum Mailand
Rovatti, Ludovica
Polytechnikum Mailand
Lecis, Nora Francesca
Polytechnikum Mailand
Zarini, Stefano
Polytechnikum Mailand
Previtali, Barbara
Polytechnikum Mailand
Vedani, Maurizio
Polytechnikum Mailand
Stejskal, Ondrej
Bernex Bimetallic Sro, Modrice
Kubisch, Frank
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Pfennig, Martin
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Brückner, Frank
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Nowotny, Steffen
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Leunda, Josu
IK4 - TEKNIKER Polo Tecnológico de Eibar, Gipuzkoa
Soriano, Carlos
IK4 - TEKNIKER Polo Tecnológico de Eibar, Gipuzkoa
Sanz, Carmen
IK4 - TEKNIKER Polo Tecnológico de Eibar, Gipuzkoa
Bouaifi, Belkacem
Neue Technologie Systemlösungen GmbH, Osterode am Harz
Schbieb, Don
Neue Technologie Systemlösungen GmbH, Osterode am Harz
Andrianopoli, Chiara
COGNE Acciai Speciali SpA, Cogne
Garmendia, X.
GNC Làser, Gipuzkoa
Hauptwerk
Heat treatment and surface engineering. CD-ROM
Project(s)
DEBACOAT
Funder
European Commission EC
Konferenz
European Conference on Heat Treatment 2015
International Federation for Heat Treatment and Surface Engineering (IFHTSE Congress) 2015
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Language
English
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Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Tags
  • gradient coating

  • hardfacing alloys

  • laser cladding

  • spin casting

  • wear

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