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Development of high-performance extrusion barrels with innovative gradient coatings

: Lemke, Jannis Nicolas; Rovatti, Ludovica; Lecis, Nora Francesca; Zarini, Stefano; Previtali, Barbara; Vedani, Maurizio; Stejskal, Ondřej; Kubisch, Frank; Pfennig, Martin; Brückner, Frank; Nowotny, Steffen; Leunda, Josu; Soriano, Carlos; Sanz, Carmen; Bouaifi, Belkacem; Schbieb, Don; Andrianopoli, Chiara; Garmendia, X.

Associazione Italiana di Metallurgia -AIM-; International Federation for Heat Treatment and Surface Engineering -IFHTSE-:
Heat treatment and surface engineering. CD-ROM : From tradition to innovation. European Conference on Heat Treatment 2015 & 22nd IFHTSE congress, Venice (Italy), 20 - 22 May 2015
Milano: AIM, 2015
ISBN: 978-88-98990-03-0
Paper 124811
European Conference on Heat Treatment <2015, Venice>
International Federation for Heat Treatment and Surface Engineering (IFHTSE Congress) <22, 2015, Venice>
European Commission EC
Development of high-performance barrels with innovative gradient coatings
Conference Paper
Fraunhofer IWS ()
gradient coating; hardfacing alloys; laser cladding; spin casting; wear

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.