Optimizing directed energy deposition of polymers through melt pool temperature control

  • The method of Directed Energy Deposition of polymers (DED-LB/P) was extended to allow control over the melt pool temperature using a pyrometer. DED-LB/P was used to build test specimen of polyamide 12 (PA12), orthogonal and parallel to the long side. Samples prepared under temperature control show superior mechanical properties over those generated without. The temperature of the melt pool allows to tune the quality of the built part. A too low temperature leads to a porous part on account of insufficient powder fusion, and a too high temperature leads to holes by formation of volatiles. The mechanical properties can be related to the porosity, the molecular mass of PA12 did not change substantially, the distribution width however increased with temperature. The best processing conditions were at 220 °C leading to a build part with a porosity of 0.6%, a Youngs modulus of 550 MPa and a fracture-strain of 15% with an ultimate strength of almost 28 MPa.

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Metadaten
Author:Yunus KutluORCiDGND, Adrian VagharORCiDGND, Marvin SchuleitORCiDGND, Magnus ThieleORCiDGND, Cemal EsenORCiDGND, Gerrit A. LuinstraORCiDGND, Andreas OstendorfORCiDGND
URN:urn:nbn:de:hbz:294-113497
DOI:https://doi.org/10.1007/s40964-024-00588-y
Parent Title (English):Progress in additive manufacturing
Subtitle (English):impact on physical properties of polyamide 12 parts
Publisher:Springer International Publishing
Place of publication:Cham
Document Type:Article
Language:English
Date of Publication (online):2024/11/04
Date of first Publication:2024/04/04
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:Additive manufacturing; DED-LB; Mechanical properties; Polymers; Size-exclusion chromatography; Temperature control
Volume:9
First Page:2403
Last Page:2412
Note:
Dieser Beitrag ist auf Grund des DEAL-Springer-Vertrages frei zugänglich.
Institutes/Facilities:Lehrstuhl für Laseranwendungstechnik
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften, Maschinenbau
open_access (DINI-Set):open_access
faculties:Fakultät für Maschinenbau
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International

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