4.7 Article

Thermal and Oxidative Aging Effects of Polyamide-11 Powder Used in Multi-Jet Fusion

Journal

POLYMERS
Volume 15, Issue 10, Pages -

Publisher

MDPI
DOI: 10.3390/polym15102395

Keywords

polyamide-11; thermal aging; mechanical performance; powder aging; powder bed fusion; additive manufacturing

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The properties of both the polyamide-11 powder and the compression-moulded specimens derived from it were significantly affected within the first 24 hours of exposure to 180° Celsius, but consecutive exposure did not have a significant effect.
The transition of additive manufacturing (AM) from a technique for rapid prototyping to one for manufacturing of near net or net components has been led by the development of methods that can repeatedly fabricate quality parts. High-speed laser sintering and the recently developed multi-jet fusion (MJF) processes have seen quick adoption from industry due to their ability to produce high-quality components relatively quickly. However, the recommended refresh ratios of new powder led to notable amounts of used powder being discarded. In this research, polyamide-11 powder, typically used in AM, was thermally aged to investigate its properties at extreme levels of reuse. The powder was exposed to 180 ? in air for up to 168 h and its chemical, morphological, thermal, rheological, and mechanical properties were examined. To decouple the thermo-oxidative aging phenomena from AM process related effects, such as porosity, rheological and mechanical properties characterisation was performed on compression-moulded specimens. It was found that exposure notably affected the properties of both the powder and the derived compression-moulded specimens within the first 24 h of exposure; however, consecutive exposure did not have a significant effect.

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