Effect of Powder Bed Fusion Laser Sintering on Dimensional Accuracy and Tensile Properties of Reused Polyamide 11

Journal article


Gunputh, U., Williams, G., Pawlik, M., Lu, Y. and Wood, P. 2023. Effect of Powder Bed Fusion Laser Sintering on Dimensional Accuracy and Tensile Properties of Reused Polyamide 11. Polymers. https://doi.org/10.3390/polym15234602
AuthorsGunputh, U., Williams, G., Pawlik, M., Lu, Y. and Wood, P.
Abstract

Polyamide 11 (PA11) is a plant-based nylon made from castor beans. Powder bed fusion laser sintering (PBF-LS) is an additive manufacturing process used for PA11 which allows for the reuse of the unsintered powder. The unsintered powder is mixed with virgin powders at different refresh rates, a process which has been studied extensively for most semi-crystalline polyamides. However, there is lack of information on the effect of using 100% reused PA11 powder and the effect of the number of times it is reused on its own, during powder bed fusion laser sintering. This paper investigates the effect of reusing PA11 powder in PBF-LS and the effect of the number of times it is reused on the dimensional accuracy, density and thermal and tensile properties. From the 100% virgin powder to the third reuse of the powder, there is a decrease in powder wastage, crystallinity and tensile strength. These are associated with the polymerisation and cross-linking process of polymer chains, upon exposure to high temperatures. This results in a higher molecular weight and, hence, a higher density. From the fourth reuse to the tenth reuse, the opposite is observed, which is associated with an increase in high-viscosity unmolten particles, resulting in defects in the PBF-LS parts.

Keywordspowder bed fusion laser sintering ; polyamide 11; reuse; tensile properties
Year2023
JournalPolymers
PublisherMDPI
ISSN2073-4360
Digital Object Identifier (DOI)https://doi.org/10.3390/polym15234602
Web address (URL)https://www.mdpi.com/2073-4360/15/23/4602
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Output statusPublished
Publication dates
Online02 Dec 2023
Publication process dates
Accepted28 Nov 2023
Deposited07 Feb 2024
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