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Surface Roughness and Grain Size Variation When 3D Printing Polyamide 11 Parts Using Selective Laser Sintering.

Riccardo Tonello^1,2, Knut Conradsen¹, David Bue Pedersen²

¹Department of Applied Mathematics and Computer Science, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.

|July 14, 2023

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This study explored how build setup, thin walls, and sample position affect surface roughness and grain size in additive manufacturing using selective laser sintering (SLS) with polyamide 11. Results show these factors significantly influence the final object

Area of Science:

Additive Manufacturing
Materials Science

Background:

Selective Laser Sintering (SLS) is a key additive manufacturing technology.
Optimizing powder deposition, laser parameters, and temperature is crucial for high-quality parts.
Newer SLS technologies utilize multiple laser sources for enhanced control.

Purpose of the Study:

To investigate the impact of specific manufacturing parameters on surface roughness and grain size.
To evaluate the performance of a novel SLS system with dual CO2 laser sources.
To analyze these effects on polyamide 11 (PA11), a sustainable bio-based polymer.

Main Methods:

Utilized a Taguchi experimental design for systematic parameter variation.
Employed Analysis of Variance (ANOVA) to determine the significance of factors.

Keywords:

PA11 SLS additive manufacturing surface roughness

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Manufactured curved objects using polyamide 11 on an advanced SLS platform.

Main Results:

Identified significant differences in surface roughness based on tested parameters.
Observed variations in grain size influenced by build setup, thin walls, and sample position.
Demonstrated that parameter optimization is critical for controlling PA11 part characteristics.

Conclusions:

Build setup, thin walls, and sample position are critical factors in SLS of PA11.
The novel SLS technology shows sensitivity to these parameters, impacting surface and microstructural properties.
Further research can leverage these findings for precise control over SLS-processed bio-based polymers.