Accelerated Non-Isothermal Powder Bed Fusion of Polypropylene Using Superposed Fractal Exposure Strategies

Schlicht, Samuel; Drummer, Dietmar

doi:10.1007/978-3-031-37671-9_1

Cited by 3 publications

References 25 publications

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Geometry-induced process and part characteristics in support-free powder bed fusion of polypropylene at room temperature

Schlicht,

Drummer

2024

Prog Addit Manuf

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Laser-based powder bed fusion (LPBF) of semi-crystalline polymers enables the support-free layer-wise manufacturing of geometrically diverse, complex components. In contrast to the established quasi-isothermal powder bed fusion of polymers at elevated temperatures, non-isothermal, cold processing strategies allow to significantly extend the range of applicable material systems. Relying on the superposition of discretized, fractal exposure strategies and the implicit mesoscopic compensation of crystallization shrinkage, the support-free LPBF of polypropylene at room temperature is demonstrated. The present paper displays the temporally and spatially discrete exposure of superposed fractal, space-filling curves that enable the support-free LPBF of polypropylene through combining the mesoscopic compensation of crystallization shrinkage and the laser-induced minimization of thermal shrinkage through the implementation of pre-exposure scans. The non-isothermal processing regime was observed to exhibit an intrinsic robustness towards the influence of processing parameters on emerging peak temperatures while showing a significant extent of accumulated heat within manufactured parts. Complementary mechanical characterizations showed an orientation-dependent influence of the applied energy density on emerging mechanical properties, correlated with geometry-dependent temporal process characteristics that implicitly influence the available coalescence time and the timespan available for the thermal homogenization.

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Geometry-induced process and part characteristics in support-free powder bed fusion of polypropylene at room temperature

Schlicht,

Drummer

2024

Prog Addit Manuf

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Layer-dependent temperature evolution and cooling kinetics in non-isothermal Powder Bed Fusion of polypropylene

Schlicht,

Drummer

2024

Procedia CIRP

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Vaterite-Based in Situ Surface Modification and Process-Dependent Biocompatibility of Laser Sintered Polypropylene

Schlicht,

Campbell,

Weber

et al. 2024

Preprint

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Accelerated Non-Isothermal Powder Bed Fusion of Polypropylene Using Superposed Fractal Exposure Strategies

Cited by 3 publications

References 25 publications

Geometry-induced process and part characteristics in support-free powder bed fusion of polypropylene at room temperature

Geometry-induced process and part characteristics in support-free powder bed fusion of polypropylene at room temperature

Layer-dependent temperature evolution and cooling kinetics in non-isothermal Powder Bed Fusion of polypropylene

Vaterite-Based in Situ Surface Modification and Process-Dependent Biocompatibility of Laser Sintered Polypropylene

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