研究目的
Investigating the effects of short glass fibers on polyamide 12 concerning powder properties, process behavior, and part properties in selective laser sintering (SLS).
研究成果
The study concludes that short glass fibers significantly affect the powder and part properties in SLS, with a critical fiber content of 30 vol.-% identified for optimal mechanical properties. The fiber-matrix adhesion and the use of fibers with suitable dimensions are areas for future research to fully utilize the benefits of fiber reinforcement in SLS.
研究不足
The study highlights limitations such as the decrease in flowability and diffuse reflection with increasing fiber content, a narrower processing window due to changes in isothermal crystallization, and a critical limit of filler concentration beyond which tensile strength decreases.
1：Experimental Design and Method Selection
The study investigates the effects of short glass fibers on polyamide 12 in SLS, focusing on powder properties, process behavior, and part properties. The methodology includes particle size distribution measurement, SEM for particle shape characterization, powder packing and flowability tests, DRIFTS for optical behavior analysis, isothermal DSC for crystallization behavior, and mechanical testing.
2：Sample Selection and Data Sources
PA 2200 by EOS GmbH and glass fibers by WELA Handelsgesellschaft mbH were used. The particle size distribution was measured by Morphologi G3, Malvern.
3：List of Experimental Equipment and Materials
Morphologi G3 (Malvern) for particle size distribution, Ultra Plus SEM (Carl Zeiss), ADP device by Emmeram Karg Industrietechnik for bulk density, Nicolet 6700 FTIR with DiffusIR DRIFTS unit (PIKE Technologies) for optical behavior, isothermal DSC for crystallization behavior, tensile testing machine by Zwick Roell for mechanical properties.
4：Experimental Procedures and Operational Workflow
The composites were dry-blended and processed in a DTM Sinterstation 2000. The processing parameters were statistically distributed over the build job to eliminate position dependencies. Tensile bars were generated for mechanical testing.
5：Data Analysis Methods
The data analysis included the calculation of porosity, Hausner ratio for flowability, and mechanical properties according to DIN EN ISO 527.
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