Abstract
Selective laser sintering (SLS) of thermoplastic materials is an additive manufacturing process that overcomes the boundary between prototype construction and functional components. This technique also meets the requirements of traditional and established production processes. Crystallization behavior is one of the most critical properties during the cooling process and needs to be fully understood. Due to the huge influence of crystallization on the mechanical and thermal properties, it is important to investigate this process more closely. A commercial SLS polyamide (PA12) powder was measured with differential scanning calorimetry (DSC) to model a wider temperature range. To model isothermal crystallization between 160 and 168 °C, the Avrami model was used to determine the degree of crystallization. For non-isothermal crystallization between 0.2 and 20 K/min, different models were compared including the Ozawa, Jeziory, and Nakamura equations.
Highlights
Selective laser sintering (SLS) of polymers is established to produce prototypes and individualized parts
A series of differential scanning calorimetry (DSC) heating thermograms of polyamide 12 (PA12) samples are shown in Figure 2, which exhibit the melting peak mainly refers to thethe melting ofWith one crystal well shown that168 thetemperature, melting depends onheating the crystallization temperature
Applying crystallization kinetics in the SLS process is a new approach for process-adapted
Summary
Selective laser sintering (SLS) of polymers is established to produce prototypes and individualized parts. . First, the building platform is lowered to a layer thickness of about 100 μm and the pre-heated powder is applied into the building chamber with a roller or blade. The semi-crystalline thermoplastic powder is heated to a temperature just below the melting point. When the building chamber temperature is reached, depending on the given layer geometry, it connects to the individual layer below, and a CO2 laser, which is guided over the scanner mirror, selectively melts the preheated powder particles. The laser should only introduce the necessary amount of heat to melt a layer, to ensure the connection to the lower layer, and to minimize warpage during cooling
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