Process Routes Towards Novel Polybutylene Terephthalate – Polycarbonate Blend Powders for Selective Laser Sintering

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Schmidt, J.
Dechet, M.A.
Gómez Bonilla, J.S.
Bück, A.
Peukert, W.

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University of Texas at Austin


Additive manufacturing techniques, such as powder bed fusion (PBF) of polymers, often referred to as laser sintering (LS) or selective laser sintering (SLS), generate components directly from a CAD data set without using a specific mold. The range of materials commercially available for SLS merely includes some semi crystalline polymers, mainly polyamides. In this contribution two process chains to produce polybutylene terephthalate (PBT) – polycarbonate (PC) blend particles and the respective dependencies of product characteristics on process parameters are addressed. In the first recently proposed approach, blend powder systems are produced via co-comminution of PBT and PC in a planetary ball mill and subsequent thermal rounding of the obtained comminution product. This approach is compared to a route, where blend particles are obtained by agglomeration of comminution products of the respective polymers obtained by wet grinding and subsequent thermal rounding.


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