Indirect Fabrication of Metals and Ceramics

Beaman, Joseph J.; Barlow, J. W.; Bourell, David L.; Crawford, Richard H.; Marcus, Harris L.; McAlea, Kevin P.

doi:10.1007/978-1-4615-6327-3_5

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…This method is adopted for powder metallurgical manufacturing by using the same thermoplastic filaments but filling them with ceramic, metal or glass particles prior to AM deposition [7][8][9][10]. This approach to additively shape ceramic and metal materials has been used since the 1990s and has experienced a significant increase in popularity in recent years [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Fused Filament Fabrication of NiTi Components and Hybridization with Laser Powder Bed Fusion for Filigree Structures

et al. 2021

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The present study introduces an approach to the powder metallurgical shaping of a pseudo-elastic nickel–titanium (NiTi 44 alloy) combining two different additive manufacturing (AM) processes, namely fused filament fabrication (FFF) and laser powder bed fusion (LPBF), by manufacturing filigree structures on top of sintered FFF parts. Both processes start with commercial gas atomized NiTi powder, which is fractionated into two classes. Using the fine fraction with particle sizes <15 µm, robust thermoplastic filaments based on a non-commercial binder system were produced and processed to different auxetic and non-auxetic geometries employing a commercial standard printer. FTIR analysis for thermal decomposition products was used to develop a debinding regime. After sintering, the phase transformation austenite/martensite was characterized by DSC in as sintered and annealed state. Precipitates resulting from residual impurities were detected by micrographs and XRD. They led to an increased transformation temperature. Adjusting the oxygen and carbon content in the alloy remains a challenging issue for powder metallurgical processed NiTi alloys. Filigree lattice structures were built onto the surfaces of the sintered FFF parts by LPBF using the coarser powder fraction (15–45 µm). A good material bond was formed, resulting in the first known NiTi hybrid, which introduces new production and design options for future applications.

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