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Finally, coatings may also be applied on the surface to consolidate small surface features or to improve the surface quality of the part. Typical materials used for coatings are polyester or epoxy resin. [12] 3D concrete printing with binder jetting technologies has been demonstrated at large scale by Enrico Dini with D-Shape. [13]
A bicycle bridge has been constructed in TU Eindhoven by printing segments that are post-tensioned using high-strength cables running perpendicular to the printing direction. [ 20 ] [ 21 ] The post-tensioning technology has a lot of potential as a reinforcement strategy in additively manufactured concrete systems.
Epoxy resin is used widely in numerous formulations and forms in the aircraft-aerospace industry. It is regarded as "the work-horse of modern day composites". In recent years, the epoxy formulations used in composite prepregs have been fine-tuned to improve their toughness, impact strength and moisture absorption resistance.
By replacing traditional thermoset ink with CAN-based inks, complicated 3D geometries can still be printed that behave like traditional thermosets with excellent mechanical properties at service conditions, but can later also be recycled into new ink for the next round of 3D printing. One example involved the 3D printing of an epoxy ink which ...
Early construction 3D printing development and research have been under way since 1995. Two methods were invented, one by Joseph Pegna [9] which was focused on a sand/cement forming technique which utilized steam to selectively bond the material in layers or solid parts, though this technique was never demonstrated.
This technology was first developed at the Massachusetts Institute of Technology and patented in 1993. In 1996, the ExOne Company was granted an exclusive field-of-use patent for the technology, [2] while Z Corporation, which was later acquired by 3D Systems, [3] obtained a non-exclusive patent for use of the technology for metal casting purposes. [4]
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Substantial effort has been focused on 3D printing parameter optimization by many methods [15] including with the Taguchi methods to enable ASA to be used for high-end applications. [ 16 ] ASA with compounds of silver , rendering its surface antimicrobial by the silver's oligodynamic effect , was introduced to the market in 2008.
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