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Annealing of 3D printed parts

Wijk, Bart, de (2022) Annealing of 3D printed parts. Master's Internship Report, Chemical Engineering.


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The effects of annealing on dimensional warping, mechanical properties and thermal resistance were evaluated for 3D-printed polylactic acid (PLA) and carbon-fiber-reinforced Polyethylene terephthalate (PET-CF). Various objects were printed using Fused Deposition Modeling (FDM) technology and tested for shrinkage, warping, Heat Deflection Temperature (HDT), flexural strength and modulus. Z-layer adhesion, characteristic for FDM and other 3D printing techniques, was also evaluated. PLA samples were annealed at 80 and 110 ◦C, PET-CF samples at 120, 170 and 220 ◦C. Lower annealing temperatures were associated with a higher flexural strength (18,5% for PET-CF), while higher annealing temperatures resulted in stiffer and more temperature resistant objects (modulus increase: 23,3%, HDT: 229 ◦C for PET-CF). Temperature resistance of PET-CF was more affected by annealing temperature than PLA. Shrinkage was limited across all annealing methods and materials (≤ 1%) and dimensional warping was likewise a minimal issue when annealing below 220 ◦C. As a drawback, annealing resulted in significantly decreased Z-layer adhesion in all cases (flexural strength between -13 and -32% parallel to printed layers).

Item Type: Thesis (Master's Internship Report)
Supervisor name: Xie, J. and Picchioni, F.
Degree programme: Chemical Engineering
Thesis type: Master's Internship Report
Language: English
Date Deposited: 28 Feb 2022 10:06
Last Modified: 28 Feb 2022 10:06

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