Page 77 - MSAM-2-3

Materials Science in Additive Manufacturing Additive manufacturing of SiC composite

A B C

D E F

G H I

Figure 24. Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) scanning results of carbon fiber/silicon carbide (polylactic
acid) composite final product. (A–F) SEM scanning. (G–I) EDS scanning: (H) C element distribution and (I) Si element distribution.

a shorter ILD (a very short ILD affects the impregnation A
of the ceramic precursor), which enhances the proportion
of the reinforcing phase and reduces the porosity, on the
one hand, and introduces more pyrolyzed carbon, which
causes both positive and negative effects, on the other
hand. The combination of the two effects results in C /SiC
f
(PETG) composites with a shorter ILD that has an overall
performance inferior to that of C /SiC (PLA) composites
f
with a longer ILD. B C
Therefore, this study proposes to optimize the nozzle
aperture of the FFF additive equipment by replacing
0.8 mm aperture nozzle with 1.0 mm nozzle. Two sets of
complementary experiments of C /SiC (PETG) composites
f
utilized PETG-based prepreg with ILDs of 1.1 and 1.3 mm,
respectively. A comparison of the specimens formed
with 0.8 mm nozzle aperture and the supplementary
experimental specimens formed with 1.0 mm nozzle is
shown in Figure 25, where ILD-1.1 and ILD-1.3 are formed
with 1.0 mm nozzle, and ILD-1.0, ILD-1.2, and ILD-1.4 Figure 25. Photos of carbon fiber/polyethylene terephthalate glycol
are formed with 0.8 mm nozzle. It can be seen that the (C /PETG) green part samples. (A) Infill line distance (ILD)-1.0 to
f
specimens in Figure 25C were more densely filled than the ILD-1.4 from the left to right. (B) 0.8-C /PETG with an ILD of 1.2 mm.
f
(C) 1.0-C /PETG with an ILD of 1.0 mm.
specimen in Figure 25B, although a larger ILD was used. f
This is due to the increased nozzle aperture and thicker
filling line, which indirectly increased the filling density. 0.8 mm aperture nozzles is shown in Figure 26, where
the group using 0.8 mm aperture nozzles is referred to as
A comparison of the results of the three-point bending 0.8-C /SiC (PETG) and 0.8-C /SiC (PLA), and the group
f
f
and fracture toughness tests of the C /SiC (PETG) using a 1.0 mm nozzle aperture is referred to as 1.0-C /SiC
f
f
specimens obtained from this experimental preparation (PETG). The test results demonstrated that increasing the
and the C /SiC (PETG) and C /SiC (PLA) specimens using nozzle aperture diameter effectively improved the bending
f
f
Volume 2 Issue 3 (2023) 16 https://doi.org/10.36922/msam.1604