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Materials Science in Additive Manufacturing Additive manufacturing of SiC composite

A B C

D E F

G H I

J K L

M N O

P Q R

Figure 23. Scanning electron microscope (SEM) and energy dispersive spectroscopy scan results of carbon fiber/silicon carbide (PETG) composites. (A–C)
SEM of cut surface of infill line distance (ILD)-1.2 specimens. (D–F) SEM of cut surface of ILD-1.4 specimens. (G–I) SEM of the cross-section of ILD-
1.2 specimens. (J–L) SEM of the cross-section of ILD-1.2 specimens. (M–O) EDS results of ILD-1.2 specimens: (N) C element and (O) Si element. (P–R)
EDS results of ILD-1.4 specimens: (Q) C element and (R) Si element.

is about 1.0 mm, which is why the infill line distance of In the process of CVI-PIP preparation of C /SiC
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PETG-based green parts is set to ILD-1.0, which is not complexes, pyrolyzed carbon, as an interfacial layer
much different from the ILD of PLA-based billets, that is, between fibers/SiC, can protect carbon fibers, on the one
ILD-1.4, so the improvement effect is limited. However, hand, and reduce the fiber-substrate bond strength, on
according to the results, the reduction of the ILD to the other hand, facilitating the stress transfer between
1.0 mm did not enhance the bending strength of the substrate-interface-fibers and thus enhancing the
C /SiC composite, but instead reduced it to a value lower mechanical properties of C /SiC composites. However, the
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than that of the ILD-1.2 group, and the overall bending presence of excessive pyrolyzed carbon phase in the C /SiC
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strength of the C /SiC (PETG) composites was lower than composite also reduces the content of its main component,
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that of the C /SiC (PLA) composites. This explains the SiC matrix phase, which has a negative impact on the
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mechanism underlying the effect of pyrolyzed carbon on mechanical properties of the C /SiC composites. Therefore,
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the mechanical properties of C /SiC composites. replacing the resin matrix material with PETG introduces
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Volume 2 Issue 3 (2023) 15 https://doi.org/10.36922/msam.1604