Eco-friendly lightweight filament synthesis and mechanical characterization of additively manufactured closed cell foams
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Eco-friendly lightweight filament synthesis and mechanical characterization of additively manufactured closed cell foams
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| Creator |
Patil, Balu
Kumar, B R Bharath Bontha, Srikanth Balla, Vamsi Krishna Powar, Satvasheel Kumar, V Hemanth Suresha, S N Doddamani, Mrityunjay |
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| Subject |
Microstructure and Characterization
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| Description |
Environmentally pollutant fly ash cenospheres (hollow microballoons) are utilized with most widely consumed, relatively expensive high density polyethylene (HDPE) for developing lightweight eco-friendly filament for 3D printing of closed cell foams. Cenospheres (20, 40 and 60 by volume %) are blended with HDPE and subsequently extruded in filament to be used for 3D printing. Cenosphere/HDPE blends are studied for melt flow index (MFI) and Theological properties. MFI decreases with cenospheres addition. Complex viscosity, storage and loss modulus increase with filler loading. DSC results on the filament and printed samples reveal increasing crystallization temperature and decreasing crystallinity % with no appreciable change in peak melting temperature. Cooling rate variations exhibit crystallinity differences between the filament and the prints. CTE decreases with increasing cenosphere content resulting in lower thermal stresses and under diffusion of raster leading to non-warped prints. Micrography on freeze fractured filament and prints show cenospheres uniform distribution in HDPE. Intact cenospheres lower the foam density making it lightweight. Tensile tests are carried out on filaments and printed samples while flexural properties are investigated for 3D prints. Cenospheres addition resulted in improved tensile modulus and decreased filament strength. Tensile and flexural modulus of printed foams increases with filler content. Results are also compared with injection molded samples. Printed foams registered comparable tensile strength. Specific tensile modulus is noted to be increased with cenospheres loading implying weight saving potential of 3D printed foams. Property map reveals printed foams advantage over other fillers and HDPE composites synthesized through injection and compression molding.
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| Publisher |
Elsevier
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| Date |
2019-10
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/4746/1/balla.pdf
Patil, Balu and Kumar, B R Bharath and Bontha, Srikanth and Balla, Vamsi Krishna and Powar, Satvasheel and Kumar, V Hemanth and Suresha, S N and Doddamani, Mrityunjay (2019) Eco-friendly lightweight filament synthesis and mechanical characterization of additively manufactured closed cell foams. Composites Science and Technology, 183. Art No-107816. ISSN 0266-3538 |
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| Relation |
http://cgcri.csircentral.net/4746/
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