Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering
Organically modified montmorillonite/polypropylene (OMMT/PP) composite powders for selective laser sintering (SLS) were developed using four powder preparation methods including melt extrusion combined with cryogenic grinding, thermally induced phase separation (TIPS), surface coating, and mechanica...
Saved in:
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/142901 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-142901 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1429012023-03-04T17:12:28Z Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering Tan, Lisa Jiaying Zhu, Wei Zhou, Kun School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Manufacturing Additive Manufacturing Selective Laser Sintering Organically modified montmorillonite/polypropylene (OMMT/PP) composite powders for selective laser sintering (SLS) were developed using four powder preparation methods including melt extrusion combined with cryogenic grinding, thermally induced phase separation (TIPS), surface coating, and mechanical mixing. Evaluations were conducted on the shape and size, powder-bed surface roughness, and thermal behavior of the developed composite powders as well as the mechanical properties of their injection-moulded tensile specimens. Melt extrusion proved to be the most favorable as the powders exhibited the highest thermo-oxidative stability (Td,max = 378 °C) and enhanced mechanical strength and ductility. TIPS could produce powders with reduced crystallization temperatures and increased melt enthalpies that were beneficial for SLS, and with powder morphology ideal for SLS without post-processing. It was found that at low loadings, nanofillers with sheet-like structures such as OMMT could limit the increase in crystallization temperatures of the composite powder, thus ensuring their wide sintering windows for SLS. Economic Development Board (EDB) Accepted version The work was supported by the Economic Development Board (EDB), Singapore and Robert Bosch (SEA) Pte Ltd. through the Industrial Postgraduate Program with School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore. 2020-07-07T07:27:22Z 2020-07-07T07:27:22Z 2020 Journal Article Tan, L. J., Zhu, W., & Zhou, K. (2020). Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering. Powder Technology, 369, 25-37. doi:10.1016/j.powtec.2020.05.005 0032-5910 https://hdl.handle.net/10356/142901 10.1016/j.powtec.2020.05.005 369 25 37 en Powder Technology © 2020 Elsevier B.V. All rights reserved. This paper was published in Powder Technology and is made available with permission of Elsevier B.V. application/pdf |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering::Manufacturing Additive Manufacturing Selective Laser Sintering |
spellingShingle |
Engineering::Manufacturing Additive Manufacturing Selective Laser Sintering Tan, Lisa Jiaying Zhu, Wei Zhou, Kun Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
description |
Organically modified montmorillonite/polypropylene (OMMT/PP) composite powders for selective laser sintering (SLS) were developed using four powder preparation methods including melt extrusion combined with cryogenic grinding, thermally induced phase separation (TIPS), surface coating, and mechanical mixing. Evaluations were conducted on the shape and size, powder-bed surface roughness, and thermal behavior of the developed composite powders as well as the mechanical properties of their injection-moulded tensile specimens. Melt extrusion proved to be the most favorable as the powders exhibited the highest thermo-oxidative stability (Td,max = 378 °C) and enhanced mechanical strength and ductility. TIPS could produce powders with reduced crystallization temperatures and increased melt enthalpies that were beneficial for SLS, and with powder morphology ideal for SLS without post-processing. It was found that at low loadings, nanofillers with sheet-like structures such as OMMT could limit the increase in crystallization temperatures of the composite powder, thus ensuring their wide sintering windows for SLS. |
author2 |
School of Mechanical and Aerospace Engineering |
author_facet |
School of Mechanical and Aerospace Engineering Tan, Lisa Jiaying Zhu, Wei Zhou, Kun |
format |
Article |
author |
Tan, Lisa Jiaying Zhu, Wei Zhou, Kun |
author_sort |
Tan, Lisa Jiaying |
title |
Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
title_short |
Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
title_full |
Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
title_fullStr |
Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
title_full_unstemmed |
Development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
title_sort |
development of organically modified montmorillonite/polypropylene composite powders for selective laser sintering |
publishDate |
2020 |
url |
https://hdl.handle.net/10356/142901 |
_version_ |
1759858331707506688 |