Laser-Induced Tar-Mediated Sintering of Metals and Refractory Carbides in Air
Name
acs-nano2020.pdf
Description
Accepted version
Size
1.24 MB
Format
Adobe PDF
Checksum (MD5)
b9f4a5d00d4ffd73b011b393b1d8e36a
Author(s)
Zang, Xining
Tai, Kiera Y
Jian, Cuiying
Shou, Wan
Matusik, Wojciech
Ferralis, Nicola
Grossman, Jeffrey C
Date Issued
2020
Journal
ACS Nano
Publisher
American Chemical Society (ACS)
Version
Author's final manuscript
Abstract
Refractory metals and their carbides possess extraordinary chemical and temperature resilience and exceptional mechanical strength. Yet, they are notoriously difficult to employ in additive manufacturing, due to the high temperatures needed for processing. State of the art approaches to manufacture these materials generally require either a high-energy laser or electron beam as well as ventilation to protect the metal powder from combustion. Here, we present a versatile manufacturing process that utilizes tar as both a light absorber and antioxidant binder to sinter thin films of aluminum, copper, nickel, molybdenum, and tungsten powder using a low power (<2W) CO2 laser in air. Films of sintered Al/Cu/Ni metals have sheet resistances of ∼10-1 ohm/sq, while laser-sintered Mo/W-tar thin films form carbide phases. Several devices are demonstrated, including laser-sintered porous copper with a stable response to large strain (3.0) after 150 cycles, and a laserprocessed Mo/MoC(1-x) filament that reaches T ∼1000 °C in open air at 12 V. These results show that tar-mediated laser sintering represents a possible low energy, cost-effective route for engineering refractory materials and one that can easily be extended to additive manufacturing processes.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Computer Science and Artificial Intelligence Laboratory
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1021/ACSNANO.0C04295
