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Article

Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites

1
Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
2
Functional Materials and Nanotechnology Center of Excellence, Walailak University, Nakhon Si Thammarat 80160, Thailand
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Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, Bangkok 10400, Thailand
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Division of Physics, School of Science, Walailak University, Nakhon Si Thammarat 80160, Thailand
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Department of Physics, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand
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Center of Excellence in Smart Materials Research and Innovation, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok 10520, Thailand
*
Author to whom correspondence should be addressed.
Academic Editor: Daniel Munteanu
Appl. Sci. 2021, 11(5), 2067; https://doi.org/10.3390/app11052067
Received: 20 January 2021 / Revised: 12 February 2021 / Accepted: 22 February 2021 / Published: 26 February 2021
Process parameters leading to magnetic polymer composites, an essential ingredient in the additive manufacturing of rare-earth-free magnets, are investigated. The induction melting of manganese (Mn) and aluminum (Al), and subsequent annealing at 450, 500, or 550 °C for 20 min, gave rise to ferromagnetic τ–MnAl phase, as well as other phases. The nonmagnetic Al4C3 and oxide phases were then removed by the magnetic separation. Magnetic powders from the magnetic separation were incorporated in polylactic acid (PLA) matrix via a solution route. The remanent magnetization as high as 4.3 emu/g in the powder form was reduced to 2.3–2.6 emu/g in the composites. The reduction in coercivity was minimal, and the largest value of 814 Oe was obtained when the powder annealed at 450 °C was loaded in the composite. The phase composition and hence magnetic properties were even more sensitive to the carbon (C) doping. Interestingly, the addition of 3% C led to coercivity as high as 1445 Oe in MnAl–C powders without further annealing. The enhanced coercivity was attributed to the domain wall pinning by the AlMn3C phase, and magnetizations are likely increased by this phase. View Full-Text
Keywords: manganese; aluminum; carbon; magnetic polymer composite; rare-earth-free magnet manganese; aluminum; carbon; magnetic polymer composite; rare-earth-free magnet
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MDPI and ACS Style

Thongsamrit, W.; Charoensuk, T.; Saetang, P.; Jantaratana, P.; Ruttanapun, C.; Sirisathitkul, C. Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites. Appl. Sci. 2021, 11, 2067. https://doi.org/10.3390/app11052067

AMA Style

Thongsamrit W, Charoensuk T, Saetang P, Jantaratana P, Ruttanapun C, Sirisathitkul C. Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites. Applied Sciences. 2021; 11(5):2067. https://doi.org/10.3390/app11052067

Chicago/Turabian Style

Thongsamrit, Wannisa, Thanida Charoensuk, Panissa Saetang, Pongsakorn Jantaratana, Chesta Ruttanapun, and Chitnarong Sirisathitkul. 2021. "Effects of Carbon Doping and Annealing Temperature on Magnetic MnAl Powders and MnAl Polymeric Composites" Applied Sciences 11, no. 5: 2067. https://doi.org/10.3390/app11052067

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