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A Study on Porosity in Micro-Selective Laser Sintering of Copper Powder


Affiliations
1 School of Laser Science and Engineering, Jadavpur University, Kolkata, India
2 Central Manufacturing Technology Institute, Bangalore, India
3 Production Engineering Department, Jadavpur University, Kolkata, India
     

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In Selective Laser Sintering metal powder particles are consolidated layer-by-layer through laser heating. In recent years, process has been improved that addressed the defects such as porosity, micro-cracks etc., resulting its wider applications in industries. However, there is a promising opportunity exists to use this process in micro manufacturing, which has not been exploited to a great extent. In this work, an attempt has been made to understand the porosity defects formed in micro-selective laser sintering (Micro-Sintering) of copper powder. Molecular Dynamics based simulation study performed for the Micro-Sintering of nano-scale powders has shown insight into the mechanism of neck growth formation and resulting porosity on their joining with adjacent particles. The other defects such as cracks formation, balling effects, presence of residual binders contributing to porosity and micro-cracks observed during experimental study on Micro-Sintering of 5μm copper powder has also been discussed.

Keywords

Selective Laser Sintering, Copper, Defects, Porosity, Molecular Dynamics Simulations.
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  • Chang, S; Li, L; Lu, L; Fuh, J Y H: Selective Laser Sintering of Porous Silica Enabled by Carbon Additive, 'Materials', 2017, 10 (11), 1313.

  • Duan, B; Wang, M: Selective laser sintering and its application in biomedical engineering, 'MRS bulletin', 2011, 36(12), 998-1005.

  • Kasperovich, G; Haubrich, J; Gussone, J; Requena, G: Correlation between porosity and processing parameters in TiAl6V4 produced by selective laser melting, Materials & Design, 2016, 105, 160-170.

  • Ko, SH; Pan, H; Grigoropoulos, CP; Luscombe, CK; Fréchet, JM; Poulikakos, D: All-inkjet-printed flexible electronics fabrication on a polymer substrate by lowtemperature high-resolution selective laser sintering of metal nanoparticles, 'Nanotechnology', 2007, 18(34), 345202.

  • Koo, B.-U; Yi, Y; Lee, M; Kim, B.-K: Effects of particle size and forming pressure on pore properties of Fe-Cr-Al porous metal by pressureless sintering, Metals and Materials International, 2017, 23(2), 336-340.

  • Paul, S; Nagahanumaiah, Mitra, S; Roy, D; Molecular Dynamics Simulation Study of Neck Growth in Micro-selective Laser Sintering of Copper Nanoparticles, Simulations for Design and Manufacturing, Dixit U., Kant R. (Eds), 2018, 259-292, Springer, Singapore.

  • Read, N; Wang, W; Essa, K; Attallah, MM: Selective laser melting of AlSi10Mg alloy: Process optimisation and mechanical properties development, 'Materials & Design', 2015, (1980-2015), 65, 417-424.

  • Regenfuss, P; Ebert, R; Exner, H; Laser micro sintering–a versatile instrument for the generation of microparts, 'Laser Technik Journal', 2007a, 4(1), 26-31.

  • Regenfuss, P; Streek, A; Hartwig, L; Klötzer, S; Brabant, T; Horn, M; Ebert, R; Exner, H; Principles of laser micro sintering, Rapid Prototyping Journal, 2007b, 13(4), 204-212.

  • Regenfuss, P; Streek, A; Hartwig, L; Klötzer, S; Brabant, T; Horn, M; Ullmann, F; Ebert, R; Exner, H: Material depending mechanisms in laser micro sintering, 'Proceedings of the 5th LANE', 2007c, 403-418, Erlangen, Germany.

  • Shaw, B and S. Dirven (2016). Investigation of porosity and mechanical properties of nylon SLS structures, Proceedings of 23rd International Conference on Mechatronics and Machine Vision in Practice (M2VIP 2016), 208213, IEEE, Nanjing, China.

  • Song, JL; Li, YT; Deng, QL; Hu, DJ: Rapid prototyping manufacturing of silica sand patterns based on selective laser sintering, Journal of Materials Processing Technology, 2007, 187, 614-618.

  • Wei, S: Bangchao, Y., Xuanhong, Z., Jianhua, M., Qifeng, P; Xingwei, W: Effect of Sintering Time on the Microstructure of Porous Tantalum, 'Rare Metal Materials and Engineering', 2015, 44 (2), 319-322.

  • Yan, W; Li, N; Li, Y; Liu, G; Han, B; Xu, J: Effect of particle size on microstructure and strength of porous spinel ceramics prepared by pore-forming in situ technique, Bulletin of Materials Science, 2011, 34 (5), 1109-1112.


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  • A Study on Porosity in Micro-Selective Laser Sintering of Copper Powder

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Authors

Srijan Paul
School of Laser Science and Engineering, Jadavpur University, Kolkata, India
Nagahanumaiah
Central Manufacturing Technology Institute, Bangalore, India
Souren Mitra
Production Engineering Department, Jadavpur University, Kolkata, India

Abstract


In Selective Laser Sintering metal powder particles are consolidated layer-by-layer through laser heating. In recent years, process has been improved that addressed the defects such as porosity, micro-cracks etc., resulting its wider applications in industries. However, there is a promising opportunity exists to use this process in micro manufacturing, which has not been exploited to a great extent. In this work, an attempt has been made to understand the porosity defects formed in micro-selective laser sintering (Micro-Sintering) of copper powder. Molecular Dynamics based simulation study performed for the Micro-Sintering of nano-scale powders has shown insight into the mechanism of neck growth formation and resulting porosity on their joining with adjacent particles. The other defects such as cracks formation, balling effects, presence of residual binders contributing to porosity and micro-cracks observed during experimental study on Micro-Sintering of 5μm copper powder has also been discussed.

Keywords


Selective Laser Sintering, Copper, Defects, Porosity, Molecular Dynamics Simulations.

References