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  • 1.
    Björkman, Bo
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Eriksson, Johan
    Luleå tekniska universitet.
    Nedar, Lotta
    Luleå tekniska universitet.
    Samuelsson, Caisa
    Waste reduction through process optimization and development: overview1996In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 48, no 3, p. 45-49Article in journal (Refereed)
    Abstract [en]

    In this article, the possibilities of optimizing metallurgical processes based on minimization for waste reduction and application requirements for the reuse of waste products are discussed together with the possibilities of treating existing waste in direct connection with the process involved. Some results from ongoing projects on controlled dust generation and an outline of an ongoing research program are also described.

  • 2.
    Cai, Xiaoping
    et al.
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou .
    Liu, Yanan
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, .
    Wang, Xiaohong
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Jiao, Xinyang
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Feng, Peizhong
    School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
    Akhtar, Farid
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Fabrication of Highly Porous CuAl Intermetallic by Thermal Explosion Using NaCl Space Holder2018In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 70, no 10, p. 2173-2178Article in journal (Refereed)
    Abstract [en]

    A high-porosity CuAl-based intermetallic compound with composition Cu-50 at.% Al has been successfully prepared by thermal explosion (TE) using NaCl as space holder. The results showed that the NaCl particles were completely removed from the green compact by water leaching. The temperature of the specimen during the TE and the evolution of the porous microstructure were investigated. The TE was ignited at 560°C, and the specimen temperature increased to 775°C in 3 s, resulting in formation of intermetallic CuAl and CuAl2 phases in the final product. A porous CuAl-based intermetallic compound with up to 62 vol.% open porosity was produced when adding 60 vol.% NaCl. The compound exhibited a bimodal pore size structure, including large pores (200 μm to 300 μm) that replicated the NaCl particles and small pores (5 μm to 10 μm) interspersed in the pore walls. Moreover, the large pores were interconnected by channels and formed an open CuAl-based intermetallic cellular structure, having great potential for use in heat exchange and filtration applications.

  • 3.
    Hyvärinen, Olli
    et al.
    Outotec Research.
    Hämäläinen, Matti
    Outotec Research.
    Lamberg, Pertti
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Liipo, Jussi
    Outotec Research.
    Recovering gold from copper concentrate via the HydroCopper™ process2004In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 56, no 8, p. 57-59Article in journal (Refereed)
    Abstract [en]

    HydroCopperTM technology comprises a chloride-leaching method for copper sulfi de concentrates and copper production up to semi-products. As compared with the commonly used sulfate solutions, brine solutions offer aggressiveness and stability of the copper(I) ion and, consequently, a lower energy consumption in leaching. Copper(II) ions and oxygen are used as oxidants. Iron reports to the leaching residue as oxide and sulfur as elemental sulfur. Gold is dissolved and recovered in the third stage of the counter-current leaching when the redox potential reaches higher levels.

  • 4.
    Lindblom, B
    et al.
    Luleå tekniska universitet.
    Samuelsson, Caisa
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Sandström, Åke
    Ye, Guozhu
    Swerea MEFOS AB.
    Fine-particle characterization an important recycling tool2002In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 54, no 12, p. 35-38Article in journal (Refereed)
    Abstract [en]

    This paper summarizes the results from different research projects on fine-particle characterization of metallurgical residues, such as hydroxide sludge, electric-arc, furnace dust, and copper-converter dust. These studies demonstrated that characterization is essential for developing new recycling strategies. The basic knowledge of the chemical and physical properties of the residues obtained by the characterizations also provides necessary information on potential problems that could be encountered during the processing of such materials.

  • 5.
    Lindwall, Johan
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Malmelöv, Andreas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lundbäck, Andreas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Efficiency and Accuracy in Thermal Simulation of Powder Bed Fusion of Bulk Metallic Glass2018In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 70, no 8, p. 1598-1603Article in journal (Refereed)
    Abstract [en]

    Additive manufacturing by powder bed fusion processes can be utilized to create bulk metallic glass as the process yields considerably high cooling rates. However, there is a risk that reheated material set in layers may become devitrified, i.e., crystallize. Therefore, it is advantageous to simulate the process to fully comprehend it and design it to avoid the aforementioned risk. However, a detailed simulation is computationally demanding. It is necessary to increase the computational speed while maintaining accuracy of the computed temperature field in critical regions. The current study evaluates a few approaches based on temporal reduction to achieve this. It is found that the evaluated approaches save a lot of time and accurately predict the temperature history.

  • 6.
    Seidel, André
    et al.
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Saha, Shuvra
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Maiwald, Tim
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany;Technische Universität Dresden, Dresden, Germany.
    Moritz, Juliane
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Polenz, Stefan
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Marquardt, Axel
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany;Technische Universität Dresden, Dresden, Germany.
    Kaspar, Joerg
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Finaske, Thomas
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Lopez, Elena
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Brueckner, Frank
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany.
    Leyens, Christoph
    Fraunhofer-Institute for Material and Beam Technology, Dresden, Germany;Technische Universität Dresden, Dresden, Germany.
    Intrinsic Heat Treatment Within Additive Manufacturing of Gamma Titanium Aluminide Space Hardware2019In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 71, no 4, p. 1513-1519Article in journal (Refereed)
    Abstract [en]

    A major part of laser additive manufacturing focuses on the fabrication of metallic parts for applications in the space and aerospace sectors. Especially, the processing of the very brittle titanium aluminides can be particularly challenging because of their distinct tendency to lamellar interface cracking. In the present paper, a gamma titanium aluminide (γ-TiAl) nozzle, manufactured via electron beam melting, is extended and adapted via hybrid laser metal deposition. The presented example considers a new field of application for this class of materials and approaches the process-specific manipulation of the composition and/or microstructure via the adjustment of processing temperatures, temperature gradients and solidification conditions. Furthermore, intrinsic heat treatment is investigated for electron beam melting and laser metal deposition with powder, and the resulting influence is releated to conventional processing.

  • 7.
    Warnes, William H.
    et al.
    School of Mechanical, Industrial, & Manufacturing Engineering, Oregon State University.
    Kruzic, Jamie J.
    School of Mechanical, Industrial, & Manufacturing Engineering, Oregon State University.
    Pratt, Clara C.
    School of Social and Behavioral Health Sciences, Oregon State University.
    Stehr, Christian
    School of Mechanical, Industrial, & Manufacturing Engineering, Oregon State University.
    Cann, David P.
    School of Mechanical, Industrial, & Manufacturing Engineering, Oregon State University.
    Gibbons, Brady J.
    School of Mechanical, Industrial, & Manufacturing Engineering, Oregon State University.
    Gallino, Isabella
    Department of Materials Science and Engineering, Saarland University, Saarbrücken.
    Soldera, Flavio Andrés
    Department of Materials Science and Engineering, Saarland University, Saarbrücken.
    Busch, Ralf
    Department of Materials Science and Engineering, Saarland University, Saarbrücken.
    Wallström, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Improving participation of engineering students studying abroad: an international dual-degree program in materials science and mechanical engineering2013In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 65, no 7, p. 840-845Article in journal (Refereed)
1 - 7 of 7
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