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  • 1.
    Ashraf, Shakeel
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för elektronikkonstruktion.
    Mattsson, Claes
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för elektronikkonstruktion.
    Fondell, Mattis
    Helmholtz Zentrum, Inst Methods & Instrumentat Synchrotron Radiat Re, Berlin, Germany.
    Lindblad, Andreas
    Uppsala Univ, Dept Chem, Angstrom Lab, Uppsala, Sweden.
    Thungström, Göran
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för elektronikkonstruktion.
    Surface modification of SU-8 for metal/SU-8 adhesion using RF plasma treatment for application in thermopile detectors2015Ingår i: Materials Research Express, ISSN 2053-1591, Vol. 2, nr 8, artikel-id 086501Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This article reports on plasma treatment of SU-8 epoxy in order to enhance adhesive strength for metals. Its samples were fabricated on standard silicon wafers and treated with (O2 & Ar) RF plasma at a power of 25W at a low pressure of (3×10-3 torr) for different time spans (10 sec – 70 sec). The sample surfaces were characterized in terms of contact angle, surface (roughness and chemistry) and using a tape test. During the contact angle measurement, it was observed that the contact angle was reduced from 73° to 5° (almost wet) and 23° for (O2 & Ar) treated samples, respectively. The RMS surface roughness was significantly increased by 21.5% and 37.2% for (O2 & Ar) treatment, respectively. A pattern of metal squares was formed on the samples using photolithography for a tape test. An adhesive tape was applied to the samples and peeled off at 180o. The maximum adhesion results, more than 90%, were achieved for the O2-treated samples, whereas the Ar-treated samples showed no change. The XPS study shows the formation of new species in the O2-treated sample compared to the Ar-treated samples. The high adhesive results were due to the formation of hydrophilic groups and new O2 species in the O2-treated samples, which were absent in Ar-treated samples.

  • 2.
    Botero, Carlos Alberto
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Koptyug, Andrey
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Jiménez-Piqué, Emilio
    Universitat Politècnica de Catalunya, Barcelona, Spain.
    Rännar, Lars-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Microstructure and nanomechanical behavior of modified 316L-based materials fabricated using EBM2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    Stainless steel 316L based materials modified by the additions of iron-based wear-resistant alloys (Colferoloy@ 103 and 139) used for thermal spray coatings applications were fabricated by EBM. Process parameters were tailored to fabricate compact specimens of 1cm3 in an Arcam A2 (Arcam AB, Mölndal, Sweden) at Mid Sweden University. Microstructural features of the materials obtained were characterized by OM and SEM in polished and etched samples. Nanoindentation tests carried out at different penetration depths were performed on selected areas of the polished specimens to evaluate the materials micro/nano mechanical behavior and to establish correlations with the observed microstructure.

  • 3.
    Botero Vega, Carlos Alberto
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Jiménez-Piqué, Emilio
    Universitat Politècnica de Catalunya, Barcelona.
    Roos, Stefan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Skoglund, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Koptioug, Andrei
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Rännar, Lars-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Bäckström, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Nanoindentation: a suitable tool in metal Additive Manufacturing2018Konferensbidrag (Refereegranskat)
  • 4.
    Botero Vega, Carlos Alberto
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Ramsperger, Markus
    Arcam AB, Mölnlycke.
    Selte, Aydin
    Uddeholms AB, Hagfors.
    Åsvik, Kenneth
    Uddeholms AB, Hagfors.
    Koptioug, Andrei
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Skoglund, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Roos, Stefan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Rännar, Lars-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Bäckström, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Additive Manufacturing of a Cold-Work Tool Steel using Electron Beam Melting2019Ingår i: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, s. 1-6, artikel-id 1900448Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Metal additive manufacturing (AM) is on its way to industrialization. One of the most promising techniques within this field, electron beam melting (EBM), is nowadays used mostly for the fabrication of high‐performance Ti‐based alloy components for the aerospace and medical industry. Among the industrial applications envisioned for the future of EBM, the fabrication of high carbon steels for the tooling industry is of great interest. In this context, the process windows for dense and crack‐free specimens for a highly alloyed (Cr–Mo–V) cold‐work steel powder are presented in this article. High‐solidification rates during EBM processing lead to very fine and homogeneous microstructures. The influence of process parameters on the resulting microstructure and the chemical composition is investigated. In addition, preliminary results show very promising mechanical properties regarding the as‐built and heat‐treated microstructure of the obtained material.

  • 5.
    Koptioug, Andrei
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Bäckström, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Rännar, Lars-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    3D-printing: a future “magic wand” for global manufacturing. How can we benefit from it today for sports and health care?2017Ingår i: Proceedings of the 5th International Congress on Sport Sciences Research and Technology Support, icSPORTS / [ed] Jan Cabri, Pedro Pezarat Correia, INSTICC Press, 2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    3D-printing, or as it is also known, additive manufacturing (AM), is promising to be one of the determining manufacturing technologies of the present century. It is not a single technology but a family of rather different ones common in the way components are made, adding materials layer by layer. Additive manufacturing is already quite competitive to existing and well established technologies, but it also can provide unprecedented flexibility and complexity of shapes making components from the materials as different as cheese, chocolate and cream, live cells, concrete, polymers and metal. Many more materials we were not even thinking about few years ago are also becoming available in additive manufacturing, making it really believable that “only the sky is the limit”. During the time available for the keynote lecture, we will analyze the present position of AM in relation to other technologies, the features that make it so promising and its influence upon the part of our life we call sports and health, using the examples relevant to the Congress areas from computer systems to sports performance. Out of all enormities of materials available for different representatives of this manufacturing family we will concentrate at polymers and metals. AM technologies working with these two material families are already providing some unique solutions within the application areas relevant to the Congress' scope. We will also talk about some limitations inherent to the AM in polymers and metals to have the awareness that though the limit is somewhere “high in the sky”, it still exists.

  • 6.
    Laptev, Roman
    et al.
    Tomsk Polytechnic University.
    Pushilina, Natalia
    Tomsk Polytechnic University.
    Kashkarov, Egor
    Tomsk Polytechnic University.
    Syrtanov, Maxim
    Tomsk Polytechnic University.
    Stepanova, Ekaterina
    Tomsk Polytechnic University.
    Koptyug, Andrey
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik. Tomsk Polytechnic University.
    Lider, Andrey
    Tomsk Polytechnic University.
    Influence of beam current on microstructure of electron beam melted Ti-6Al-4V alloy2019Ingår i: Progress in Natural Science, ISSN 1002-0071, E-ISSN 1745-5391, Vol. 29, nr 4, s. 440-446Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The defect microstructure of the samples manufactured from Ti-6Al-4V powder was studied using electron beam melting (EBM) in the beam current range of 17 - 13 mA. The hybrid digital complex combined positron lifetime spectroscopy and coincidence Doppler broadening spectroscopy was used to characterize the defect structure of the materials. The microstructure and defects were also analyzed by transmission electron microscopy. It has been established that the main type of the defects in the EBM manufactured samples is dislocations. According to the conducted measurements and calculations, the dislocation density in the EBM manufactured samples exceeds by two orders the similar value for the cast Ti-6Al-4Valloy. Formation of Ti-Ti-Al nanoscale clusters has been found in the EBM manufactured samples.

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  • 7. Marianne, Klaman
    et al.
    Erik, Blohm
    Per-Åke, Johansson
    Jon, Lofthus
    Viviane, Alecrim
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Jonas, Örtegren
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Hybrid printing - print quality mechanisms when offset and inkjet are combined2011Ingår i: Advances in Printing and Media Technology, Vol. XXXVIII / [ed] IARIGAI, International Association of Research Organizations for the Information, Media and Graphic Arts Industrie (IARIGAI), 2011Konferensbidrag (Refereegranskat)
  • 8.
    Moxell, Mattias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Svällskiffer: Vad vet vi om svällskiffer och hur åtgärdas dess negativa påverkan på bästa sätt?2013Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
  • 9.
    Petrone, Nicola
    et al.
    University of Padova, Italy.
    Carraro, Giovanni
    University of Padova, Italy.
    Dal Castello, Stefano
    University of Padova, Italy.
    Broggio, Luca
    University of Padova, Italy.
    Koptioug, Andrei
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    Bäckström, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitets- och maskinteknik.
    A Novel Instrumented Human Head Surrogate For The Impact Evaluation Of Helmets2018Ingår i: Proceedings, Volume 2, ISEA 2018 / [ed] Dr Hugo Espinosa, David R. Rowlands, Jonathan Shepherd, Professor David Thiel, 2018, Vol. 2, s. 269-, artikel-id 6Konferensbidrag (Refereegranskat)
    Abstract [en]

    A novel Human Head Surrogate was obtained from available MRI scans of a 50th percentile male human head. Addictive manufacturing was used to produce the skull, the brain and the skin. All original MRI geometries were partially smoothed and adjusted to provide the best biofidelity compatible with printing and molding technology. The skull was 3D-printed in ABS and ten pressure sensors were placed into it. The brain surrogate was cast from silicon rubber in the 3d-printed plastic molds. Nine tri-axial accelerometers (placed at the tops of the lobes, at the sides of the lobes, in the cerebellum and in the center of mass) and a three-axis gyroscope (at the center of mass) were inserted into the silicon brain during casting. The cranium, after assembly with brain, was filled with silicon oil mimicking the cerebral fluid. Silicon rubber was cast in additional 3d-printed molds to form the skin surrounding the cranium. The skull base was adapted to be compatible with the Hybrid-III neck and allow the exit of brain sensors cabling. Preliminary experiments were carried out proving the functionality of the surrogate. Results showed how multiple accelerometers and pressure sensors allowed a better comprehension of the head complex motion during impacts.

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  • 10.
    Rännar, Lars-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    On Optimization of Injection Molding Cooling2008Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
  • 11.
    Rännar, Lars-Erik
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik. Mid Sweden University.
    Botero, Carlos
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Sjöström, William
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för kvalitets- och maskinteknik.
    Melin, Pelle
    Swerim.
    Strandh, Emil
    Swerim.
    Ledford, Chris
    North Carolina State University.
    Harrysson, Ola
    North Carolina State University.
    Surface topography development of Electron beam-melted materials - a historical review2019Ingår i: Proceedings Euromat 2019, Stockholm, 2019Konferensbidrag (Refereegranskat)
    Abstract [en]

    Introduction/Purpose Additive manufacturing in metal is developed rapidly, with regard to both equipment and materials. A recurring question from the industry in particular is how the development has been in a historical perspective and what one can expect from the future. This study aims to make a historical overview, from the early 2000s to today, of the surface roughness of materials manufactured using the powder bed fusion technology Electron Beam Melting (EBM). Methods Surfaces of specimens manufactured in tool steel (H13) and titanium alloys (Ti6Al4V) will be characterized using different methods such as focusvariation technology and scanning electron microscopy. Results The surface roughness is presented and shows the historical development of different materials, and different EBM-systems. Conclusions Being in the middle of a constantly evolving technology as AM in metal, it can be hard to predict future developments and this study shows there has been a great improvement in surface finishes from the early 2000s to the present. These results might add some information for discussions on future developments and directions concerning the area of surface smoothness and EBM.

  • 12.
    Xiong, Wenjuan
    et al.
    Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China.
    Jiang, Haojie
    Chinese Academy of Sciences, Beijing, China.
    Li, Tingting
    Chinese Academy of Sciences, Beijing, China.
    Zhang, Peng
    Chinese Academy of Sciences, Beijing, China.
    Xu, Qing
    Chinese Academy of Sciences, Beijing, China; University of Science and Technology of China, Hefei, People’s Republic of China.
    Zhao, Xuewei
    Chinese Academy of Sciences, Beijing, China; University of Science and Technology of China, Hefei, People’s Republic of China.
    Wang, Guilei
    Chinese Academy of Sciences, Beijing, China.
    Liu, Yaodong
    Chinese Academy of Sciences, Beijing, China.
    Luo, Ying
    Chinese Academy of Sciences, Beijing, China.
    Li, Zhihua
    Chinese Academy of Sciences, Beijing, China.
    Li, Junfeng
    Chinese Academy of Sciences, Beijing, China.
    Yu, Jinzhong
    Chinese Academy of Sciences, Beijing, China.
    Chao, Zhao
    Chinese Academy of Sciences, Beijing, China.
    Wang, Wenwu
    Chinese Academy of Sciences, Beijing, China.
    Radamson, Henry H.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för elektronikkonstruktion. Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, People’s Republic of China.
    SiNx films and membranes for photonic and MEMS applications2020Ingår i: Journal of materials science. Materials in electronics, ISSN 0957-4522, E-ISSN 1573-482X, Vol. 31, s. 90-97Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This work presents a novel process to form SiN x films and process for membranes with excellent mechanical properties for micro-electro-mechanical systems application as well as integration as IR waveguide for photonic application. The SiN x films were fabricated in SiNgen apparatus which is a single wafer chamber equipment compared to conventional low pressure chemical vapor deposition furnace process. The films showed low stress, good mechanical properties, but the synthesis also eradicates the issues of particle contamination. Through optimizing of the growth parameters and post annealing profile, low stress (40 Mpa) SiN x film could be finally deposited when annealing temperature rose up to 1150 °C. The stress relaxation is a result of more Si nano-crystalline which was formed during annealing, according to the FTIR results. The mechanical properties, Young’s modulus and hardness, were 210 Gpa and 20 Gpa respectively. For the waveguide application, a stack of three layers, SiO 2 /SiN x /SiO 2 was formed where the optimized layer thicknesses were used for minimum optical loss according to simulation feedback. After deposition of the first two layers in the stack, the samples were annealed in range of 900–1150 °C in order to release the stress. Chemical mechanical polish technique was applied to planarize the nitride layer prior to the oxide cladding layer. Such wafers can be used to bond to Si or Ge to manufacture advanced substrates.

  • 13.
    Öhlund, Thomas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Örtegren, Jonas
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Andersson, Henrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Nilsson, Hans-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Sintering Methods for Metal Nanoparticle Inks on Flexible Substrates2009Ingår i: NIP 25: DIGITAL FABRICATION 2009, TECHNICAL PROGRAM AND PROCEEDINGS, The Society for Imaging Science and Technology, 2009, s. 614-617Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper a number of selective sintering methods suitable for inkjet printed nanoparticles are demonstrated on two different coated papers. The selective methods demonstrated here are electric current heating, microwave sintering and photonic curing. As a reference, conventional heat chamber sintering is also included. Conductivity measurements and studies of sintered structures with optical and scanning electron microscopy are performed, as well as a qualitative evaluation of how the heat-sensitive substrates are affected. The purpose is to analyze characteristics of each method and gain insight in how different process parameters affect overall performance and reliability. With heat chamber sintering the best achievable conductivity without substrate deformation corresponded to less than 20% of pure silver. With some selective methods, conductivity reached well above 50% of pure silver.

     

     

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