Fabrication of Molded Interconnect Devices Using Metal Printing

2019 ◽  
Vol 43 (8) ◽  
pp. 583-589
Author(s):  
Nam-Hoon Chang ◽  
Jeonghee You ◽  
Keun Park
Keyword(s):  
Metal Printing ◽  
Molded Interconnect Devices

scholarly journals A Trial Acoustic Improvement in a Lecture Hall with MPP Sound Absorbers and FDTD Acoustic Simulations

2021 ◽  
Vol 11 (6) ◽  
pp. 2445
Author(s):  
Matteo Cingolani ◽  
Giulia Fratoni ◽  
Luca Barbaresi ◽  
Dario D’Orazio ◽  
Brian Hamilton ◽  
...  
Keyword(s):  
Double Layer ◽  
Speech Intelligibility ◽  
Single Layer ◽  
Lecture Hall ◽  
Full Spectrum ◽  
Metal Printing ◽  
Specific Impedance ◽  
Specific Material ◽  
Acoustic Treatment ◽  
Difference Time

Sound absorbing micro-perforated panels (MPPs) are being increasingly used because of their high quality in terms of hygiene, sustainability and durability. The present work investigates the feasibility and the performance of MPPs when used as an acoustic treatment in lecture rooms. With this purpose, three different micro-perforated steel specimens were first designed following existing predictive models and then physically manufactured through 3D additive metal printing. The specimens’ acoustic behavior was analyzed with experimental measurements in single-layer and double-layer configurations. Then, the investigation was focused on the application of double-layer MPPs to the ceiling of an existing university lecture hall to enhance speech intelligibility. Numerical simulations were carried out using a full-spectrum wave-based method: a finite-difference time-domain (FDTD) code was chosen to better handle time-dependent signals as the verbal communication. The present work proposes a workflow to explore the suitability of a specific material to speech requirements. The measured specific impedance complex values allowed to derive the input data referred to MPPs in FDTD simulations. The outcomes of the process show the influence of the acoustic treatment in terms of reverberation time (T30) and sound clarity (C50). A systematic comparison with a standard geometrical acoustic (GA) technique is reported as well.

Boiling Enhanced Lidded Server Packages for Two-Phase Immersion Cooling Using 3D Metal Printing and Metal Injection Molding Technologies

2021 ◽  
Author(s):  
Jimmy Chuang ◽  
Jin Yang ◽  
David Shia ◽  
Y L Li
Keyword(s):  
Injection Molding ◽  
High Performance ◽  
Heat Dissipation ◽  
Thermal Design ◽  
Metal Injection Molding ◽  
Electronic Packages ◽  
Two Phase ◽  
Immersion Cooling ◽  
Metal Printing ◽  
3D Metal Printing

Abstract In order to meet increasing performance demand from high-performance computing (HPC) and edge computing, thermal design power (TDP) of CPU and GPU needs to increase. This creates thermal challenge to corresponding electronic packages with respect to heat dissipation. In order to address this challenge, two-phase immersion cooling is gaining attention as its primary mode of heat of removal is via liquid-to-vapor phase change, which can occur at relatively low and constant temperatures. In this paper, integrated heat spreader (IHS) with boiling enhancement features is proposed. 3D metal printing and metal injection molding (MIM) are the two approaches used to manufacture the new IHS. The resultant IHS with enhancement features are used to build test vehicles (TV) by following standard electronic package assembly process. Experimental results demonstrated that boiling enhanced TVs improved two-phase immersion cooling capability by over 50% as compared to baseline TV without boiling enhanced features.

Meteorite as raw material for Direct Metal Printing: A proof of concept study

2018 ◽  
Vol 143 ◽  
pp. 76-81 ◽  
Author(s):  
Karel Lietaert ◽  
Lore Thijs ◽  
Bram Neirinck ◽  
Thomas Lapauw ◽  
Brian Morrison ◽  
...  
Keyword(s):  
Raw Material ◽  
Proof Of Concept ◽  
Concept Study ◽  
Metal Printing

scholarly journals Advanced Corrosion Protection of Additive Manufactured Light Metals by Creating Ceramic SurfaceThrough CERANOD® Plasma Electrolytical Oxidation Process

2021 ◽  
Vol 3 ◽  
Author(s):  
Patcharawee Jantimapornkij ◽  
Jörg Zerrer ◽  
Anna Buling
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Wear Behavior ◽  
Light Metal ◽  
Localized Corrosion ◽  
Full Potential ◽  
Oxide Ceramic ◽  
Light Metals ◽  
Metal Printing ◽  
Plasma Electrolytic

Lightweight structures produced by additive manufacturing (AM) technology such as the selective laser melting (SLM) process enable the fabrication of 3D structures with a high degree of freedom. A printed component can be tailored to have specific properties and render possible applications for industries such as the aerospace and automotive industries. Here, AlSi10Mg is one of the alloys that is currently used for SLM processes. Although the research with the aim improving the strength of AM aluminum alloy components is rapidly progressing, corrosion protection is scarcely addressed in this field. Plasma electrolytic oxidation (PEO) is an advanced electrolytical process for surface treatment of light metals such as aluminum, magnesium, and titanium. This process produces an oxide ceramic-like layer, which is extremely hard but also ductile, and significantly improves the corrosion and wear behavior. The aim of this study is to understand the corrosion behavior of 3D-printed AlSi10Mg alloy and to improve its corrosion resistance. For this reason, the properties of CERANOD®—PEO coating on an AlSi10Mg alloy produced by SLM were investigated on different AM surfaces, i.e., as-built, polished and stress relieved specimens. The corrosion performance of these surfaces was analyzed using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and long-term immersion tests. Moreover, the microstructure and morphology of the resulting coatings were characterized by SEM/EDS, taking into account the corrosive attacks. The results exhibited a high amount of localized corrosion in the case of the uncoated specimens, while the PEO process conducted on the aluminum AM surfaces led to enclosed homogeneous coatings by protecting the material’s pores, which are typically observed in AM process. Thereby, high corrosion protection could be achieved using PEO surfaces, suggesting that this technology is a promising candidate for unleashing the full potential of 3D light metal printing.

Process Monitoring of 3D Metal Printing in Industrial Scale

2018 ◽  
Author(s):  
Mohammadhossein Amini ◽  
Shing Chang
Keyword(s):  
3D Printing ◽  
Process Monitoring ◽  
Numerical Study ◽  
High Reliability ◽  
Factors Affecting ◽  
Main Metal ◽  
Metal Printing ◽  
Metal 3D Printing ◽  
Using Data

Metal 3D printing is one of the fastest growing additive manufacturing (AM) technologies in recent years. Despite the improvements and capabilities, reliable metal printing is still not well understood. One of the barriers of industrialization of metal AM is process monitoring and quality assurance of the printed product. These barriers are especially much highlighted in aerospace and medical device manufacturing industries where the high reliability and quality is needed. Selective Laser Melting (SLM) is one of the main metal 3D printing methods where it is known that more than 50 parameters are affecting the quality of the print. However, the current SLM printing process barely utilize a fraction of the collected data during production. Up to this point, no study to the best of our knowledge examines the correlation of factors affecting the quality of the print. After reviewing the current state of the art of process monitoring for metal AM involving SLM, we propose a method to control the process of the print in each layer and prevent the defects using data-driven techniques. A numerical study using simulated numbers is provided to demonstrate how the proposed method can be implemented.

Liquid Metal Printing

VDI-Z ◽  
2020 ◽  
Vol 162 (05-06) ◽  
pp. 55-57
Author(s):  
Johannes Glasschröder ◽  
Martin Otter ◽  
Benjamin Himmel ◽  
Oilver Leusch ◽  
Christian Miklec ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Metal Printing

Der industrielle Einsatz metallverarbeitender additiver Fertigungsverfahren nimmt in den letzten Jahren kontinuierlich zu. Ein breiter wirtschaftlicher Einsatz in der Mittel- und Großserienproduktion wird jedoch durch hohe Anlagen-, Fertigungs- und Materialkosten sowie durch eine fehlende Automatisierung gebremst. Die Firma Grob Werke entwickelt derzeit ein neues additives Fertigungsverfahren, das den aktuellen Herausforderungen entgegentritt und die wirtschaftliche Produktion von endkonturnahen Bauteilen möglich machen soll.

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