Printing and Laser Curing of Ag and Cu Paste - Prospects and Challenges in Additive Manufacturing

2021 ◽  
Vol 1161 ◽  
pp. 3-12
Author(s):  
Juliane Fichtner ◽  
Tobias Ulrich ◽  
Ines Dani ◽  
Philipp Dobeleit ◽  
Tobias Stoll ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Additive Manufacturing ◽  
Thermogravimetric Analysis ◽  
Design Of Experiment ◽  
Nir Spectroscopy ◽  
Computational Design ◽  
Regression Analyses ◽  
Point Measurement ◽  
Laser Curing ◽  
Printing Processes

This study depicts substantial characteristics of copper and silver pastes, dispensed and cured by oven processing. Different analyses, such as second electron microscopy (SEM), rheometry, thermogravimetric analysis (TGA), UV-VIS-NIR-spectroscopy and 4-point measurement were used. This work also will illustrate some results of computational design of experiment (DOE) and regression analyses for jet and mechanical printing processes.

Electrohydrodynamic Printing for Advanced Micro/Nanomanufacturing: Current Progresses, Opportunities, and Challenges

2018 ◽  
Vol 6 (4) ◽  
Author(s):  
Yiwei Han ◽  
Jingyan Dong
Keyword(s):  
Additive Manufacturing ◽  
High Resolution ◽  
Potential Application ◽  
Printed Electronics ◽  
Photonic Devices ◽  
Critical Factors ◽  
Biomedical Sensors ◽  
Electrohydrodynamic Printing ◽  
Nanoscale Fabrication ◽  
Printing Processes

The paper provides an overview of high-resolution electrohydrodynamic (EHD) printing processes for general applications in high-precision micro/nanoscale fabrication and manufacturing. Compared with other printing approaches, EHD printing offers many unique advantages and opportunities in the printing resolution, tunable printing modes, and wide material applicability, which has been successfully applied in numerous applications that include additive manufacturing, printed electronics, biomedical sensors and devices, and optical and photonic devices. In this review, the EHDs-based printing mechanism and the resulting printing modes are described, from which various EHD printing processes were developed. The material applicability and ink printability are discussed to establish the critical factors of the printable inks in EHD printing. A number of EHD printing processes and printing systems that are suitable for micro/nanomanufacturing applications are described in this paper. The recent progresses, opportunities, and challenges of EHD printing are reviewed for a range of potential application areas.

scholarly journals Suitability of Recycled PLA Filament Application in Fused Filament Fabrication Process

2021 ◽  
Vol 15 (4) ◽  
pp. 491-497
Author(s):  
Tomislav Breški ◽  
Lukas Hentschel ◽  
Damir Godec ◽  
Ivica Đuretek
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Polylactic Acid ◽  
Design Of Experiment ◽  
Experimental Approach ◽  
Manufacturing Processes ◽  
Support Structures ◽  
Fused Filament Fabrication ◽  
Layer Height ◽  
Printing Parameters

Fused filament fabrication (FFF) is currently one of the most popular additive manufacturing processes due to its simplicity and low running and material costs. Support structures, which are necessary for overhanging surfaces during production, in most cases need to be manually removed and as such, they become waste material. In this paper, experimental approach is utilised in order to assess suitability of recycling support structures into recycled filament for FFF process. Mechanical properties of standardized specimens made from recycled polylactic acid (PLA) filament as well as influence of layer height and infill density on those properties were investigated. Optimal printing parameters for recycled PLA filaments are determined with Design of Experiment methods (DOE).

scholarly journals Bone-inspired 3D printed structures for construction applications

2019 ◽  
Vol 14 (1) ◽  
pp. 111-124
Author(s):  
Roberto Naboni ◽  
Anja Kunic
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Computational Design ◽  
Bone Microstructure ◽  
Manufacturing Technology ◽  
Support Design ◽  
Efficient Construction ◽  
3D Printed ◽  
Viable Approach ◽  
Tectonic System

Overconsumption of resources is one of the greatest challenges of our century. The amount of material that is being extracted, harvested and consumed in the last decades is increasing tremendously. Building with new manufacturing technology, such as 3D Printing, is offering new perspectives in the way material is utilized sustainably within a construction. This paper describes a study on how to use Additive Manufacturing to support design logics inspired by the bone microstructure, in order to build materially efficient architecture. A process which entangles computational design methods, testing of 3D printed specimens, developments of prototypes is described. A cellular-based tectonic system with the capacity to vary and adapt to different loading conditions is presented as a viable approach to a material-efficient construction with Additive Manufacturing.

scholarly journals High-Resolution Electrohydrodynamic Printing of Silver Reactive Inks

MRS Advances ◽  
2016 ◽  
Vol 1 (34) ◽  
pp. 2409-2414 ◽  
Author(s):  
Christopher Lefky ◽  
Galen Arnold ◽  
Owen Hildreth
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Inkjet Printing ◽  
Solid Metal ◽  
Electrohydrodynamic Printing ◽  
Annealing Step ◽  
Scale Structures ◽  
Fine Resolution ◽  
Printing Processes ◽  
Continuous Material

ABSTRACTNano-inkjet printing using an Electrohydrodynamic's (EHD) pulsed cone-jet approach has the potential to bring affordable additive manufacturing to the micro and nanoscale. Ink technology is a major limitation of current EHD techniques. Specifically, most EHD printing processes print either nanoparticles or polymers. The materials are structurally weak and often have poor electrical or mechanical properties. For example, printing nanoparticles effectively creates a cluster of nanoparticles that must be sintered to create a continuous material. To address these issues, we have been adapting reactive inks to work with an EHD pulsed cone-jet. Specifically, we demonstrate that silver micron-scale structures can be printed using an EHD pulsed cone-jet regime. These inks produce solid structures without sintering steps and with good electrical properties.1,2 This work shows that reactive ink chemistries can be combined with EHD printing to produce fine-resolution features consisting of solid metal without an annealing step.

Characterization of Sintered Ti-6Al-4V Powders in Electron Beam Additive Manufacturing

2013 ◽  
Author(s):  
Xibing Gong ◽  
Kevin Chou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Beam ◽  
Additive Manufacturing ◽  
Side Surface ◽  
Martensitic Structure ◽  
Initial Work ◽  
Precursor Powders ◽  
Scanning Electron

In the powder-based electron beam additive manufacturing (EBAM) process, preheating is applied, prior to the melting stage, to aggregate precursor powders and to reduce the residual stresses in the build parts. Preheating results in sintering of the powders, which serve as the initial work material for the subsequent melting stage. In this study, sintered Ti-6Al-4V alloy powders from preheating were obtained and studied. The specimens of sintered powders, also processed to prepare metallographic samples, were observed and characterized by optical microscopy (OM) and scanning electron microscopy (SEM). The results show that after preheating, some powders are partially “melted” and necks between adjacent particles are formed with metallurgical bonds. The sintering evidence, necking, can be noted on both the build plane and the side surface (normal to the build plane). The Baktetwave α-β structure is identified in the powders, while the martensitic structure is formed in the solid EBAM part.

Preparation of carbon nanotubes/porous polyimide composites for effective adsorption of 2,4-dichlorophenol

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 95825-95835 ◽  
Author(s):  
Hui Yuan ◽  
Qing liang You ◽  
Lin Jie Song ◽  
Gui ying Liao ◽  
Hua Xia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Transmission Electron Microscopy ◽  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
Fourier Transform Infrared ◽  
Transmission Electron ◽  
Infrared Spectrometer ◽  
Polyimide Composites ◽  
Adsorption Desorption

The carbon nanotubes (CNT)/polyimide (PI) composites were prepared by blending and characterized by Fourier transform infrared spectrometer (FTIR), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and N2adsorption–desorption.

Synthesis of Triethynylborazine-Polyhydromethylsiloxane Copolymers and its Ceramization

2013 ◽  
Vol 774-776 ◽  
pp. 629-633
Author(s):  
Ji Feng Jiang ◽  
Kang Kang Guo ◽  
Ya Ping Zhu ◽  
Fan Wang ◽  
Hui Min Qi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
X Ray Diffraction ◽  
Hydrosilylation Reaction ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

Triethynylborazine-polyhydromethylsiloxane copolymers (TEB-PHMSs) were prepared through hydrosilylation reaction between -C≡CH attached to boron and ≡Si-H. The structures of TEB-PHMSs were characterized by Fourier transform Infrared (FT-IR) and Nuclear Magnetic Resonance (NMR) spectroscopy. Their cure behavior were examined by Differential Scanning Calorimeter (DSC) and FT-IR, and then thermostability and ceramization of cured TEB-PHMS were investigated by Thermogravimetric analysis (TGA), pyrolysis-GC-MS, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The results indicated that TEB-PHMSs could be cured and converted into an outstanding thermostable SiBCN ceramics.

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