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https://www.readbyqxmd.com/read/28886950/influence-of-thermo-mechanical-cycling-on-porcelain-bonding-to-cobalt-chromium-and-titanium-dental-alloys-fabricated-by-casting-milling-and-selective-laser-melting
#1
Maja Antanasova, Andraž Kocjan, Janez Kovač, Borut Žužek, Peter Jevnikar
PURPOSE: The aim has been to determine the effect of thermo-mechanical cycling on shear-bond-strength (SBS) of dental porcelain to Co-Cr and Ti-based alloys fabricated by casting, computer-numerical-controlled milling, and selective-laser-melting (SLM). METHODS: Seven groups (n=22/group) of metal cylinders were fabricated by casting (Co-Cr and commercially pure-cpTi), milling (Co-Cr, cpTi, Ti-6Al-4V) or by SLM (Co-Cr and Ti-6Al-4V) and abraded with airborne-particles...
September 5, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28874795/tailoring-the-thermal-conductivity-of-the-powder-bed-in-electron-beam-melting-ebm-additive-manufacturing
#2
C J Smith, S Tammas-Williams, E Hernandez-Nava, I Todd
Metallic powder bed additive manufacturing is capable of producing complex, functional parts by repeatedly depositing thin layers of powder particles atop of each other whilst selectively melting the corresponding part cross-section into each layer. A weakness with this approach arises when melting overhanging features, which have no prior melted material directly beneath them. This is due to the lower thermal conductivity of the powder relative to solid material, which as a result leads to an accumulation of heat and thus distortion...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28872620/electron-beam-welding-of-in792-ds-effects-of-pass-speed-and-pwht-on-microstructure-and-hardness
#3
Giuliano Angella, Giuseppe Barbieri, Riccardo Donnini, Roberto Montanari, Maria Richetta, Alessandra Varone
Electron Beam (EB) welding has been used to realize seams on 2 mm-thick plates of directionally solidified (DS) IN792 superalloy. The first part of this work evidenced the importance of pre-heating the workpiece to avoid the formation of long cracks in the seam. The comparison of different pre-heating temperatures (PHT) and pass speeds (v) allowed the identification of optimal process parameters, namely PHT = 300 °C and v = 2.5 m/min. The microstructural features of the melted zone (MZ); the heat affected zone (HAZ), and base material (BM) were investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), electron back-scattered diffraction (EBSD), X-ray diffraction (XRD), and micro-hardness tests...
September 5, 2017: Materials
https://www.readbyqxmd.com/read/28869368/3d-metal-printing-additive-manufacturing-technologies-for-frameworks-of-implant-borne-fixed-dental-prosthesis
#4
M R León, I M Klemm, J García-Arranz, M Özcan
An edentulous patient was rehabilitated with maxillary metal-ceramic and mandibular metal-resin implant-supported fixed dental prosthesis (FDP). Metal frameworks of the FDPs were fabricated using 3D additive manufacturing technologies utilizing selective laser melting (SLM) and electron beam melting (EBM) processes. Both SLM and EBM technologies were employed in combination with computer numerical control (CNC) post-machining at the implant interface. This report highlights the technical and clinical protocol for fabrication of FDPs using SLM and EBM additive technologies...
September 2017: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28819966/characterization-of-nanopipet-supported-ities-tips-for-scanning-electrochemical-microscopy-of-single-solid-state-nanopores
#5
Ran Chen, Ryan James Balla, Alex Lima, Shigeru Amemiya
Nanoscale scanning electrochemical microscopy (SECM) is a powerful scanning probe technique that enables high-resolution imaging of chemical processes at single nanometer-sized objects. However, it has been a challenging task to quantitatively understand nanoscale SECM images, which requires to accurately characterize the size and geometry of nanoelectrode tips. Herein, we address this challenge through transmission electron microscopy (TEM) of quartz nanopipets for SECM imaging of single solid-state nanopores by using nanopipet-supported interfaces between two immiscible electrolyte solutions (ITIES) as tips...
August 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28796180/formation-and-properties-of-laser-induced-periodic-surface-structures-on-different-glasses
#6
Stephan Gräf, Clemens Kunz, Frank A Müller
The formation and properties of laser-induced periodic surface structures (LIPSS) was investigated on different technically relevant glasses including fused silica, borosilicate glass, and soda-lime-silicate glass under irradiation of fs-laser pulses characterized by a pulse duration τ = 300 fs and a laser wavelength λ = 1025 nm. For this purpose, LIPSS were fabricated in an air environment at normal incidence with different laser peak fluence, pulse number, and repetition frequency. The generated structures were characterized by using optical microscopy, scanning electron microscopy, focused ion beam preparation and Fast-Fourier transformation...
August 10, 2017: Materials
https://www.readbyqxmd.com/read/28774095/an-investigation-of-sintering-parameters-on-titanium-powder-for-electron-beam-melting-processing-optimization
#7
Philipp Drescher, Mohamed Sarhan, Hermann Seitz
Selective electron beam melting (SEBM) is a relatively new additive manufacturing technology for metallic materials. Specific to this technology is the sintering of the metal powder prior to the melting process. The sintering process has disadvantages for post-processing. The post-processing of parts produced by SEBM typically involves the removal of semi-sintered powder through the use of a powder blasting system. Furthermore, the sintering of large areas before melting decreases productivity. Current investigations are aimed at improving the sintering process in order to achieve better productivity, geometric accuracy, and resolution...
December 1, 2016: Materials
https://www.readbyqxmd.com/read/28773031/additive-manufacturing-processes-selective-laser-melting-electron-beam-melting-and-binder-jetting-selection-guidelines
#8
REVIEW
Prashanth Konda Gokuldoss, Sri Kolla, Jürgen Eckert
Additive manufacturing (AM), also known as 3D printing or rapid prototyping, is gaining increasing attention due to its ability to produce parts with added functionality and increased complexities in geometrical design, on top of the fact that it is theoretically possible to produce any shape without limitations. However, most of the research on additive manufacturing techniques are focused on the development of materials/process parameters/products design with different additive manufacturing processes such as selective laser melting, electron beam melting, or binder jetting...
June 19, 2017: Materials
https://www.readbyqxmd.com/read/28772572/effect-of-energy-input-on-microstructure-and-mechanical-properties-of-titanium-aluminide-alloy-fabricated-by-the-additive-manufacturing-process-of-electron-beam-melting
#9
Ashfaq Mohammad, Abdulrahman M Alahmari, Muneer Khan Mohammed, Ravi Kottan Renganayagalu, Khaja Moiduddin
Titanium aluminides qualify adequately for advanced aero-engine applications in place of conventional nickel based superalloys. The combination of high temperature properties and lower density gives an edge to the titanium aluminide alloys. Nevertheless, challenges remain on how to process these essentially intermetallic alloys in to an actual product. Electron Beam Melting (EBM), an Additive Manufacturing Method, can build complex shaped solid parts from a given feedstock powder, thus overcoming the shortcomings of the conventional processing techniques such as machining and forging...
February 21, 2017: Materials
https://www.readbyqxmd.com/read/28752320/polymer-gel-dosimeters-with-pva-ga-matrix
#10
Seyed Mohammad Mahdi Abtahi, Hamid Sadeghi Abandansari
Properties of a new polymer gel with cross-linked polyvinyl alcohol as a gelatinous matrix were investigated. The new polymer gel dosimeter was named PVABAT. The irradiation was performed using a calibrated (60)Co beam. The dose responses of the PVABAT formulations were quantified with MRI transverse relaxation rate (R2) measurements. The results show that the PVABAT gel responds linearly to the absorbed dose for doses from 30 up to 45 Gy. The maximal amount of [Formula: see text] of PVABAT polymer gel dosimeter was about 0...
July 27, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28722396/novel-ceramic-grafted-separator-with-highly-thermal-stability-for-safe-lithium-ion-batteries
#11
Xiaoyu Jiang, Xiaoming Zhu, Xinping Ai, Hanxi Yang, Yuliang Cao
The separator is a critical component of lithium-ion batteries (LIBs), which not only allows ionic transport while it prevents electrical contact between electrodes but also plays a key role for thermal safety performance of LIBs. However, commercial separators for LIBs are typically microporous polyolefin membranes that pose challenges for battery safety, due to shrinking and melting at elevated temperature. Here, we demonstrate a strategy to improve the thermal stability and electrolyte affinity of polyethylene (PE) separators...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28630411/single-phase-3d-phononic-band-gap-material
#12
Franziska Warmuth, Maximilian Wormser, Carolin Körner
Phononic band gap materials are capable of prohibiting the propagation of mechanical waves in certain frequency ranges. Band gaps are produced by combining different phases with different properties within one material. In this paper, we present a novel cellular material consisting of only one phase with a phononic band gap. Different phases are modelled by lattice structure design based on eigenmode analysis. Test samples are built from a titanium alloy using selective electron beam melting. For the first time, the predicted phononic band gaps via FEM simulation are experimentally verified...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28613055/-comparison-of-adaptation-and-microstructure-of-titanium-upper-complete-denture-base-fabricated-by-selecting-laser-melting-and-electron-beam-melting
#13
COMPARATIVE STUDY
Y Ye, Y Y Xiong, J R Zhu, J Sun
Objective: To fabricate Ti alloy frameworks for a maxillary complete denture with three-dimensional printing (3DP) technique, such as selective laser melting (SLM) and electron beam melting (EBM), and to evaluate the microstructure of these frameworks and their adaptation to the die stone models. Methods: Thirty pairs of edentulous casts were divided into 3 groups randomly and equally. In each group, one of the three techniques (SLM, EBM, conventional technique) was used to fabricate Ti alloy frameworks. The base-cast sets were transversally sectioned into 3 sections at the distal of canines, mesial of first molars, and the posterior palatal zone...
June 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28494040/micro-to-macroroughness-of-additively-manufactured-titanium-implants-in-terms-of-coagulation-and-contact-activation
#14
Rebecca Klingvall Ek, Jaan Hong, Andreas Thor, Mikael Bäckström, Lars-Erik Rännar
PURPOSE: This study aimed to evaluate how as-built electron beam melting (EBM) surface properties affect the onset of blood coagulation. The properties of EBM-manufactured implant surfaces for placement have, until now, remained largely unexplored in literature. Implants with conventional designs and custom-made implants have been manufactured using EBM technology and later placed into the human body. Many of the conventional implants used today, such as dental implants, display modified surfaces to optimize bone ingrowth, whereas custom-made implants, by and large, have machined surfaces...
May 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28490947/preliminary-fabrication-and-characterization-of-electron-beam-melted-ti-6al-4v-customized-dental-implant
#15
Ravikumar Ramakrishnaiah, Abdulaziz Abdullah Al Kheraif, Ashfaq Mohammad, Darshan Devang Divakar, Sunil Babu Kotha, Sree Lalita Celur, Mohamed I Hashem, Pekka K Vallittu, Ihtesham Ur Rehman
The current study was aimed to fabricate customized root form dental implant using additive manufacturing technique for the replacement of missing teeth. The root form dental implant was designed using Geomagic™ and Magics™, the designed implant was directly manufactured by layering technique using ARCAM A2™ electron beam melting system by employing medical grade Ti-6Al-4V alloy powder. Furthermore, the fabricated implant was characterized in terms of certain clinically important parameters such as surface microstructure, surface topography, chemical purity and internal porosity...
May 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28482501/metallic-powder-bed-based-3d-printing-of-cellular-scaffolds-for-orthopaedic-implants-a-state-of-the-art-review-on-manufacturing-topological-design-mechanical-properties-and-biocompatibility
#16
REVIEW
X P Tan, Y J Tan, C S L Chow, S B Tor, W Y Yeong
Metallic cellular scaffold is one of the best choices for orthopaedic implants as a replacement of human body parts, which could improve life quality and increase longevity for the people needed. Unlike conventional methods of making cellular scaffolds, three-dimensional (3D) printing or additive manufacturing opens up new possibilities to fabricate those customisable intricate designs with highly interconnected pores. In the past decade, metallic powder-bed based 3D printing methods emerged and the techniques are becoming increasingly mature recently, where selective laser melting (SLM) and selective electron beam melting (SEBM) are the two representatives...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28409334/investigation-of-x-ray-focal-spot-alignment-using-a-jig-of-novel-design
#17
Lockie Yuen, Cameron McLucas
The X-ray focal spot and the centre of the flattening filter should be placed as close as possible to the central axis (CAX) on a linear accelerator (linac) to produce a radially symmetric beam. The aim of this study is to devise a method to easily optimise the focal spot position of Varian linac photon beams generated with a flattening filter. A simple and robust jig was designed and built to be inserted into the largest electron applicator. Accessory and jaw position interlocks were overridden to enable photon beam operation...
April 13, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28352885/enhanced-emission-of-encaged-oh-free-ca12-1-x-sr12xal14o33-0-1-gd-3-conductive-phosphors-via-tuning-the-encaged-electron-concentration-for-low-voltage-feds
#18
Meng Zhang, Yuxue Liu, Jian Yang, Hancheng Zhu, Duanting Yan, Xinyang Zhang, Chunguang Liu, Changshan Xu, Hong Zhang
Encaged-OH(-)-free Ca12(1-x)Sr12xAl14O33:0.1%Gd(3+) conductive phosphors were prepared through a melt-solidification process in combination with a subsequent heat treatment. Absorption spectra showed that the maximum encaged-electron concentration was increased to 1.08 × 10(21) cm(-3) through optimizing the doping amount of Sr(2+) (x = 0.005). Meanwhile, FTIR and Raman spectra indicated that pure Ca11.94Sr0.06Al14O33:0.1%Gd(3+) conductive phosphor without encaged OH(-) and C2(2-) anions was acquired. For the conductive powders heat-treated in air for different times, the encaged-electron concentrations were tuned from 1...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28259731/open-cellular-metal-implant-design-and-fabrication-for-biomechanical-compatibility-with-bone-using-electron-beam-melting
#19
L E Murr
Implant history extends more than 4000 years in antiquity, with biocompatible alloy implants extending over only 70 years. Over the past several decades, total hip and knee replacements of Ti-6Al-4V and Co-Cr-Mo alloys have exhibited post implantation life spans extending over 15 years; limited by infection, loosening, stress-shielding-related bone resorption and other mechanical failures. With the advent of additive manufacturing technologies, such as electron beam melting (EBM) over the past decade, personalized, patient-specific; porous (open-cellular) implant components can be manufactured, and the integration of chemical, biological and mechanical methods is able to optimize strategies for improving long-term clinical outcomes...
February 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28211998/nanojoint-formation-between-ceramic-titanate-nanowires-and-spot-melting-of-metal-nanowires-with-electron-beam
#20
Arixin Bo, Jose Alarco, Huaiyong Zhu, Eric R Waclawik, Haifei Zhan, YuanTong Gu
Construction of nanoarchitectures requires techniques like joint formation and trimming. For ceramic materials, however, it is extremely difficult to form nanojoints by conventional methods like merging. In this work, we demonstrate that ceramic titanate nanowires (NWs) can be joined by spot melting under electron beam (e-beam) irradiation (EBI). The irradiation fuses the contacted spot of titanate NWs yielding an intact nanojoint. Nanojoints with different morphologies can be produced. The joint structures consist of titanium dioxide (TiO2) rutile, anatase, and titanate phases in the direction away from the e-beam melting spot...
March 2, 2017: ACS Applied Materials & Interfaces
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