scholarly journals Fabrication Of Scaffolds From Ti6Al4V Powders Using The Computer Aided Laser Method

2015 ◽  
Vol 60 (2) ◽  
pp. 1065-1070 ◽  
Author(s):  
L.A. Dobrzański ◽  
A.D. Dobrzańska-Danikiewicz ◽  
P. Malara ◽  
T.G. Gaweł ◽  
L.B. Dobrzański ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
3D Model ◽  
Three Dimensional ◽  
Plaster Cast ◽  
Laser Melting ◽  
Laser Method ◽  
Porous Implant ◽  
Unit Cells ◽  
Dimensional Shape ◽  
3D Solid

AbstractThe aim of the research, the results of which are presented in the paper, is to fabricate, by Selective Laser Melting (SLM), a metallic scaffold with Ti6Al4V powder based on a virtual model corresponding to the actual loss of a patient’s craniofacial bone. A plaster cast was made for a patient with a palate recess, and the cast was then scanned with a 3D scanner to create a virtual 3D model of a palate recess, according to which a 3D model of a solid implant was created using specialist software. The virtual 3D solid implant model was converted into a 3D porous implant model after designing an individual shape of the unit cell conditioning the size and three-dimensional shape of the scaffold pores by multiplication of unit cells. The data concerning a virtual 3D porous implant model was transferred into a selective laser melting (SLM) device and a metallic scaffold was produced from Ti6Al4V powder with this machine, which was subjected to surface treatment by chemical etching. An object with certain initially adopted assumptions, i.e. shape and geometric dimensions, was finally achieved, which perfectly matches the patient bone recesses. The scaffold created was subjected to micro-and spectroscopic examinations.

Fabrication of three-dimensional connected W-Cu10Sn composites by selective laser melting

2020 ◽  
Vol 264 ◽  
pp. 127377 ◽  
Author(s):  
Zhenlu Zhou ◽  
Zhen Tan ◽  
Dingyong He ◽  
Zheng Zhou ◽  
Li Cui ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Laser Melting

scholarly journals Development of PLA Fibers as an Antimicrobial Agent with Enhanced Infection Resistance using Electrospinning/Plasma Technology

2020 ◽  
Author(s):  
Abdelrahman Mahmoud ◽  
Mohammed Naser ◽  
Mahmoud Abdelrasool ◽  
Khalid Jama ◽  
Mohamed Hussein ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Three Dimensional ◽  
Plasma Technology ◽  
Energy Increase ◽  
The Past ◽  
Unit Cells ◽  
Infection Resistance ◽  
Dimensional Shape ◽  
Fiber Dimensions ◽  
Three Dimensional Shape

Humans are vulnerable and easily prone to all kind of injuries, diseases, and traumas that can be damaging to their tissues (including its building unit, cells), bones, or even organs. Therefore, they would need assistance in healing or re-growing once again. Medical scaffolds have emerged over the past decades as one of the most important concepts in the tissue-engineering field as they enable and aide the re-growth of tissues and their successors. An optimal medical scaffold should be addressing the following factors: biocompatibility, biodegradability, mechanical properties, scaffold architecture/porosity, precise three-dimensional shape and manufacturing technology. There are several materials utilized in the fabrication of medical scaffolds, but one of the most extensively studied polymers is polylactic acid (PLA). PLA is biodegradable thermoplastic aliphatic polyester that is derived from naturally produced lactic acid. PLA is characterized with its excellent mechanical properties, biodegradability, promising eco-friendly, and excellent biocompatibility. PLA can be fabricated into nanofibers for medical scaffolds used through many techniques; electrospinning is one of the widely used methods for such fabrication. Electrospinning is a favorable technique because in the preparation of scaffolds, some parameters such as fiber dimensions, morphology, and porosity are easily controlled. A problem that is associated with medical scaffolds, such as inflammation and infection, was reported in many cases resulting in a degradation of tissues. Therefore, a surface modification was thought of as a needed solution which mostly focuses on an incorporation of extra functionalities responsible for the surface free energy increase (wettability). Therefore, plasma technique was a favorable solution for the surface treatment and modification. Plasma treatment enables the formation of free radicals. These radicals can be easily utilized for grafting process. Subsequently, ascorbic acid (ASA) could be incorporated as anti-inflammatory and anti-infection agent on the plasma pretreated surface of scaffolds.

Analytical Solution and Experimental Study of Effective Young's Modulus of Selective Laser Melting-Fabricated Lattice Structure With Triangular Unit Cells

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Jie Niu ◽  
Hui Leng Choo ◽  
Wei Sun ◽  
Sui Him Mok
Keyword(s):  
Analytical Solution ◽  
Young’S Modulus ◽  
Selective Laser Melting ◽  
Triangular Lattice ◽  
Young's Modulus ◽  
Numerical Results ◽  
Lattice Structures ◽  
Shape Parameters ◽  
Laser Melting ◽  
Unit Cells

Research on materials, design, processing, and manufacturability of parts produced by additive manufacturing (AM) has been investigated significantly in the past. However, limited research on tensile behavior of cellular lattice structures by AM was carried out. In this paper, effective tensile Young's modulus, E*, of triangular lattice structures was determined. Firstly, analytical solution was derived based on Euler–Bernoulli beam theory. Then, numerical results of E* were obtained by finite element analysis (FEA) for triangular lattice structures classified by three shape parameters. The effects of side length, L, beam thickness, t, and height, h, on E* were investigated individually. FEA results revealed that there is a relationship between E* and the relative density and shape parameters. Among them, t has the most significant effect on E*. Numerical results were also compared with the results from modified general function for cellular structures and modified formula for triangular honeycomb. The E* predicted by the proposed analytical solution shows the best agreement with the numerical results. Finally, tensile tests were carried out using AlSi10 Mg triangular lattice structures manufactured by selective laser melting (SLM) process. The experimental results show that both analytical and numerical solutions are able to predict E* with good accuracy. In the future, the proposed solution can be used to design lightweight structures with triangular unit cells.

scholarly journals Fracture of three-dimensional lattices manufactured by selective laser melting

2019 ◽  
Vol 180-181 ◽  
pp. 147-159 ◽  
Author(s):  
Huaiyuan Gu ◽  
Sheng Li ◽  
Martyn Pavier ◽  
Moataz M. Attallah ◽  
Charilaos Paraskevoulakos ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Laser Melting

scholarly journals Design approaches for additive manufactured components, with a focus on selective laser melting

2017 ◽  
Vol 50 (3) ◽  
pp. 279-282
Author(s):  
Erin Komi ◽  
Petteri Kokkonen
Keyword(s):  
Selective Laser Melting ◽  
3D Model ◽  
Layer By Layer ◽  
Model Data ◽  
Laser Melting ◽  
Component Design ◽  
Subtractive Manufacturing ◽  
Successful Design ◽  
Manufacturing Techniques ◽  
And Performance

Additive manufacturing (AM) of metal components is characterized by the joining of material particles or feedstock to make parts described by 3D model data in typically a layer by layer fashion [1]. These modern and constantly improving manufacturing techniques inherently allow far more geometric freedom than traditional “subtractive” manufacturing processes, and thus necessitate novel approaches to component design. Careful utilization of this geometric freedom can be translated into products characterized by improved functionality and performance, simplified assemblies, are customizable, and/or lightweight [2-5]. This paper provides a brief overview design approaches, manufacturing limitations, and available tools for successful design of additive manufactured components, with special attention paid to the selective laser melting (SLM) approach.

scholarly journals 3D Diatom–Designed and Selective Laser Melting (SLM) Manufactured Metallic Structures

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Izabela Zglobicka ◽  
Agnieszka Chmielewska ◽  
Emre Topal ◽  
Kristina Kutukova ◽  
Jürgen Gluch ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Model Systems ◽  
Self Similarity ◽  
Laser Melting ◽  
Metallic Structures ◽  
Perfect Model ◽  
X Ray Computed ◽  
Biomimetic Approach ◽  
First Time

AbstractDiatom frustules, with their diverse three-dimensional regular silica structures and nano- to micrometer dimensions, represent perfect model systems for biomimetic fabrication of materials and devices. The structure of a frustule of the diatom Didymosphenia geminata was nondestructively visualized using nano X-ray computed tomography (XCT) and transferred into a CAD file for the first time. Subsequently, this CAD file was used as the input for an engineered object, which was manufactured by applying an additive manufacturing technique (3D Selective Laser Melting, SLM) and using titanium powder. The self-similarity of the natural and the engineered objects was verified using nano and micro XCT. The biomimetic approach described in this paper is a proof-of-concept for future developments in the scaling-up of manufacturing based on special properties of microorganisms.

Synthesis of Porous Titanium with Directional Pores by Selective Laser Melting

2012 ◽  
Vol 6 (5) ◽  
pp. 597-603 ◽  
Author(s):  
Takayuki Nakamoto ◽  
◽  
Nobuhiko Shirakawa ◽  
Kyosuke Kishida ◽  
Katsushi Tanaka ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Practical Importance ◽  
Three Dimensional ◽  
High Strength ◽  
Longitudinal Direction ◽  
Porous Titanium ◽  
Thin Layers ◽  
Implant Fixation ◽  
Laser Melting ◽  
Low Modulus

There has been a growing interest and practical importance in producing implants such as artificial joints, bone fixators and spinal fixators with titanium. In order to achieve good bone/implant fixation while avoiding the problem of bone absorption, it is mandatory to reduce the Young’s modulus of titanium while keeping the high strength so as to achieve the compatibility in these mechanical properties with human cortical bone. We have tried to fabricate porous titanium with directional pores by the use of the method based on Selective Laser Melting (SLM), in which complex three-dimensional parts even containing designed shapes of pores can be produced by sintering successive thin layers of metal powder with a laser beam. Here we show that porous titanium with directional pores aligned in the longitudinal direction of the ingot is successfully produced through the use of the SLM process and that high strength and low modulus comparable to those of human bone are simultaneously achieved when these properties are measured in the longitudinal direction of the ingot.

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