Interplay between cellular activity and three‐dimensional scaffold‐cell constructs with different foam structure processed by electron beam melting

2014 ◽  
Vol 103 (5) ◽  
pp. 1677-1692 ◽  
Author(s):  
Krishna C. Nune ◽  
R. Devesh K. Misra ◽  
Sara M. Gaytan ◽  
Lawrence E. Murr
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Three Dimensional ◽  
Cellular Activity ◽  
Foam Structure

scholarly journals Electron beam melting in the fabrication of three-dimensional mesh titanium mandibular prosthesis scaffold

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Rongzeng Yan ◽  
Danmei Luo ◽  
Haitao Huang ◽  
Runxin Li ◽  
Niu Yu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Three Dimensional

scholarly journals Validation experiments for LBM simulations of electron beam melting

2014 ◽  
Vol 25 (12) ◽  
pp. 1441009 ◽  
Author(s):  
Regina Ammer ◽  
Ulrich Rüde ◽  
Matthias Markl ◽  
Vera Jüchter ◽  
Carolin Körner
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Three Dimensional ◽  
Numerical Data ◽  
Process Window ◽  
Line Energy ◽  
Good Surface ◽  
Experimental Process ◽  
Numerical Process ◽  
Best Parameter

This paper validates three-dimensional (3D) simulation results of electron beam melting (EBM) processes by comparing experimental and numerical data. The physical setup is presented which is discretized by a 3D thermal lattice Boltzmann method (LBM). An experimental process window is used for the validation depending on the line energy injected into the metal powder bed and the scan velocity of the electron beam. In the process window, the EBM products are classified into the categories, porous, good and swelling, depending on the quality of the surface. The same parameter sets are used to generate a numerical process window. A comparison of numerical and experimental process windows shows a good agreement. This validates the EBM model and justifies simulations for future improvements of the EBM processes. In particular, numerical simulations can be used to explain future process window scenarios and find the best parameter set for a good surface quality and dense products.

Hydrothermal Modification of Products Fabricated by Electron Beam Melting

2012 ◽  
Vol 529-530 ◽  
pp. 580-583
Author(s):  
Hidetsugu Fukuda ◽  
Masato Ueda ◽  
Masahiko Ikeda ◽  
Takayoshi Nakano
Keyword(s):  
Aqueous Solution ◽  
Electron Beam ◽  
Hydrothermal Treatment ◽  
Electron Beam Melting ◽  
Three Dimensional ◽  
Free Form ◽  
Hard Tissue ◽  
Hydrothermal Modification ◽  
Ceramic Films ◽  
Surface Modification Techniques

Electron beam melting (EBM) method is one of the free-form fabrication techniques that enable near-net-shape manufacturing of complex three-dimensional, porous, and graded products, and is expected to facilitate the development of new methods for manufacturing biomaterials that could be used for hard-tissue substitutes. Titanium and its alloys have been used widely as biomaterials for hard-tissue substitutes because of their excellent mechanical properties and biocompatibility. However, the osteointegration of these materials is less than that of bioactive ceramics. Therefore, various surface-modification techniques have been developed to improve the osteointegration. The simplest way is to synthesize bioactive ceramic films on the surface of titanium or its alloys. The purpose of the present work was to synthesize a bioactive TiO2 film on Ti-6Al-4V (hereafter, abbreviated as Ti-64) substrates fabricated from powders using the EBM method and treated by a combination of chemical and hydrothermal treatment. Ti-64 plates fabricated by the EBM method were chemically treated with a H2O2/HNO3 aqueous solution under appropriate conditions. The plates were then hydrothermally treated with a NH3 aqueous solution. TiO2-gel films were produced by chemical treatment with a H2O2/HNO3 aqueous solution on the surface of a Ti-64 substrate. Anatase-type TiO2 films with high crystallinity were synthesized by the hydrothermal treatment of the TiO2-gel films.

scholarly journals Comparative Analysis of the Oxygen Supply and Viability of Human Osteoblasts in Three-Dimensional Titanium Scaffolds Produced by Laser-Beam or Electron-Beam Melting

Materials ◽  
2013 ◽  
Vol 6 (11) ◽  
pp. 5398-5409 ◽  
Author(s):  
Anika Jonitz-Heincke ◽  
Jan Wieding ◽  
Christoph Schulze ◽  
Doris Hansmann ◽  
Rainer Bader
Keyword(s):  
Electron Beam ◽  
Comparative Analysis ◽  
Laser Beam ◽  
Electron Beam Melting ◽  
Oxygen Supply ◽  
Three Dimensional ◽  
Human Osteoblasts

scholarly journals Laser Finishing of Ti6Al4V Additive Manufactured Parts by Electron Beam Melting

2019 ◽  
Vol 10 (1) ◽  
pp. 183
Author(s):  
Silvio Genna ◽  
Gianluca Rubino
Keyword(s):  
Electron Beam ◽  
Electron Beam Melting ◽  
Continuous Wave ◽  
Laser Energy ◽  
Three Dimensional ◽  
Surface Finishing ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Reduced Surface

In this work, the feasibility of laser surface finishing of parts obtained by additive manufacturing (AM) was investigated. To this end, a 450 W fiber laser (operating in continuous wave, CW) was adopted to treat the surface of Ti-6Al-4V samples obtained via electron beam melting (EBM). During the tests, different laser energy densities and scanning speeds were used. In order to assess the quality of the treatment, either the as-built or the treated samples were analyzed by means of a three-dimensional (3D) profilometer, digital microscopy, and scanning electron microscopy. Analysis of variance (ANOVA) was performed to check which and how process parameters affected the finishing. The results show that, in the best conditions, the laser treatment reduced surface roughness by about 80%.

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