scholarly journals Corrosion Testing of Additively Manufactured Metals and Biomedical Devices

2018 ◽  
Vol 1 (2) ◽  
pp. 81-84
Author(s):  
Dávid Miklós Kemény ◽  
Dóra Károly
Keyword(s):  
Additive Manufacturing ◽  
Human Life ◽  
New Technology ◽  
Chromium Alloy ◽  
Direct Metal Laser Sintering ◽  
Cobalt Chromium ◽  
Corrosion Properties ◽  
3D Printed ◽  
Biomedical Industry ◽  
Short Time

Abstract Additive manufacturing (AM) is becoming increasingly important, making it possible to produce a product in a short time, to specific individual requirements, and even in the presence of the customer. This research is related to direct metal laser sintering of additive manufacturing. This new technology is increasingly being used in more sectors, for example in biomedical industry, where a damaged product can potentially endanger human life. Corrosion tests were carried out during our research. Cyclic voltammetry curves and corrosion rates were determined with a potentiostat. Two typical biocompatible implant materials were compared, a cobalt chromium alloy (powder metallurgy) and a titanium alloy (3D printed). The results will help in specifying the corrosion properties of additively manufactured materials.

scholarly journals A design of experiment approach to 3D-printed mouthpieces sound analysis

2021 ◽  
Author(s):  
Antonio Bacciaglia ◽  
Alessandro Ceruti ◽  
Alfredo Liverani
Keyword(s):  
Additive Manufacturing ◽  
Design Of Experiment ◽  
Musical Instruments ◽  
Rapid Expansion ◽  
Fused Deposition Modelling ◽  
Layer By Layer ◽  
Fused Deposition ◽  
3D Printed ◽  
Processing Techniques ◽  
Short Time

AbstractNowadays additive manufacturing is affected by a rapid expansion of possible applications. It is defined as a set of technologies that allow the production of components from 3D digital models in a short time by adding material layer by layer. It shows enormous potential to support wind musical instruments manufacturing because the design of complex shapes could produce unexplored and unconventional sounds, together with external customization capabilities. The change in the production process, material and shape could affect the resulting sound. This work aims to compare the music performances of 3D-printed trombone mouthpieces using both Fused Deposition Modelling and Stereolithography techniques, compared to the commercial brass one. The quantitative comparison is made applying a Design of Experiment methodology, to detect the main additive manufacturing parameters that affect the sound quality. Digital audio processing techniques, such as spectral analysis, cross-correlation and psychoacoustic analysis in terms of loudness, roughness and fluctuation strength have been applied to evaluate sounds. The methodology herein applied could be used as a standard for future studies on additively manufactured musical instruments.

scholarly journals The computer-aided design and rapid prototyping fabrication of removable partial denture framework for occlusal rehabilitation: clinical report

2020 ◽  
Vol 9 (12) ◽  
pp. e9891210692
Author(s):  
Adriana da Fonte Porto Carreiro ◽  
Ana Larisse Carneiro Pereira ◽  
Camila Oliveira Paz ◽  
Rachel Gomes Cardoso ◽  
Clebya Rosália Pereira Medeiros ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
Computer Aided Design ◽  
Clinical Investigation ◽  
Clinical Report ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Intraoral Scanning ◽  
Computer Aided ◽  
3D Printed ◽  
Aided Design

The objective of this case report was to describe the clinical sequence for occlusal vertical dimension (OVD) recovering with the manufacture of removable partial dentures (RPD) produced by computer-aided design and rapid prototyping. The patient presented to the Dentistry Department of the Federal University of Rio Grande do Norte reporting dissatisfaction with the superior RPD. At clinical investigation, a fracture in the minor connector and support at the region of tooth 15 was observed, in addition to severe OVD loss. In this case, after obtaining correct OVD, four more sessions were necessary for RPD fabrication. In the first appointment, intraoral scanning was performed to generate STL files used for path of insertion determination in the CAD software. The need for a guide plane on tooth 15 was observed, thus a preparation guide was designed and 3Dprinted to aid axial tooth reduction. At the second visit, after mouth preparation, another intraoral scanning was performed to acquire virtual working models. The RPD framework was designed and 3D printed in a castable resin pattern and invested for cobalt-chromium alloy melting. In the third visit, clinical evaluation of the framework and teeth and artificial gingiva colors selection were performed. The articulated models were then 3D printed, enabling pre-fabricated teeth to be assembled and acrylized. On the fourth appointment, RPD was installed and the patient received routine instructions. In this sense, the use of CAD/CAM technologies presented as a valuable tool to enhance restoration of OVD by the manufacturing of RPD.

Preliminary evaluations on development of new materials for hip joint femoral head

2017 ◽  
Vol 233 (5) ◽  
pp. 885-899 ◽  
Author(s):  
Amit Aherwar ◽  
Amar Patnaik ◽  
Marjan Bahraminasab ◽  
Amit Singh
Keyword(s):  
Femoral Head ◽  
Testing Machine ◽  
Operating Conditions ◽  
Test Method ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Corrosion Properties ◽  
Mechanical Wear ◽  
Hardness Tester ◽  
Pin On Disc

Development and selection of a proper biomaterial with diverse properties (i.e. physical, mechanical, wear, corrosion, and many others) for hip femoral head is one of the most exigent tasks. Improper material often causes component failure during functioning. Therefore, in this study, a series of implant materials containing tungsten of different weight percentages were fabricated by high temperature vacuum casting induction furnace and the physical, mechanical, wear, and corrosion properties were examined. The proportions were varied from 0 wt% to 4 wt% in a cobalt–chromium alloy (Co–30Cr–4Mo–1Ni). The mechanical properties were tested by the micro-hardness tester and the compression testing machine, while the wear performance was analyzed through a pin-on-disc tribometer under different operating conditions at room temperature. Corrosion resistance was analyzed under NaCl solution by the electrochemical test method. Due to the conflict between the properties obtained, the Vise Kriterijumska Optimizacija Kompromisno Resenjemeaning (VIKOR) method integrated with analytic hierarchy process (AHP) was applied to choose the best material among the set of alternatives, where AHP was used to determine criteria weights, and VIKOR approach was used to rank the alternatives. From the results obtained, it was found that Co–30Cr–4Mo–1Ni implant material containing 2 wt% tungsten provides the best combination of the properties for a given application (i.e. hip femoral head).

Oxidation Coatings on Additively Manufactured CoCrMo

2017 ◽  
Author(s):  
Sujith Somanatha Panicker ◽  
Dheepa Srinivasan
Keyword(s):  
Heat Treatment ◽  
Additive Manufacturing ◽  
Aluminide Coating ◽  
New Technology ◽  
Microstructural Characterization ◽  
Thermally Grown Oxide ◽  
Direct Metal Laser Sintering ◽  
Cocrmo Alloy ◽  
Hot Gas ◽  
Cocrmo Alloys

Additive manufacturing (AM) via the direct metal laser sintering (DMLS) route is a new technology for both new make and repair application in gas turbine hot gas path components. This paper presents the development of a new oxidation coating Ceral 10 as a protective coating on the AM CoCrMo alloys. A high Al activity slurry aluminide coating (Ceral 10) was deposited on the DMLS CoCrMo. The coating produced on DMLS CoCrMo was uniform and intact having a thickness of ∼ 80–100 μm. The slurry aluminide coating showed an Inward diffusion with the DMLS CoCrMo substrate having an Al of 38–40 wt% and Si (12–13 wt%) after the diffusion heat treatment. The interface with the substrate was gradual in terms of chemistry with an interdiffusion zone of 15–20 μm. The Ceral10 coating showed limited oxidation up to 1038°C (1000 h) and at 1066°C (after 500 h), coating spallation occurred. The distinct thermally grown oxide between the coating-substrate interface led to the spallation. The effectiveness of the Ceral 10 coating to protect the DMLS CoCrMo alloy at high temperatures is evaluated via detailed microstructural characterization.

scholarly journals APPLICATIONS OF 3D PRINTING TECHNOLOGIES IN THE GARMENT INDUSTRY

2018 ◽  
Vol 16 (2) ◽  
pp. 104-107
Author(s):  
Veronica Verlan ◽  
Marcela Irovan
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Manufacturing Process ◽  
New Technology ◽  
Three Dimensional ◽  
Advanced Technology ◽  
Innovative Technologies ◽  
Three Dimensional Objects ◽  
Aesthetic Appearance ◽  
3D Printed

The usage of innovative technologies has become one of the most widespread ways of diversifying the current supply of clothing and footwear products. Therefore, using the 3D printing technologies in the garment production is a remarkable example of the symbiosis of creativity and technology, which creates unusual and fashionable clothing pieces. Although the 3D printing technology is a relatively new technology and allows creating unique garments it must not neglect important features of clothing products such as cost-accessibility, comfort and aesthetic appearance. The research on these aspects is prior to implement this technology in the manufacturing process. The study includes the analysis of the current 3D printing technologies which are used for obtaining three-dimensional objects, the current directions of implementing this technology in the industry, as well as the opportunities of applying this technology in the process of clothing’s creation. Therefore, this paper concludes the study with the creation of a clothing product – a blouse for women, which is including a 3D printed part confirming this way the possibility of creation of clothing products, which would integrate innovative elements which were obtained by implementing the advanced technology of additive manufacturing.

AM-Serienproduktion für die Automobilindustrie/AM series production for the automotive industry

2020 ◽  
Vol 110 (11-12) ◽  
pp. 752-757
Author(s):  
Lukas Weiser ◽  
Marco Batschkowski ◽  
Niclas Eschner ◽  
Benjamin Häfner ◽  
Ingo Neubauer ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Automotive Industry ◽  
Series Production ◽  
Production Scale ◽  
Additive Fertigung ◽  
Small Series ◽  
Start Up ◽  
3D Printed ◽  
Component Quality

Die additive Fertigung schafft neue Gestaltungsfreiheiten. Im Rahmen des Prototypenbaus und der Kleinserienproduktion kann das Verfahren des selektiven Laserschmelzens genutzt werden. Die Verwendung in der Serienproduktion ist bisher aufgrund unzureichender Bauteilqualität, langen Anlaufzeiten sowie mangelnder Automatisierung nicht im wirtschaftlichen Rahmen möglich. Das Projekt „ReAddi“ möchte eine erste prototypische Serienfertigung entwickeln, mit der additiv gefertigte Bauteile für die Automobilindustrie wirtschaftlich produziert werden können. Additive manufacturing (AM) offers new freedom of design. The selective laser-powderbed fusion (L-PBF) process can be used for prototyping and small series production. So far, it has not been economical to use it on a production scale due to insufficient component quality, long start-up times and a lack of automation. The project ReAddi aims to develop a first prototype series production to cost-effectively manufacture 3D-printed components for the automotive industry.

Fused Filament Fabrication 3D Printed Polylactic Acid Electroosmotic Pumps

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Liang Wu ◽  
Stephen Beirne ◽  
Joan-Marc Cabot Canyelles ◽  
Brett Paull ◽  
Gordon G. Wallace ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Polylactic Acid ◽  
Fused Filament Fabrication ◽  
Flexible Approach ◽  
Electroosmotic Pump ◽  
3D Printed ◽  
Electroosmotic Pumps

Additive manufacturing (3D printing) offers a flexible approach for the production of bespoke microfluidic structures such as the electroosmotic pump. Here a readily accessible fused filament fabrication (FFF) 3D printing...

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