Thermal conductivities and mechanical properties of AlN ceramics fabricated by three dimensional printing

2020 ◽  
Vol 40 (10) ◽  
pp. 3535-3540 ◽  
Author(s):  
Wenyan Duan ◽  
Shan Li ◽  
Gong Wang ◽  
Rui Dou ◽  
Li Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Dimensional Printing ◽  
Thermal Conductivities

scholarly journals Effect of Three-dimensional Printing with Nanotubes on Impact Resistance

2019 ◽  
Author(s):  
Anne Schmitz
Keyword(s):  
Mechanical Properties ◽  
Lower Limb ◽  
Impact Resistance ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Impact Tester ◽  
The Impact ◽  
Dimensional Printing ◽  
Pendulum Impact ◽  
Pendulum Impact Tester

Abstract The types of biomedical devices that can be three-dimensional printed (3DP) is limited by the mechanical properties of the resulting materials. As a result, much research has focused on adding carbon nanotubes (CNT) to these photocurable polymers to make them stronger. However, there is little to no data on how CNTs affect the impact resistance of these polymers, an important property when designing and manufacturing lower limb prosthetics. The objective of this study was to expand the use of 3DP to prosthetics by testing the hypothesis that adding CNTs to a stereolithographic (SLA) photocurable resin will result in a cured polymer with increased impact resistance. Twenty-six total specimens: 13 with nanotubes and 13 without nanotubes, were printed on a Form2 SLA printer. Once all the specimens were printed, washed, and cured, the impact resistance was quantified using a pendulum impact tester in a notched Izod configuration. Contrary to the hypothesis, the specimens with SWCNTs (0.312 ± 0.036 ft*lb/in) had a significantly lower impact resistance compared to the non-SWCNT specimens (0.364 ± 0.055 ft*lb/in), U = 34.0, p = 0.004. This decreased impact resistance may be due to voids in the printed polymer around the aggregated nanotubes. Thus, SLA polymers still do not have the impact strength needed to be used for a full lower limb prosthetic.

scholarly journals Remanufacturing of end-of-life glass-fiber reinforced composites via UV-assisted 3D printing

2019 ◽  
Vol 26 (6) ◽  
pp. 981-992
Author(s):  
Andrea Mantelli ◽  
Marinella Levi ◽  
Stefano Turri ◽  
Raffaella Suriano
Keyword(s):  
Mechanical Properties ◽  
Circular Economy ◽  
Three Dimensional ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Content Type ◽  
Three Dimensional Printing ◽  
Glass Fiber Reinforced ◽  
Complex Shapes ◽  
Dimensional Printing

Purpose The purpose of this study is to demonstrate the potential of three-dimensional printing technology for the remanufacturing of end-of-life (EoL) composites. This technology will enable the rapid fabrication of environmentally sustainable structures with complex shapes and good mechanical properties. These three-dimensional printed objects will have several application fields, such as street furniture and urban renewal, thus promoting a circular economy model. Design/methodology/approach For this purpose, a low-cost liquid deposition modeling technology was used to extrude photo-curable and thermally curable composite inks, composed of an acrylate-based resin loaded with different amounts of mechanically recycled glass fiber reinforced composites (GFRCs). Rheological properties of the extruded inks and their printability window and the conversion of cured composites after an ultraviolet light (UV) assisted extrusion were investigated. In addition, tensile properties of composites remanufactured by this UV-assisted technology were studied. Findings A printability window was found for the three-dimensional printable GFRCs inks. The formulation of the composite printable inks was optimized to obtain high quality printed objects with a high content of recycled GFRCs. Tensile tests also showed promising mechanical properties for printed GFRCs obtained with this approach. Originality/value The novelty of this paper consists in the remanufacturing of GFRCs by the three-dimensional printing technology to promote the implementation of a circular economy. This study shows the feasibility of this approach, using mechanically recycled EoL GFRCs, composed of a thermoset polymer matrix, which cannot be melted as in case of thermoplastic-based composites. Objects with complex shapes were three-dimensional printed and presented here as a proof-of-concept.

Metallurgical Affects of Three Dimensional Printing Based Rapid Casting Solution

2011 ◽  
Vol 701 ◽  
pp. 1-8
Author(s):  
Rupinder Singh
Keyword(s):  
Heat Transfer ◽  
Mechanical Properties ◽  
Surface Finish ◽  
Dimensional Stability ◽  
Transfer Rate ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Rapid Casting ◽  
Black Art ◽  
Dimensional Printing

Three dimensional printing (3DP) as rapid casting (RC) solutions has transformed over centuries from black art to science, but the metallurgical impinge on the process responsible for change in mechanical properties (like: surface finish, hardness, dimensional stability etc.) are still disputed. The purpose of the present research paper is to review metallurgical affect of 3DP based RC solution. The result of study suggests that prominent reason found to be responsible for improving the mechanical properties of RC is control of heat transfer rate while solidification (thus reducing dendrite formation).

Experimental investigations for reducing wall thickness in zinc shell casting using three-dimensional printing

2008 ◽  
Vol 222 (12) ◽  
pp. 2427-2431 ◽  
Author(s):  
M Kaplas ◽  
R Singh
Keyword(s):  
Mechanical Properties ◽  
Shell Thickness ◽  
Three Dimensional ◽  
Dimensional Accuracy ◽  
Zinc Alloy ◽  
Experimental Investigations ◽  
Economic Point ◽  
Three Dimensional Printing ◽  
Measuring Machine ◽  
Dimensional Printing

The purpose of this study is to verify the feasibility of decreasing the shell thickness in rapid casting (RC) process based on three-dimensional printing technology and to evaluate the dimensional accuracy, mechanical properties of RC solutions for the production of zinc-alloy casting. Starting from the identification of component/benchmark, technological prototypes were produced with different shell thickness. Measurements on a coordinate-measuring machine helped in calculating the dimensional tolerances of the castings produced. Some important mechanical properties were also compared to verify the suitability of the castings, and further results are supported by the radiography analysis. The study suggested that the shell thickness having value less than the recommended one is more suitable from dimensional accuracy and economic point of view. The provided data from the experimentation are extremely useful for the industrial application of the considered technology. The result indicates that at 7 mm shell thickness, hardness of the casting improved from the recommended 12 mm. Further, production cost and production time have been reduced by 41 and 37 per cent, respectively, in comparison with the 12 mm recommended shell thickness.

Three-Dimensional Printing of Stainless Steel Parts

2008 ◽  
Vol 591-593 ◽  
pp. 374-379 ◽  
Author(s):  
Efrain Carreño-Morelli ◽  
Sebastien Martinerie ◽  
Lisa Mucks ◽  
B. Cardis
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Three Dimensional ◽  
Tensile Tests ◽  
Layer By Layer ◽  
Metal Powders ◽  
Selective Deposition ◽  
Three Dimensional Printing ◽  
Dimensional Printing ◽  
Metal Polymer

Stainless steel parts have been manufactured by two different layer by layer additive processes. The first one is a standard three dimensional process, in which metal powders are bound by selective deposition of binder with a printer head. The second one is a novel process, which is based on the selective deposition of a solvent on metal-polymer granule beds. The microstructures of green and sintered parts are characterized by optical and scanning electron microscopy, and the mechanical properties evaluated by hardness and tensile tests. Solvent on granule printing allows to reach mechanical properties similar to those of metal injection moulding parts.

An assessment of thermosetting infiltrate in powder-based composites made by additive manufacturing

2018 ◽  
Vol 53 (7) ◽  
pp. 873-882 ◽  
Author(s):  
Breno Ferreira Lizardo ◽  
Luciano Machado Gomes Vieira ◽  
Juan Carlos Campos Rubio ◽  
Tulio Hallak Panzera ◽  
João Paulo Davim
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Porous Structure ◽  
Epoxy Polymer ◽  
Complex Geometry ◽  
Microstructural Analysis ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Small Series ◽  
Dimensional Printing

Rapid prototyping for material deposition or additive manufacturing has been widely used for short time production of parts with complex geometry in small series. The three-dimensional printing process needs post-processing to improve the strength, stiffness and/or surface finish of the parts. Printed parts in pristine condition are generally very brittle with a porous structure, so infiltrates have been introduced to improve their mechanical and physical characteristics. This work investigates the effect of two infiltrates, epoxy polymer and cyanoacrylate, under a vacuum pressure system on the mechanical properties of powder-based composites made by three-dimensional printing. Samples printed under pristine and infiltrated conditions were tested under tensile, flexural, compressive and impact loadings. The infiltrated samples achieved superior mechanical properties, especially when the epoxy polymer was applied via a vacuum system. The microstructural analysis showed that the infiltrates were not able to penetrate the entire sample, revealing a porous structure in the centre, mainly when the cyanoacrylate was used. The epoxy polymer infiltrate was able to substantially increase the mechanical performance of three-dimensional samples, being a promising material when higher structural requirements are required.

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