Binder Saturation as a Controlling Factor for Porosity Variation in 3D-Printed Sandstone

2021 ◽  
Vol 62 (5) ◽  
pp. 450-462
Author(s):  
Kevin J. Hodder ◽  
◽  
Kaylee Craplewe ◽  
Sergey Ishutov ◽  
Rick Chalaturnyk ◽  
...  
Keyword(s):  
Silica Sand ◽  
Physical Aspect ◽  
Powder Materials ◽  
Physiochemical Properties ◽  
Dimensional Tolerance ◽  
Geomechanical Properties ◽  
Porosity Variation ◽  
3D Printed ◽  
Binder Saturation ◽  
3D Printing Technique

Binder jet additive manufacturing (BJ-AM) is a rapidly evolving 3D printing technique where the access to an array of powder materials is expanding. The use of silica sand has grown in popularity within the BJ-AM sector and has been shown to have a high potential of replicating physiochemical properties of natural materials for geoengineering applications. Consistent porosity is critical for 3D-printed samples used in rock testing since homogeneity between samples would provide unlimited capabilities in a laboratory setting. Binder saturation is one of the key user-set parameters that controls the ratio between the dimensional tolerance and porosity. Nonetheless, the binder saturation is an internal calculation by the printer’s software that relies on several assumptions, where the most important physical aspect is droplet spacing. This study establishes relationships between the droplet spacing, dimensional tolerance, binder saturation, and porosity. By holding the droplet volume constant and changing its spacing, better control of saturation was observed. Higher saturation reduced porosity and increased circularity of cylindrical samples, but overall dimensional tolerance of fine features was reduced. This study provides improvements of 3D-printed rock for the representation of porosity and geomechanical properties observed in natural sandstones.

scholarly journals Fracture Toughness of Hybrid Components with Selective Laser Melting 18Ni300 Steel Parts

2018 ◽  
Vol 8 (10) ◽  
pp. 1879 ◽  
Author(s):  
Luis Santos ◽  
Joel de Jesus ◽  
José Ferreira ◽  
José Costa ◽  
Carlos Capela
Keyword(s):  
Fracture Toughness ◽  
Selective Laser Melting ◽  
Compact Tension ◽  
Powder Materials ◽  
Layer By Layer ◽  
Laser Melting ◽  
Conventional Steel ◽  
Scan Rate ◽  
Aisi H13 ◽  
3D Printed

Selective Laser Melting (SLM) is currently one of the more advanced manufacturing and prototyping processes, allowing the 3D-printing of complex parts through the layer-by-layer deposition of powder materials melted by laser. This work concerns the study of the fracture toughness of maraging AISI 18Ni300 steel implants by SLM built over two different conventional steels, AISI H13 and AISI 420, ranging the scan rate between 200 mm/s and 400 mm/s. The SLM process creates an interface zone between the conventional steel and the laser melted implant in the final form of compact tension (CT) samples, where the hardness is higher than the 3D-printed material but lower than the conventional steel. Both fully 3D-printed series and 3D-printed implants series produced at 200 mm/s of scan rate showed higher fracture toughness than the other series built at 400 mm/s of scan rate due to a lower level of internal defects. An inexpressive variation of fracture toughness was observed between the implanted series with the same parameters. The crack growth path for all samples occurred in the limit of interface/3D-printed material zone and occurred between laser melted layers.

Controlled Release of Bi-Layered Malvidin Tablets Using 3D Printing Techniques

2021 ◽  
pp. 70-78
Author(s):  
Tejinder Kaur ◽  
Suruchi Singh
Keyword(s):  
Controlled Release ◽  
3D Printing ◽  
Fruits And Vegetables ◽  
Physical And Mechanical Properties ◽  
3D Printer ◽  
Anti Cancer ◽  
Printing Cost ◽  
3D Printed ◽  
Cost Efficient ◽  
3D Printing Technique

Malvidin belongs to the class of anthocyanidin, a pigment compound present in fruits and vegetables like the colored berries, flowers, and vegetables which have pigments on it and it is available commercially as malvidin chloride. Malvidin is known to possess many medicinal characteristics like anti-microbial, anti-diabetic, anti-inflammatory, anti-obesity, and anti-cancer. In this research paper, a 3D printing technique is used which evolves a 3D printer based on desktop that extrudes tablets comprising the active drug which here is malvidin our main ingredient and the other excipients which are used as binders and disintegrants. Methods which are adapted here for the formulation of 3D printed tablet make the tablets appropriate for immediate and sustained release with its definite physical and mechanical properties like hardness, friability, and weight. Tablets that are extruded by the 3D printer are controlled release bi-layer tablets. Due to involvement of 3D printer, printing cost for the bi-layered tablets found very low that makes our method as cost efficient.

Properties and applications of electrically conductive thermoplastics for additive manufacturing of sensors

2017 ◽  
Vol 84 (9) ◽  
Author(s):  
Benedikt Hampel ◽  
Samuel Monshausen ◽  
Meinhard Schilling
Keyword(s):  
3D Printing ◽  
Fused Deposition Modeling ◽  
Electrical Conductance ◽  
Electrically Conductive ◽  
Fused Deposition ◽  
Printing Technique ◽  
Deposition Modeling ◽  
3D Printed ◽  
3D Printing Technique ◽  
Printing Parameters

AbstractIn consequence of the growing diversity of materials in the fused deposition modeling 3D printing technique, electrically conductive materials are commercially available. In this work two filaments based on thermoplastics filled with carbon or metal nanoparticles are analyzed in terms of their electrical conductance. The printing parameters to process the materials with the 3D printer are optimized with the design of experiments (DoE) method. A model to calculate the resistance of such 3D printed structures is presented and a demonstrator as a proof of concept was 3D printed based on these results. In addition, 3D printing of capacitors is investigated.

scholarly journals A 3D Printable Thermal Energy Storage Crystalline Gel Using Mask-Projection Stereolithography

2018 ◽  
Author(s):  
Yuchen Mao ◽  
Takuya Miyazaki ◽  
Kohei Sakai ◽  
Jin Gong ◽  
Meifang Zhu ◽  
...  
Keyword(s):  
Energy Storage ◽  
3D Printing ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Uv Curing ◽  
Auxiliary Equipment ◽  
Printing Technique ◽  
3D Printed ◽  
Projection Stereolithography ◽  
3D Printing Technique

Most of the phase change materials (PCMs) have been limited to use as functional additions or sealed in containers, and extra auxiliary equipment or supporting matrix is needed. The emergence of 3D printing technique has dramatically advanced the developments of materials and simplified production processes. This study focuses on a novel strategy to model thermal energy storage crystalline gels with three-dimensional architecture directly from liquid resin without supporting materials through light-induced polymerization 3D printing technique. A mask-projection stereolithography printer was used to measure the 3D printing test, and the printable characters of crystalline thermal energy storage P(SA-DMAA) gels with different molar ratios were evaluated. For the P(SA-DMMA) gels with small fraction of SA, the 3D fabrication was realized with higher printing precision both on mili- and micro-meter scales. As a comparison of 3D printed samples, P(SA-DMAA) gels made by other two methods, post-UV curing treatment after 3D printing and UV curing using conventional mold, were prepared. The 3D printed P(SA-DMAA) gels shown high crystallinity. Post–UV curing treatment was beneficial to full curing of 3D printed gels, but did not lead to the further improvement of crystal structure to get higher crystallinity. The P(SA-DMAA) crystalline gel having the highest energy storage enthalpy that reached 69.6 J·g−1 was developed. Its good thermoregulation property in the temperature range from 25 to 40 °C was proved. The P(SA-DMAA) gels are feasible for practical applications as one kind of 3D printing material with thermal energy storage and thermoregulation functionality.

Electro Physical Hardening of Non Metallic Composite Materials in Additive Technology

2017 ◽  
Vol 265 ◽  
pp. 490-495
Author(s):  
I.V. Zlobina ◽  
N.V. Bekrenev ◽  
G.K. Muldasheva
Keyword(s):  
3D Printing ◽  
Strength Properties ◽  
Additive Technologies ◽  
Material Structure ◽  
Powder Materials ◽  
Additive Technology ◽  
Physical Hardening ◽  
Main Production ◽  
3D Printed ◽  
Physical Effects

The analysis of the prospects for the use of additive technologies in the production of aerospace equipment has been performed. It is shown that one of the main problems of implementation of these technologies in the main production is the lack of strength and endurance of 3D printing objects. The influence of electro physical effects of varying intensity on the strength properties of the objects from powder materials, formed by 3D printing has been researched. It is found that the electromagnetic field of medium intensity of the investigated range causes an increase in the flexural strength of the plates made of powder Zp130 impregnated with cyanoacrylate Z-Bond TM90, not less than 38%. Thus, a 24% decrease in pore size and reduction in their dispersion by almost 30% is noticed. It is shown that the composite material structure becomes denser with a large number of connections between the agglomerates. The increase in the number of connections, and the increased uniformity of the structure after the electrophysical influence is one of the mechanisms to improve the strength of 3D printed objects exposed to electro-physical influence.

Customizable 3D-printed architecture with ZnO-based hierarchical structures for enhanced photocatalytic performance

Nanoscale ◽  
2018 ◽  
Vol 10 (46) ◽  
pp. 21696-21702 ◽  
Author(s):  
Soomin Son ◽  
Pil-Hoon Jung ◽  
Jaemin Park ◽  
Dongwoo Chae ◽  
Daihong Huh ◽  
...  
Keyword(s):  
3D Printing ◽  
Photocatalytic Performance ◽  
Hydrothermal Reaction ◽  
Hierarchical Structures ◽  
Printing Technique ◽  
3D Printed ◽  
3D Printing Technique

ZnO-based hierarchical structures including nanoparticles (NPs), nanorods (NRs), and nanoflowers (NFs) on 3D-printed backbones were effectively fabricated via the combination of FDM 3D-printing technique and hydrothermal reaction.

scholarly journals Review of 3D Printed Millimeter-Wave and Terahertz Passive Devices

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Bing Zhang ◽  
Wei Chen ◽  
Yanjie Wu ◽  
Kang Ding ◽  
Rongqiang Li
Keyword(s):  
Surface Roughness ◽  
3D Printing ◽  
Millimeter Wave ◽  
Design Methodology ◽  
Device Fabrication ◽  
Printing Technology ◽  
Dimensional Tolerance ◽  
3D Printing Technology ◽  
Passive Devices ◽  
3D Printed

The 3D printing technology is catching attention nowadays. It has certain advantages over the traditional fabrication processes. We give a chronical review of the 3D printing technology from the time it was invented. This technology has also been used to fabricate millimeter-wave (mmWave) and terahertz (THz) passive devices. Though promising results have been demonstrated, the challenge lies in the fabrication tolerance improvement such as dimensional tolerance and surface roughness. We propose the design methodology of high order device to circumvent the dimensional tolerance and suggest specific modelling of the surface roughness of 3D printed devices. It is believed that, with the improvement of the 3D printing technology and related subjects in material science and mechanical engineering, the 3D printing technology will become mainstream for mmWave and THz passive device fabrication.

scholarly journals Development of 3D Printed Drug-Eluting Scaffolds for Preventing Piercing Infection

Pharmaceutics ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 901
Author(s):  
Emad Naseri ◽  
Christopher Cartmell ◽  
Matthew Saab ◽  
Russell G. Kerr ◽  
Ali Ahmadi
Keyword(s):  
Structural Integrity ◽  
High Resolution Mass Spectrometry ◽  
Complete Removal ◽  
Alternative Methods ◽  
Proton Nuclear Magnetic Resonance ◽  
Drug Eluting ◽  
3D Printed ◽  
Novel Drug ◽  
3D Printing Technique

Herein, novel drug-eluting, bio-absorbable scaffold intended to cover piercing studs is introduced. This “biopierce” will stay in human tissue following piercing, and will slowly release an antimicrobial agent to prevent infection while the wound heals. Nearly 20% of all piercings lead to local infection. Therefore, it is imperative to develop alternative methods of piercing aftercare to prevent infection. Biopierces were made using mupirocin loaded poly-lactic-co-glycolic acid (PLGA) biomaterial ink, and a low-temperature 3D printing technique was used to fabricate the biopierces. Proton nuclear magnetic resonance (1H NMR) spectroscopy was used to confirm the complete removal of the solvent, and liquid chromatography high-resolution mass spectrometry (LC-HRMS) was used to confirm the structural integrity of mupirocin and to quantify the amount of the released drug over time. The efficacy of the biopierces against Staphylococcus aureus, one of the most common piercing-site pathogens, was confirmed over two weeks using in vitro antimicrobial susceptibility testing.

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