3D Printing Briefs, January 29, 2022: Magnets, Materials and More – 3DPrint.com

We start with some interesting research on 3D printing molecular magnets in today’s 3D printing briefs, then move on to materials, as the Lehvoss Group plans to showcase its composite material solutions. BCN3D announces the availability of its Metal Pack and a new fiber loaded filament, as well as new autocalibration systems for its printers. Next, a 3D-printed fuel injection nozzle could make freighters more environmentally friendly. Finally, a man in Canada is facing charges after police seized two 3D-printed firearms from him.

3D printing of durable molecular magnets

Schematic figure of the 3D print size (in millimeters) of (a) the lattice structure
model and (b) the graphene structure model, (c) the krigami structure model and (d) the turbine
rotor model.

A collaborative team of researchers from the University at Buffalo, MIT, University of Utah, Lawrence Livermore National Laboratory (LLNL), and the University of Maryland have published a paper on their 3D printing work durable but unstable molecular magnets, which become stable when printed. Chemists have built molecular magnets in recent years that have magnetic fields comparable to conventional magnets at room temperature, but they are still sensitive to the environment. University at Buffalo materials scientist Shenqiang Ren and his team worked with MIT materials scientist Jeffrey Grossman to mix a molecular magnet with resin and use stereolithography to make magnets of complex shapes, which are then protected from environmental degradation thanks to the plastic housing. The researchers 3D printed a mixture of vanadium hexacyanochromate and polymer into shapes such as lattices and turbine rotors, which retained their magnetism after more than a year sitting on a shelf.

The abstract of the article states: “High-Jvs molecular magnets are very promising; however, the long-standing obstacle for its practical applications is the inaccessibility of high-temperature molecular magnets showing dynamic and non-volatile magnetization control. In addition, its functional durability is subject to degradation by oxygen and heat. Here we introduce a rapid prototyping and stabilization strategy for high Jvs (360 K) molecular magnets with precise spatial control of geometry. The printed molecular magnets are thermally stable up to 400K and stable in air for over 300 days, a significant improvement in its lifespan and durability. X-ray magnetic circular dichroism and computer modeling reveal the water ligands controlling the magnetic exchange interaction of molecular magnets. Molecular magnets also show dynamic and reversible tunability of magnetic exchange interactions, allowing a colossal working temperature window of 86 K (from 258 to 344 K). This study opens the way to flexible, lightweight and durable molecular magnetic devices through additive manufacturing.

LEHVOSS Group will present composite materials at JEC World 2022

Mold usable with lined cavity. In the foreground, component molded in CFRP

The LEHVOSS Group, under the leadership of Lehmann&Voss&Co., has developed several material solutions for composites and planned to showcase them at JEC World 2022 this month; however, the International Composites Show has been postponed to May, so they will have to wait a bit longer. Its first new material is LUVOGARD HF P70, a clear, halogen-free flame retardant liquid for thermosetting and thermoplastic resin applications that exhibits extremely low water solubility, a unique property that enables high weather resistance outdoors. . The material does not emit odors or smoke when decomposing, and when combined with other flame retardants has unique properties, although the press release did not list them.

LEHVOSS will also be showcasing vacuum film, COMBIMESH (infusion mesh + release film) and PEEL PLY, a nylon 66-based woven fabric that features zero residue and can be used to create a textured surface for better bonding or paint once it has been removed from the final composite material. Finally, the company has developed LUVOCOM 3F for 3D printing of rolling forms. 3D printed tools made to laminate prototypes or small runs are a more cost-effective way to make molds, thanks to its near-net-shaping capabilities and fine-finishing process. This material, based on a variety of thermoplastics such as PET, PPS, PEEK and PA, provides high strength final parts with high machinability and recyclability, reduced weight and warping, and can be used for low and high consolidation temperatures.

BCN3D: automatic calibration, metal pack and new PET CF15

BCN3D Technologies has been very busy lately and recently shared three press releases about what it has been up to. First, the company has introduced self-calibration on its printers, which it says will cut the tricky calibration time by 85% and also make the process more foolproof. BCN3D’s new electronics control a piezoelectric sensor, which is mounted on the print head between the X-axis and the hotend and senses pressure to accurately measure the distance between the print surface and the tip of the printhead. nozzle. The sensor can be used to measure print surface flatness in a process called mesh mapping, and a square perimeter on the back of the build plate calculates offsets between tool heads to ensure XY alignment. perfect for dual extrusion.

At Formnext, the company showcased its affordable Metal Pack for 3D printing stainless steel with its Epsilon series, and it’s now available for purchase. The Metal Pack enables the printing of stainless steel parts in three steps and includes an exclusive hotend for metal, complementary accessories and Ultrafuse® 316L and 17-4 PH filaments, which contain stainless steel and polymer binders . Users can then send 3D printed parts for debinding and sintering processes through the Forward AM supplier network. Finally, BCN3D has added PET CF15 (Carbon Fiber Reinforced Polyethylene Terephthalate) to its materials portfolio, which can be printed directly onto glass and has similar mechanical properties to PAHT CF15, but without moisture issues. The fiber filled material has less chemical resistance than PP GF30, but has less printability complexity, so it is a good mix of these two materials.

3D printed fuel injection nozzle

In a collaborative project between the Technical University of Denmark (DTU) and MAN Energy Solutions, researchers are investigating whether a 3D-printed fuel injection nozzle could make cargo ships more environmentally friendly. Thomas Dahmen, postdoc in mechanical engineering at DTU, conducted a study on this topic, first performing an analysis of the Quality Deployment Function for 3D Printing, or 3D-QFD, which offers insight into the value that 3D printing can bring to a product. He discovered that using a more curved design for the injector nozzle could result in better fuel flow, which in turn would help the engine burn better and possibly even reduce fuel consumption. engine NOx emissions. Dahmen also compared laser powder bed fusion (LPBF) and binder jetting technologies, and found that the latter was better for complex flow-related nozzle characteristics and special high-temperature materials. Due to its promising lab results, the 3D-printed injection nozzle was tested on MAN Energy Solutions’ full-scale test engine at the Copenhagen Research Center and performed very well.

“At MAN Energy Solutions, we have long known that 3D printed metal can provide us with opportunities to design important parts of our ship engines that were not possible before,” said Peter Hagen, Mechanical Engineer at MAN. EnergySolutions. “It made collaborating with DTU on exploring the potential an obvious choice.

“Thomas’ in-depth investigation has provided us with a fantastic foundation to move forward with 3D printing metal components for marine engines. I’m sure we’ll see them in real engines soon.

Man faces firearms charges over 3D-printed weapons

An RCMP-provided image of a gun’s lower receiver on a 3D printer.

Finally, Justin McMahon, 26, of Weyburn in Saskatchewan, Canada, is facing multiple firearms charges after he was found with multiple weapons, including two 3D-printed pistols. RCMP Crime Reduction Team officers were executing a search warrant when they found the weapons, and the firearms were all seized, while McMahon was charged with manufacturing a firearm. restricted licence, manufacturing a prohibited weapon and several charges of possession of prohibited and restricted weapons. for which he was not licensed. The Weyburn Police Department, the Canada Border Services Agency and the National Weapons Law Enforcement Support Team have been involved in the investigation, and McMahon is due to appear in court in response to the charges on March 8 at Weyburn. Staff Sergeant Scott Lambie of the Crime Reduction Team said in a written statement that it is illegal to manufacture a firearm, whether with 3D printing or other technology, to unless you have the correct firearms license:

“Illegal firearms can pose a risk to community safety and the Saskatchewan RCMP is committed to getting them off the streets. Illegally manufactured firearms are of particular concern because they have no serial number and therefore cannot be traced if used in a crime.

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