Scalable submicrometer additive manufacturing

The work, reported in the journal Science ("Scalable submicrometer additive manufacturing"), was done by researchers from Lawrence Livermore National Laboratory (LLNL) and The Chinese University of Hong Kong. Sourabh Saha, the paper’s lead and corresponding author, is now an assistant professor in the George W. Woodruff School of Mechanical Engineering at the Georgia Institute of Technology. Positioning and motion tasks in industrial automation such as those in assembly, semiconductor manufacturing, mechanical engineering, laser material processing, inspection systems or in additive manufacturing demand solutions that need to be robust and reliable. 13.12.2016 · Tip-based nanofabrication (TBN) is a family of emerging nanofabrication techniques that use a nanometer scale tip to fabricate nanostructures. In this review, we first introduce the history of the TBN and the technology development. We then briefly review various TBN techniques that use different physical or chemical mechanisms. Oct 04, 2019 · Using a new time-based method to control light from an ultrafast laser, researchers have developed a nanoscale 3-D printing technique that can fabricate tiny structures 1000 times faster. X. Liu, C. Li, H. Li, X. Wang, and S. Chen, “Deep Learning-based Precision Control for Six-axis Compliant Nanopositioner,” Proceedings of the Annual Meeting. High energy ball milling, wet chemical synthesis (e.g., co-precipitation, hydrothermal, and sol-gel processing), sintering, integrated mechanical and thermal activation, and additive manufacturing are just several examples of the processing techniques that we have studied in order to attain novel properties for energy and structural applications. Mar 20, 2017 · 3D Systems Unveils Industry’s First Scalable, Fully-Integrated Additive Manufacturing Platform. New platform will transform production of mass customized and complex end use parts while meeting durability and repeatability requirements of production environments First shipment made to Fortune 50 industrial company CHICAGO, Illinois, March. Compression of amplified chirped optical pulses. Abstract. We have demonstrated the amplification and subsequent recompression of optical chirped pulses. A system which produces 1.06 μm laser pulses widths of 2 ps and energies at the millijoule level is presented. Recommended articles cannot be displayed Scale-up, on-chip applications, and additive manufacturing, which may provide solutions in areas as diverse as catalysis, sensing, and energy storage and conversion. INTRODUCTION Porous and hierarchically structured materials are highly desirable for a plethora of applications, ranging from separation, sensing, and energy conversion and storage. “The parallel two-photon system that has been developed is a breakthrough in nanoscale printing that will enable the remarkable performance in materials and structures at this size scale to be realized in usable components,” said LLNL’s Center for Engineered Materials and Manufacturing Director Chris Spadaccini. GE has been invested in additive manufacturing for years now, employing the technology throughout many of its operations, and in 2016 made the billion-dollar move to become a metal additive. 19.07.2016 · Driven by functionality and purity demand for applications of inorganic nanoparticle colloids in optics, biology, and energy, their surface chemistry has become a topic of intensive research interest. Consequently, ligand-free colloids are ideal reference materials for evaluating the effects of surface adsorbates from the initial. 13 days ago · Submicrometer additive manufacturing has a wealth of potential to microelectronics and medical sectors. For Saha at least, “The real application for this would be in industrial-scale production.

Engineering the vasculature with additive manufacturing. C Vyas, R Pereira, B Huang, F Liu, . Pickering emulsions stabilized by pH-responsive microgels and their scalable transformation to robust submicrometer colloidoisomes with selective permeability. W Wang, AH Milani R/realtech: Aladdin (/u/RealtechPostBot) is a simple bot I made to combat how /r/technology has became a highly political, repetitive, and somewhat. R/technology: Subreddit dedicated to the news and discussions about the creation and use of technology and its surrounding issues.

While most definitions of tissue engineering cover a broad range of applications, in practice the term is closely associated with applications that repair or replace portions of or whole tissues (i.e., bone, cartilage, blood vessels, bladder, skin, muscle etc.). Key Words: additive manufacturing, Advanced Manufacturing Laboratory (AML), Ambassador Lecture Series, climate science, high-energy-density science, National Ignition Facility (NIF), national security, outreach, Space Science and Security Program, University of California (UC). Testing Missile Technology Wire-Arc Additive Manufacturing for Reactive Metals; Lab-Wide Competitions. Metallopolymers as an Emergent Class of Materials for Additive Manufacturing of Graded Density Gold Foams; Construction of Solar Cells from Colloidal Nanocrystals through Electrophoretic Deposition. Oct 04, 2019 · Two-photon lithography (TPL)–based submicrometer additive manufacturing is a promising candidate to fill this gap. However, the serial point-by-point writing scheme of TPL is too slow for many applications. Attempts at parallelization either do not have submicrometer resolution or cannot pattern complex structures. Oct 17, 2019 · When it comes to implementing a scalable additive manufacturing workflow, an area that is often overlooked is the order management stage. For service bureaus and AM departments, order management refers to the process of receiving, tracking and fulfilling incoming orders efficiently.

Oct 04, 2019 · Existing nanoscale additive manufacturing techniques use a single spot of high-intensity light—typically around 700 to 800 nanometers in diameter—to convert. Oct 04, 2019 · Scalable submicrometer additive manufacturing October 4, 2019 - 1:11 AM Science Magazine Using light to build three-dimensional structures with photopolymerization is the basis for two-photon lithography. However, there has been a trade-off between speed and resolution for fabricating structures with this method.

PubFacts seeks to make the world's scientific research easy to locate, access, and collaborate. Additive Manufacturing accelerates nanoscale a thousandfold Share Tweet Google+ Pinterest LinkedIn Tumblr Email + With a new time-based method to control the light from an ultrafast laser, researchers have developed a nanoscale Additive Manufacturing technique that can fabricate tiny structures a thousand times faster than conventional two-photon lithography (TPL), without damaging resolution.

A review on 3D micro-additive manufacturing technologies. The International Journal of Advanced Manufacturing Technology, 2013. Hermann Seitz. Download with Google Download with Facebook or download with email. A review on 3D micro-additive manufacturing technologies. Download.

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Additive manufacturing of carbide machining tools

Researchers from Fraunhofer are co-operating to investigate how laser powder bed fusion can be used to additively produce cutting tools with longer tool life.

Tungsten carbide-cobalt is an excellent material for cutting tools as it is extremely heat- and wear-resistant. In the new research project “Additive Manufacturing of Machining Tools out of WC-Co — AM of WC-Co”, scientists from the Institute for Materials Applications in Mechanical Engineering IWM and the Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University as well as from the Fraunhofer Institute for Laser Technology ILT are now investigating how laser powder bed fusion can be used to process this material. It aims to additively produce cutting tools that achieve longer tool life thanks to complex cooling geometries.

Until now, cutting tools made of tungsten carbide-cobalt (WC-Co) could only be manufactured using complex sintering processes. Since these materials are so strong, on the one hand, and since the sintering technology only offer restricted geometrical freedom, on the other, cutting tools can only be shaped to a limited extent. This makes introducing complex cooling structures into the tools very costly or simply impossible.

In contrast, additive manufacturing processes offer a high degree of design freedom and near-net-shape production. This minimises finishing processes and also enables complex cooling structures to be generated within the cutting tool. Laser powder bed fusion (LPBF) is particularly suitable for this purpose. In this additive manufacturing process, the workpiece is built up layer by layer from the powder bed using the laser. This allows undercuts to be made and complex cooling geometries to be generated. In turbine construction, significantly higher operating temperatures have already been achieved thanks to the use of additively manufactured parts.

The laser-based additive manufacturing processes require a careful selection of the material and the process parameters so they can generate components with strengths comparable to those from conventional processes. In the new funding project “AM of WC-Co”, a group of Aachen research institutes will investigate this in more detail. The team includes Fraunhofer ILT, the Institute for Materials Applications in Mechanical Engineering IWM and the Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University.

The process development aims to generate a homogeneous and almost dense structure of the WC-Co-composite, as shown here by means of a scanning electron microscopy measurement.

The process development aims to generate a homogeneous and almost dense structure of the WC-Co-composite, as shown here by means of a scanning electron microscopy measurement. (Source: Fraunhofer ILT)

NIR emitter heats the component to over 800 degrees

A major problem in the LPBF process is the temperature distribution in the manufactured workpiece. The metal powder is melted in the laser spot and then quickly cools down. Conventional systems have a heated base plate to slow down the cooling process. However, this is not sufficient for refractory materials and large components in particular, as tensions and sometimes even cracks occur in the component.

The experts at Fraunhofer ILT have been working on this issue for several years and, in co-operation with the company Adphos Innovative Technologies GmbH, have developed a system in which a near-infrared (NIR) emitter heats the component from above. With an output of up to 12 kW, the emitter can achieve temperatures of up to 800 °C in the component. In the “AM of WC-Co” project, this technology is to be used to process tungsten carbide-cobalt.

For this purpose, the partners will investigate the complete process route from the powder materials to the additive manufacturing process up to post-processing and testing. The scientists will qualify those materials and processes that can be used to replace conventional sintering processes. Tungsten carbide cutting tools produced in this way should have a comparable hardness, but a longer service life than conventionally made cutting tools due to the cooling structures introduced via LPBF.

This should pay off especially when demanding materials need to be machined, such as titanium alloys. In addition, the system with NIR emitters for powder bed heating can pave the way for the processing of further refractory alloy systems.

The project “AM of WC-Co” is funded by the “Otto von Guericke e.V.” working group of industrial research associations. The project will last 30 months and began 1 October 2019.