Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Nano-structured parts

Abstract:
Materials with a nanoparticle structure are stronger and harder than materials made of larger particles. A new manufacturing technique ensures that such microcrystalline structures remain intact when being processed.

Nano-structured parts

Germany | Posted on February 3rd, 2009



Aluminum is light but also bends easily. However, if it has a nanometer structure, it features quite different properties: The material is much stronger and firmer, and this makes it ideal for engine screws, which have to withstand high temperatures. It is also eminently suitable for making lightweight parts, for the stronger the material, the thinner the sheets for the components can be made. The material's properties are mainly due to the tiny size of its crystals. These are much smaller than those in conventional materials, hence the designation "microcrystalline structures".

One of the challenges posed by such nano materials lies in processing them to make tools or components. Pressing or joining requires that the material be heated. This causes the crystals to grow, so the structures become larger. In short, the material loses its "nano properties" as it heats up. Researchers at the Fraunhofer Institute for Manufacturing Engineering and Applied Materials Research IFAM in Dresden have risen to the challenge. "Our goal is to preserve the material's microcrystalline structure throughout the entire component manufacturing process," states IFAM project manager Dr. Ronny Leuschner. To this end, the researchers have set up a special technology chain for manufacturing nano-structured aluminum and other materials. "First of all, we produce a special aluminum alloy," says Leuschner. "The metal melt has to be cooled very rapidly, so we virtually freeze it." This is done using the "melt spinning" technique: A specially developed spraying device pours the melt onto a water-cooled rotating roller, producing uniform strips or "flakes" no more than a few micrometers thick. As soon as it hits the roller, the melt rapidly loses heat and the flakes solidify at top speed. The advantage of this system is that it can handle several kilograms of material and withstand temperatures of more than 1700 degrees Celsius. "Once they have solidified, the flakes need to be compacted and pressed into the desired shape," explains Leuschner. During this step, too, their microcrystalline structures must remain intact. The method the researchers use in this case is spark plasma sintering: High-frequency current pulses inside the press compact the material in a very short space of time so that the fine microstructures are preserved. Applications for these nano materials range from lightweight aluminum parts with greater strength and improved wear and corrosion resistance, to hydrogen storage, energy production with thermoelectric materials, and electrical engineering.

####

For more information, please click here

Contacts:
Dr.-Ing. Ronny Leuschner
Phone: +49 351 2537-397
Fax: +49 351 2554-492
Fraunhofer Institute for Manufacturing Technology and Applied Materials Research
IFAM-DD
Winterbergstr. 28
01277 Dresden

Copyright © Fraunhofer-Gesellschaft

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Scientists reveal breakthrough in optical fiber communications December 21st, 2014

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Discoveries

Scientists reveal breakthrough in optical fiber communications December 21st, 2014

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Materials/Metamaterials

Aculon Hires New Business Development Director December 19th, 2014

ORNL microscopy pencils patterns in polymers at the nanoscale December 17th, 2014

Pb islands in a sea of graphene magnetise the material of the future December 16th, 2014

Graphene Applied in Production of Recyclable Electrodes December 13th, 2014

Announcements

Scientists reveal breakthrough in optical fiber communications December 21st, 2014

Atom-thick CCD could capture images: Rice University scientists develop two-dimensional, light-sensitive material December 20th, 2014

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

Instant-start computers possible with new breakthrough December 19th, 2014

Energy

Oregon researchers glimpse pathway of sunlight to electricity: Collaboration with Lund University uses modified UO spectroscopy equipment to study 'maze' of connections in photoactive quantum dots December 19th, 2014

How does enzymatic pretreatment affect the nanostructure and reaction space of lignocellulosic biomass? December 18th, 2014

Iranian Scientists Use Nanotechnology to Increase Power, Energy of Supercapacitors December 18th, 2014

Lifeboat Foundation gives 2014 Guardian Award to Elon Musk December 16th, 2014

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE