Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Purity Characterization of Aluminium Melts by Ultrasonic Scattering Measurements

07.06.2016

The Fraunhofer Institute for Nondestructive Testing IZFP carries out research and development activities in the field of nondestructive testing processes along the entire materials value chain. For customers in the automobile, aerospace, rail, energy, construction and agriculture industries, the institute offers a wide range of NDT expertise and technologies. From June 13 to 17, 2016, our researchers and engineers will present first results from measurements on a model suspension concerning purity characterization of Aluminium melts by ultrasonic scattering at the 19th World Conference on Non-Destructive Testing (WCNDT) in Munich.

The use of Aluminium cast materials in industrial applications has a rising trend in Germany. One reason is the low density combined with the high specific mechanical strength. Another reason is the good machinability and corrosion resistance of this material group.


AIR-COUPLED ULTRASOUND INSPECTION

Fraunhofer IZFP/Uwe Bellhäuser

The growing trend towards lightweight construction results in components made of aluminium casting alloys with wall thicknesses getting thinner and thinner. That’s the reason why non-metallic inclusions are tolerated less and less. Most frequently oxides and carbides occur as such non-metallic inclusions.

Those impurities in the manufacture of castings are the most common defects, which entail costly cleaning methods to avoid defective goods. Therefore, a test device to detect impurities in the form of oxides with 20-300 µm in diameter is now being developed at the Fraunhofer IZFP. Characterizing the purity of the melt, the manufacturers can apply a specific cleaning.

At the WCNDT first results from measurements on a model suspension consisting of water and PMMA spheres will be discussed and presented. The advantage is that in a simple manner defined particles can be introduced and difficulties, caused by high temperatures, are bypassed first.

One important step was the determination of the optimal test frequency with knowledge of the ultrasonic scattering theory. Numerical calculations from analytical solutions of the scattering theory and measurement results could be compared.

Thus we will be able to determine the particle size and quantity from ultrasonic amplitude signals. Taking account of different melt qualities we are able to measure with two different methods.

The first one is suitable for melts with an impurity of more than 0.05 Vol% and is based on a multiple scattering model.

To detect less than 50000 particles/kg aluminium melting a single scattering approach is used. For further tests in aluminium melts the development of a wave guide has to be done.

Weitere Informationen:

http://www.izfp.fraunhofer.de

Sabine Poitevin-Burbes | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

More articles from Materials Sciences:

nachricht Researchers printed graphene-like materials with inkjet
18.08.2017 | Aalto University

nachricht Superconductivity research reveals potential new state of matter
17.08.2017 | DOE/Los Alamos National Laboratory

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

A Map of the Cell’s Power Station

18.08.2017 | Life Sciences

Engineering team images tiny quasicrystals as they form

18.08.2017 | Physics and Astronomy

Researchers printed graphene-like materials with inkjet

18.08.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>