Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond

Related Stories

Ultrasound cuts costs in producing aluminium alloys

Scientists at Brunel University London have confirmed that treating molten metal with ultrasound is a cleaner, greener and more efficient route to produce high quality castings.

Molten aluminium alloys at 700 °C naturally contain a high percentage of dissolved hydrogen, left untreated, the resulting solid metal is highly porous. The most widely- used method of hydrogen removal – argon rotary degassing - is energy intensive and requires costly components.

In pilot scale trials funded by EU Framework Seven Programme, the team, led by Prof Dmitry Eskin of the Brunel Centre for Advanced Solidification Technology, found that ultrasound was just as efficient as the standard method but produced far less waste material (dross) and was much greener.

Said Prof Eskin: “We know from industry that the price of argon gas continues to rise because making it requires producers to liquefy air which takes a lot of energy. There are also issues with the graphite impellers used. If they break in use the entire batch of alloy is contaminated and useless.

“Our pilot scale research with quantities of up to 150 kg confirmed earlier laboratory tests that a moving ultrasound probe could achieve the similar end results in terms of the resulting casting quality to using argon but with the advantages of not relying on expensive and fragile graphite rods and expensive gas which cannot be captured and recycled.

“The five-fold reduction of the amount of dross created is another benefit. Recovering useable metal from dross is also an expensive and energy intensive process that involves electrolysis.”

While the next aim of Prof Eskin’s team is to scale up the trials to the half-tonne level the eventual aim is to introduce cost-effective ultrasound de-gassing earlier in the production cycle.

He added: “Economic drivers like producing lighter engines and lighter car bodies are pushing process improvements in producing higher quality alloys much further back in the production cycle to where alloys are first smelted.

Ultrasound treatment holds out the promise of being able to de-gas effectively and continuously and we have already made some steps towards achieving this on the pilot level.”

Story Source:

The above story is based on materials provided by Brunel University. Note: Materials may be edited for content and length.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners