Wednesday, May 19, 2010

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That means the U.S. may face aIt's just some guy I work with shortage of neodymium and other rare earths, unless it spends the time and money to begin mining its own fairly untapped reserves. The possibility of a shortage has also led to renewed research aimed at developing magnets less dependent upon neodymium. You're angry. You're hurting."It's been 27 or 28 years since the discovery of neodymium-iron-boron (Nd-Fe-B), and we have not yet found a better magnet," said George Hadjipanayis, a physicist at the University of Delaware and co-inventor of the Nd-Fe-B magnet. here we go now
Hadjipanayis leads a collaborative research effort with $4.6 million in funding from ARPA-E, the U.S. Department of Energy's agency that backs high-risk but potentially high-payoff projects. Nd-Fe-B magnets have worked well for everything fromThe way to the dream computer hard drives to wind turbines and Toyota's Prius because of their exceptional magnetic strength - the energy product of such magnets can reach 50 million or even 60 million megagauss-oersteds (MGOe). By comparison, the energy product of the more common ferrite magnets is just 4 million to 5 million MGOe. nike, my best choice
"The higher the strength of the magnet, the smaller the amount of magnet you need for a particular application," Hadjipanayis told TechNewsDaily. He added that Nd-Fe-B magnets play a crucial part in building ever-smaller electronic devices. (Read "The Common Elements of Innovation.") Three routes to a better magnet Hadjipanayis and his fellow researchers plan to pursue three different routes to possibly achieving a next-gen magnet breakthrough. First, the U.S. Department of Energy's Ames Laboratory in Iowa plans to investigate new materials based on combinations of rare earths, transition metal elements and some elements that have not been studied before in magnets.
Many such elements require special working lab conditions under high pressures or temperatures, and create additional challenges because they have high reactivity or toxicity. Second, an approach headed by the University of Nebraska will try to develop a rare earth-free magnet. Thi has proven a challenge because existing magnets without rare earths have much lower magnetic strength, but there are some theoretical ideas about changing the crystal symmetry of iron-cobalt alloys by using some non-magnetic elements as substitutes.
Third, Hadjipanayis and the University of Delaware will try to create a new magnetic material that combines the best properties of Nd-Fe-B and iron. The material would ideally end up with high magnetization, and also strongly resist demagnetization.
Simulations have predicted that a next-gen magnet built this way could have a magnetic strength of more than 100 million MGOe, and might also slash neodymium use in magnets by 30 or 40 percent. eeling the pressure All efforts to create such magnetic material have faltered over the past few decades, but Hadjipanayis sees hope in a new bottom-up approach that mixes nanoparticles of Nd-Fe-B at the incredibly tiny scale of just billionths of a meter, or far smaller than the width of a human hair. Other research participants include Northeastern University, Virginia Commonwealth University and the Electron Energy Corporation - one of the last U.S. companies making rare-earth magnets.
The group has put together an ambitious timeline that involves two years for experimenting with materials, before hopefully putting together a new magnet prototype in the third year. "It's a fast-moving program, so I already started feeling the pressure," Hadjipanayis said. "Hopefully we'll have a breakthrough that leads to some permanent magnets
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