Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New, intelligent materials for use in mechanical actuators

29.01.2004


A research team at the Department of Physics at the Public University of Navarre are developing new, “intelligent” materials which have the capacity for changing shape when a magnetic field is applied to them. These materials may be used for the generation of ultrasonic signals, in the manufacture of loudspeakers and sonars or in actuators, amongst other applications. The project is a three-year one.



Specifically, the group at the Public University of Navarre is working on the optimisation of materials which were discovered at the beginning of the nineties: metal alloys having a ferromagnetic shape memory (FSMA). These alloys have the ability to change shape under mechanical pressure, in a magnetic field or with temperature variation, and to return, in a reversible manner, to its original shape when the stimulus ceases or is removed.

Magnetic modification


The principal use for these alloys having a ferromagnetic shape memory is in the manufacture of actuators, those devices which, on the application of a magnetic field, modify their dimensions in order to carry out operations. The advantage of these devices is that the operations in question can be controlled remotely using magnetic fields, without the need to resort to manual contact. As a result of the modification of the dimensions, the actuator can press a button or carry out any other mechanical operation in an industrial process.

Moreover, these metal alloys with ferromagnetic shape memory have a capacity for changing shape much greater than that of other metals, thereby providing us with an alternative to the current piezoelectric actuators, currently the most commonly used in industrial processes.

Beyond this use, the field of application of this type of alloy stretches from the generation of ultrasonic signals (for ultrasonic cleaning or ultrasonic transducers such as those used in ecographys...), to the application of a constant force (lineal force engines, positioners...), and taking in the cores of speaker and sonar devices, vibration dampers and a whole series of devices based on piezoelectric and magnetostrictor materials.

Development of new alloys

The aim of this research project is to find new alloys having a ferromagnetic shape memory, introducing materials such as aluminium, tin, cobalt, nickel or gallium.

To achieve this, in the first place, the Public University of Navarre is studying the vibrational behaviour and the elastic constants of monocrystalline alloys, for the subsequent application thereof to the more abundant polycrystalline alloys.

The monocrystal alloys are ordered structures, perfect crystallographic networks which enable the study of their properties with ease. Nevertheless, monocrystals involve a costly and demanding manufacture process so it is the polycrystals that are more frequent in commercial applications.

Garazi Andonegi | Basque research
Further information:
http://www.basqueresearch.com

More articles from Materials Sciences:

nachricht Tiny quantum sensors watch materials transform under pressure
13.12.2019 | DOE/Lawrence Berkeley National Laboratory

nachricht Light, strong, and tough: Researchers at the University of Bayreuth discover unique polymer fibres
13.12.2019 | Universität Bayreuth

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Virus multiplication in 3D

Vaccinia viruses serve as a vaccine against human smallpox and as the basis of new cancer therapies. Two studies now provide fascinating insights into their unusual propagation strategy at the atomic level.

For viruses to multiply, they usually need the support of the cells they infect. In many cases, only in their host’s nucleus can they find the machines,...

Im Focus: Cheers! Maxwell's electromagnetism extended to smaller scales

More than one hundred and fifty years have passed since the publication of James Clerk Maxwell's "A Dynamical Theory of the Electromagnetic Field" (1865). What would our lives be without this publication?

It is difficult to imagine, as this treatise revolutionized our fundamental understanding of electric fields, magnetic fields, and light. The twenty original...

Im Focus: Highly charged ion paves the way towards new physics

In a joint experimental and theoretical work performed at the Heidelberg Max Planck Institute for Nuclear Physics, an international team of physicists detected for the first time an orbital crossing in the highly charged ion Pr⁹⁺. Optical spectra were recorded employing an electron beam ion trap and analysed with the aid of atomic structure calculations. A proposed nHz-wide transition has been identified and its energy was determined with high precision. Theory predicts a very high sensitivity to new physics and extremely low susceptibility to external perturbations for this “clock line” making it a unique candidate for proposed precision studies.

Laser spectroscopy of neutral atoms and singly charged ions has reached astonishing precision by merit of a chain of technological advances during the past...

Im Focus: Ultrafast stimulated emission microscopy of single nanocrystals in Science

The ability to investigate the dynamics of single particle at the nano-scale and femtosecond level remained an unfathomed dream for years. It was not until the dawn of the 21st century that nanotechnology and femtoscience gradually merged together and the first ultrafast microscopy of individual quantum dots (QDs) and molecules was accomplished.

Ultrafast microscopy studies entirely rely on detecting nanoparticles or single molecules with luminescence techniques, which require efficient emitters to...

Im Focus: How to induce magnetism in graphene

Graphene, a two-dimensional structure made of carbon, is a material with excellent mechanical, electronic and optical properties. However, it did not seem suitable for magnetic applications. Together with international partners, Empa researchers have now succeeded in synthesizing a unique nanographene predicted in the 1970s, which conclusively demonstrates that carbon in very specific forms has magnetic properties that could permit future spintronic applications. The results have just been published in the renowned journal Nature Nanotechnology.

Depending on the shape and orientation of their edges, graphene nanostructures (also known as nanographenes) can have very different properties – for example,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

The Future of Work

03.12.2019 | Event News

First International Conference on Agrophotovoltaics in August 2020

15.11.2019 | Event News

Laser Symposium on Electromobility in Aachen: trends for the mobility revolution

15.11.2019 | Event News

 
Latest News

Supporting structures of wind turbines contribute to wind farm blockage effect

13.12.2019 | Physics and Astronomy

Chinese team makes nanoscopy breakthrough

13.12.2019 | Physics and Astronomy

Tiny quantum sensors watch materials transform under pressure

13.12.2019 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>