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 Switched-on DNA
20.02.2017 | Arizona State University

nachricht Using a simple, scalable method, a material that can be used as a sensor is developed
15.02.2017 | University of the Basque Country

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Microhotplates for a smart gas sensor

22.02.2017 | Power and Electrical Engineering

Scientists unlock ability to generate new sensory hair cells

22.02.2017 | Life Sciences

Prediction: More gas-giants will be found orbiting Sun-like stars

22.02.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>