Time filter

Source Type

Roussi V.,Laboratory of Physical Metallurgy
Key Engineering Materials | Year: 2013

The purpose of this paper is to calibrate the magnetic field coming out of an excitation coil of certain specifications, fabricated for non-destructing testing of electrical steel sheets. Thus, a comparison between experimental and numerical analysis is discussed. For the experimental estimation of the magnetic field, a sensitive Hall sensor is used to measure the dc field at a vertical array of three selected points inside the coil. These are the lower, the middle and the upper point of the coil cross section, respectively. The magnetic field is then computed theoretically using the finite element method and the Biot-Savart law. Measured results are in agreement with the calculated results of the excitation field very well, within the limits of our experimental set-up. © (2013) Trans Tech Publications.


Giannouli C.,Laboratory of Physical Metallurgy
Key Engineering Materials | Year: 2013

Magnetite nanopowder is a nanostructured magnetic material which is of great importance due to its electric and magnetic properties at room temperature. There are quite enough methods to produce magnetite. In the present work, four samples of magnetite powder were produced, the first three with the alkaline precipitation method from aqueous solution of mixed Fe(II)/Fe(III) salts, without any surfactants and the last one with the micro emulsion method. The prepared powders have been characterized using transmission electron microscopy, Raman and FT-IR spectroscopy and x-ray diffraction in order the structure and the morphology of magnetite to be examined. The produced magnetite powders have a size range of 10-12±2nm and the chemical composition of magnetite. © (2013) Trans Tech Publications.


Fotopoulos P.,Laboratory of Physical Metallurgy
Key Engineering Materials | Year: 2012

The Barkhausen noise in low carbon steel is analyzed in this paper, illustrating a monotonic dependence on the degree of plastic deformation. © (2012) Trans Tech Publications.


Mpalliou A.,Laboratory of Physical Metallurgy
Key Engineering Materials | Year: 2012

The surface magnetic properties, namely Barkhausen noise and surface dc B-H loops and the microstructure of low carbon steel, namely electron back scattering diffraction, have been correlated in this paper, showing a good monotonic behavior. © (2012) Trans Tech Publications.


Dasargyri G.,Laboratory of Physical Metallurgy
Key Engineering Materials | Year: 2012

This research targets to localize the most stressed areas of the iron T-clamps of Epikourios Apollon temple (420 B.C.) during their production. This research aiming to localize their stress uses the method of counting the Barkhausen noise (BHN). © (2012) Trans Tech Publications.

Loading Laboratory of Physical Metallurgy collaborators
Loading Laboratory of Physical Metallurgy collaborators