Effect of Aluminium Addition on the Magnetic Properties of a Semi-Processed Electrical Steel

Abstract

Aluminum is often added to electrical steels since this element causes improvement of the magnetic properties. However the addition of aluminum is usually limited to 0.30 wt% 1 . Therefore, this work aimed at evaluating the influence of higher levels of aluminum in the magnetic properties of semiprocessed steels. To accomplish this, four types of steel were produced in laboratory with different aluminum contents (0.10, 0.30, 0.60 and 1.0 wt%). Carbon, manganese and silicon concentrations were kept constant. It was observed that an increased aluminum content caused reduction of the magnetic core loss, especially of the eddy current component. However, the magnetic permeability virtually wasn't influenced by aluminum concentration.

Hybrid Ni–Boron Nitride Nanotube Magnetic Semiconductor—A New Material for Spintronics

“…The peaks at 75 eV and around 120 eV correspond to Al 2p and Al 2s, respectively; these peaks arise from the alumina crucible which was used to synthesize the BNNTs. Presence of aluminum does not affect the magnetic property of the material …”

“…Presence of aluminum does not affect the magnetic property of the material. 28 In Figure 6b,c, individual deconvoluted binding energies of nitrogen and boron are shown. The presence of carbon and oxygen in the spectrum is from the instrument itself and exposure to the atmosphere.…”

Disparity in recrystallization of α- & γ-fibers and its impact on Cube texture formation in non-oriented electrical steel

“…This is important so that the austenite phase will not be able to create a stable phase in electrical steel during heat treatment and processing. Both Si and Al increase electrical resistivity and reduce eddy currents 26 . However, addition of these elements will reduce the polarization magnetization of the alloy 25,26 .…”

“…Both Si and Al increase electrical resistivity and reduce eddy currents 26 . However, addition of these elements will reduce the polarization magnetization of the alloy 25,26 . Furthermore, high Si content alloys (> 3.2 w%) are difficult to process due the Si effect on alloy ductility, while high Al content alloys present issues during annealing as Al has high affinity for oxygen, making the alloy more brittle.…”

Correlation between Magnetic Properties and Chemical Composition of Non-Oriented Electrical Steels Cut through Different Technologies

“…Nitrogen reacts with Al and the resulted AlN particles, which as well as MnS, hinder the magnetic domain wall movement. If they are thin, an inhibition of the grain growth is observed, during the electrical steel decarburization step [41,42]. The hysteresis energy loss (see Figure 13b) was computed by extrapolating the total energy loss values as a function of frequency toward zero.…”