Fabrication of Magnetizable Concrete for Wireless Power Transfer and Its Properties

Electric vehicles face range limitations, and expanding battery capacity raises cost and environmental concerns. Dynamic wireless power transfer (DWPT) offers a solution by charging electric vehicles while driving, but conventional road materials reduce transmission efficiency. Magnetizable concrete, in which magnetic materials are used as concrete aggregates, was considered to improve the efficiency of power transmission for DWPT. The use of plate-like Mn–Zn ferrite powder (to increase permeability) and Fe–10Si–5Al powder made from a crushed dust core (to reduce eddy current loss) was examined to enhance the properties of magnetizable concrete. In addition, a mixture of magnetic powders with different particle sizes was used as an aggregate to increase the filling rate of the magnetic powders in the concrete. As a result, magnetizable concrete with the following properties was obtained: cement concrete using plate-like Mn–Zn ferrite powder showed a specific permeability of 73 and iron loss (85 kHz and 0.05 T) of 270 kW/m3; geopolymer concrete using Fe–10Si–5Al powder showed a specific permeability of 21 and iron loss of 300 kW/m3.