Thermomagnetic analysis of soft magnetic nanocrystalline alloys

Nanocrystalline Soft Magnetic Iron-Based Materials from Liquid State to Ready Product

“…Figure 11 shows that the Curie temperature of the primary crystalline phase is the same for alloys with different silicon contents. After reaching the peak value µ max , the permeability decreases rather quickly, stabilizing at the level of µ st [50,63]. By that time, the diffusion of chemical elements, as well as the residual movement of grain boundaries, still continues.…”

“…When the amorphous ribbon is heated, crystallization and melting processes take place. At the first stage of crystallization, nanocrystalline grains are formed with an average size of about 10 nm [50]. It is important that in an amorphous ribbon prepared from an overheated melt, there are noticeably more small grains 1-2 nm in size [44].…”

“…An intense release of energy 386 and 88 kJ•mol −1 occurs at temperatures of 815 and 950 K and this corresponds to the peaks of crystallization and recrystallization. Figure 11 shows the change in time of the temperature and permeability of the cores made of Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 and Fe 73.5 Cu 1 Nb 2 Mo 1.5 Si 16 B 6 alloys during nanocrystallization in a furnace with a constant temperature of 813 K [50]. To fix the structure at different stages of crystallization, the cores were taken out of the furnace and quickly cooled in the time indicated by the dots in Figure 11.…”

“…The structure of sample 1 in Figure 11 represents an amorphous matrix with a small fraction of grains, the average size of which is 6 nm [50]. The maximum frequency distribution falls on grains 2 nm in size, which can be identified as nuclei of the crystalline phase.…”

Advanced Ferromagnetic Materials in Power Electronic Converters: A State of the Art

“…• Energy core losses. In addition, it should be always kept in mind that the material performance also relies on other factors such as: quality control in the manufacturing process, concentration and particle size of the materials used in the alloy, size, volume and shape of magnetic component, losses under different waveforms, frequency operation range, and magnetic material thick, among others [67], [86]- [88].…”