Reducing the Core Losses of Fe-Si-B Amorphous Alloy Ribbons by High Cooling Rate Planar Flow Casting

In the planar flow casting (PFC) process, the cooling rate significantly affects the structure and properties of a cast ribbon. The influence of the thermal conductivity of the cooling wheel substrate on cooling rate was simulated by a numerical method, and it is shown that a higher thermal conductivity of the cooling wheel substrate leads to a higher cooling rate in the PFC process. Two copper-beryllium (Cu-2Be) rings with thermal conductivities of 175.3 W/m center dot K and 206.5 W/m center dot K were manufactured and installed onto a wheel core as the substrate of the cooling wheel. The effects of cooling rate on the soft magnetic properties of Fe-Si-B amorphous ribbons were investigated by pragmatic ribbon casting. The results show that the increment in the thermal conductivity of the cooling wheel substrate from 175.3 W/m center dot K to 206.5 W/m center dot K lowered the coercive force of amorphous ribbon from 2.48 A/m to 1.92 A/m and reduced the core losses at 1.4 T and 50 Hz by up to 22.1%.

Automated summary

In the planar flow casting process, the cooling rate plays a significant role in determining the structure and properties of a cast ribbon. By simulating the influence of the thermal conductivity of the cooling wheel substrate, it was found that a higher thermal conductivity leads to a higher cooling rate. The effects of cooling rate on the soft magnetic properties of Fe-Si-B amorphous ribbons were investigated, and it was observed that increasing the thermal conductivity of the cooling wheel substrate resulted in a reduction in coercive force and core losses of the amorphous ribbon.