Using gel casting to produce FeSiCr alloy powder molding chokes

Abstract

In this study molding chokes using FeSiCr alloy powder as the raw material were prepared by gel casting and the structures and magnetic properties of the samples prepared by dry pressing and gel casting were compared The experimental results showed that the low-viscosity slurry used in the gel casting process can significantly improve the powder filling uniformity in the center of the coil For the small-sized and high-inductance molding chokes the problem of the uneven packing in the center of the coils can be effectively solved by using gel casting thereby protecting the internal coil from being damaged and short-circuited Therefore the molding chokes prepared by gel-casting have higher inductance and better DC superposition characteristics than those prepared by dry pressing However if the viscosity of the slurry for the gel casting is too high the packing of the center of the coil becomes worse which leads to a lower inductance value The proportion of the liquid binder used in the gel casting is also lower than that in molding resulting in a higher initial permeability and the same or higher mechanical strength than that prepared by molding due to the more homogeneous distribution of the binder It shows that molding chokes made by gel casting has a great potential

Date of Award	2019
Original language	English
Supervisor	Hsing-I Hsiang (Supervisor)