The role of chemical composition and processing conditions on Soft magnetic materials behaviour

摘要

The present paper focused on the analysis of the fracture surfaces and magnetic properties of a new development Insulated Iron Powder Compound (IIPC) with addition of the aluminium alloy in order to investigated bonding evolution in investigated materials. Results show that in the pressed state, mainly pores act as crack initiators and due to their presence the distribution of stress is inhomogeneous across the cross section and leads to the reduction of the effective load bearing area. Heat treatment supplement to diffusion and stress relaxation, therefore, reduce their size. The lower values of impact energy are confirmed by brittle fracture observed thorough fracture surfaces for both processing conditions. Investigation of fracture surfaces concluded that improvements in bonding during the pressing process and heat treatment can be helpful in the development of Soft Magnetic Composite (SMC) to give a suitable combination between pressing pressure, annealing temperature and time as well as magnetic properties.