Project Objectives

Objective 1: Amorphous (Fe, Co, Ni)75 - (B, Si)25 soft magnetic powders prepared via mechanical
alloying. This objective assumes the elaboration and study of: (i) the Fe-based and Co-based amorphous alloys by mechanical alloying; (ii) the Fe-based and Co-based amorphous alloys by rapid quenching and comparative study from the structural, morphological, thermal stability, electric and magnetic view point of mechanically alloyed powders vs. rapid quenched alloys; (iii) the influence of milling conditions (wet or dry milling, speed ratio between vials and support disk, ball to powder weight ratio etc.) on the powder amorphisation and the above mentioned characteristics. Objective 2: Substitution of B and Si with different amount of Zr and/or Ti elements in the (Fe, Co, Ni)75 – (Zr, Ti)x - (B, Si)25-x; x = 0 - 5 systems.

Objective 2: Based on the optimal milling conditions (for Fe-based and Co-based alloys) determined during the first objective, the objective 2 assume the following scientific approach: (i) study of the effect of B and Si substitution with Zr and/or Ti, in various percentages on the milling time needed for amorphisation, thermal (glass stability), electric and magnetic characteristics of the powders. At the end of this objective, correlations study between powders characteristics and their chemical composition will be made in order to determine the most appropriate powders to be used during the third objective. These powders will be compacted by spark plasma sintering during the third objective.

Objective 3: Spark plasma sintered compacts produced from (Fe, Co, Ni)75 – (Zr, Ti)x - (B, Si)25-x
amorphous powders ; x = 0 - 5. Using all the information accumulated during the first two objectives, the goal of the third objective is to obtain Fe-based and Co-based amorphous soft magnetic cores. Investigation of the influence of sintering parameters such as: sintering temperature, holding time, applied pressure, heating/cooling speed, atmosphere etc. on the density, structural, electrical, magnetic characteristics of the compacts.