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.