The main task of our work was to study the influence of high energy ball milling on the process of
W-type hexaferrite material production and to compare the structural, morphological and magnetic
features of the different manufacturing ways. The products are analyzed mainly by XRD, SEM and
TEM methods. It was shown that high energy ball milling can be used to enhance the synthesis of
W-type Ba-hexaferrite due to the much smaller crystallite sizes and their larger surfaces that are
produced by the milling process and due to the activation of these surfaces.
The aim of the present work is to produce new types of solid nanomaterials for different
purposes (coatings, fillers, foams, bulk pieces, etc.). Technologies such as RS Al flake
production, high energy mechanical milling and high energy rate forming technology (HERF)
for compacting are used. The products are analyzed mainly by XRD, SEM and TEM methods.
It was shown that the new-type of RS Al “flake” material is suitable not only for pigments but
also for powder metallurgical purposes, i.e. Al based nanocomposites.
By choosing suitable parameters for mechanical alloying with the Fritsch Planetary mill 4,
very fine, alloyed and composited nanostructures can be produced (Al-4.5w%Cu-
10w%Al2O3, Al-15w%Pb)
Dynamic compaction (HERF) using explosive techniques seems to offer a good way for the
compaction of Al (metal) matrix nanostructured composites.
The comparison of the phase transformations going on due to high energy ball milling (HEBM) and
produced by pressure-less Direct Metal Laser Sintering (DMLS developed by EOS company) was
carried out, by using an α-Fe, Ni and Cu3P powder mixture. It could be shown by X-ray
diffractograms (XRD) of the two type of products, that by mechanical alloying a similar phase
transformation occurs due to solid state reactions between the metal partners as in the case of laser
sintering, in a given range of laser scanning speed in a laboratory laser equipment. According to the
XRD evaluation the same metastable, γ-steel like phases were formed.
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