Authors: Mária Mara, Ágnes Csanády, Gyula Tolnai, Péter Németh, Imre Bertóti, István E. Sajó, Katalin Papp, Hajnalka Hargitai
Abstract: In this work, novel types of colored, organic and water based paints have been developed. These paints can be produced less expensively and have equivalent or better properties compared to existing paints in the market. These new paints use organic nanocrystalline dyes (about 10 nm in size), which produce the various colors by absorption. The results are achieved with pigment composites containing nano-Cu-phthalocyanine (CuPC) pigment crystallites and finely precipitated and ground micro Al(OH)3 distance-holder (“spacer”) disks.
203
Authors: Ágnes Bajáki, János L. Lábár, Ágnes Csanády, Olga Geszti, Hajnalka Hargitai, Franciska H. Karman
Abstract: This work describes atomic-scale, crystalline structure and size distribution for noble
metal nanoparticles produced by water-based, environmental friendly technologies. The process
was developed and implemented to produce noble metal nanoparticles to be used in water filters,
sensors and cosmetics. The particles were investigated by TEM methods and particle size analysis.
Growth process of the crystallites in sols made by chemical reduction in aqueous solutions is
discussed. Comparison with growth models for vacuum deposited thin films is also identified.
115
Authors: Péter Németh, Ágnes Csanády, Katalin Papp, Anna C. Pintér, László Szabó, Zoltán Pászti, Attila Lajos Tóth, Erika Kálmán
Abstract: Protective, chromate substitute thin layers on roughened galvanized surfaces produced at OCAS
(Arcelor, Belgium) were characterized and compared using Scanning Electron Microscopy
(SEM+EDS), Atomic Force Microscopy (AFM), Nanoindentation and X-ray Photoemission
Spectroscopy (XPS). EDX maps, line scans and point analyses obtained at various places of the
surfaces have shown differences between the CVD and silane nanolayers in the matter of thickness
distribution and composition. At cross-section specimens the thickness of the layers could be
shown. The hardness differences caused by layer thickness variations are hard to follow by
nanoindentation as the penetration depth of the indenter is much larger than the thickness of the
coatings. XPS measurements can distinguish between the chemical states of silicon in CVD and
silane coatings.
433
Authors: Gyula Kakuk, Ágnes Csanády, István E. Sajó, Katalin Papp, Péter Németh, Hajnalka Hargitai, Anna Sztaniszláv
Abstract: 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.
397
Authors: Szabolcs Herczeg, János Takács, Ágnes Csanády, Gyula Kakuk, Jenő Sólyom, Ferenc Tranta, István E. Sajó, Katalin Papp, Hajnalka Hargitai
Abstract: 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.
391
Authors: Ágnes Csanády, László Ipacs, Gyula Kakuk, Erika Kálmán, Péter M. Nagy, Katalin Papp, István E. Sajó, András Szalay
Abstract: 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.
321
Authors: Péter M. Nagy, Ágnes Csanády, Balázs Verő, Gábor Pálinkás, Erika Kálmán
297
Authors: Erika Kálmán, Péter M. Nagy, Ágnes Csanády, Katalin Papp, Hajnalka Csorbai, Cs. Hunyadi, J. Telegdi
241
Authors: P.B. Barna, G. Zsigmond, Ágnes Csanády, Zs. Radi
197
Authors: Ágnes Csanády, I. Bertóti, M. Mohai, I. Perczel
155