Abstract: Thermal plasma processes play nowadays a key role in many industrial applications, such
as powder densification and spheroidization, synthesis of nano-powders, treatment of waste
materials and spraying of thin coatings. Although many of these applications have been fully
implemented industrially for many decades, modelling plays an important factor in their continued
development and improvement. 3-D simulation of the behaviour of commercial inductively coupled
(RF) plasma can be useful tool to predict the main features of plasma assisted treating and
processing of injected raw materials. The effects of changing coil current frequency, the hydrogen
mixing in argon primary gas and the flow patterns and temperature distributions have been
investigated. 3-D time-dependent modelling DC non-transferred arc plasma torch for plasma
spraying operating at atmospheric pressure can allow the prediction of particle trajectories and
thermal history, the analysis of the influence of the plasma jet cold gas entrained eddies on particle
behaviour and the mechanisms that can lead to a fluctuating and non homogeneous heating of the
particle stream. All computations have been performed using a customized version of the CFD
commercial code FLUENT©.
Abstract: Ti–Si–C coatings were formed at room temperature on AISI 316L steel substrates by dual beam ion
assisted deposition technique from single compound Ti3SiC2 target. Scanning and transmission
electron microcopy method were used to examine as-deposited coatings. Their morphology was
smooth and dense and their thickness were in the range from 100 nm to 1μm. Raman spectra of
coated substrates were collected up with five peaks at the same positions as for Ti3SiC2 compound
target. TEM and HRTEM examinations, accompanied by SAED analyses revealed that deposited
films were amorphous. Nanoindentation tests were provided on coated and uncoated substrates and
hardness HIT and reduced elastic modulus EIT were calculated using the Oliver & Pharr method.
Abstract: Poly(etherether-ketone)-alumina coating were deposited by EPD. In order to densify the
coatings, conventional thermal treatments were performed at a temperature equal or higher than the
melting point of the polymer. The samples treated at the lower temperature showed an increase in
the quality of crystallinity of the polymer. As an alternative method, an excimer laser was used to
treat the surface of the composite coatings. The laser beam irradiation did not induce any
modification in the crystalline structure of the polymer and at the same time did not produce strong
degradation of the polymer molecule, also when the laser beam fluence was higher than the ablation
limit. The most relevant modification induced by both the treatments was a change in the
morphology and the porosity.
Abstract: Good dispersion of active catalytic elements, their uniform distribution on the carrier’s surface and
availability for neutralised combustion gases are key factors that determine the usability of catalyst
cartridges for automotive catalytic reactors. By examining the morphology of oxide films, with
SEM/STEM method, obtained by oxidation of foil coated with Pt/Al two-layered system (like
laminate), where an Al nanofilm is situated between steel foil and a Pt nanofilm, one can observe
forked and plate whiskers growing directly of substrate. Oxide films obtained from Pt+Al
composite nanofilms were formed differently (where components are intermixed). These films are
marked by chaotic, mutually penetrating fine equiaxed solids and whiskers. In case of composite
nanofilms the grain system obtained in the course of deposition contributed to good Pt grain
refining, and due to that mostly particles from 3 to 9 nm in conventional diameter were formed.
Direct contact between Pt particles and Al particles caused the partial occlusion of Pt particles with
oxide in the process of Al oxidation to be effected.
Abstract: Poly(etherether-ketone) (PEEK) suspensions in ethanol and isopropanol containing also
α-alumina and hydroxyapatite powders were studied. An innovative method was used in the study
of the quality of suspensions. We studied suspensions by means of zeta potential and grain-size
measurements. The comparison amongst the different suspensions was carried out by using
statistical and chemometric tools, especially by the use of an explorative test based on the Principal
Component Analysis (PCA). The chemometric analysis was performed by involving different
combinations of each type of powder and each type of solvent.
Abstract: SiC films were deposited by reactive DC magnetron sputtering of high purity (99.999%) Si target. 3 types of substrates, AISI M2 grade high speed steel, glass and Si (100) wafer were used in each deposition. The effect of different CH4 flow rates on the microstructural properties and surface morphologies were characterized by cross-sectional FE-SEM (Field-Emission Scanning Electron Microscope) observations. SIMS (Secondary Ion Mass Spectrometer) depth profile analysis showed that the elemental film composition was constant over the whole film depth. XRD (X-Ray Diffraction) results indicated that films were amorphous. Nanomechanical properties of SiC films were also investigated.
Abstract: The element added diamond-like carbon films (hydrogen, fluorine, and sulfur) fabricated
from C2H2:H2, C2H2:CF4 and C2H2:SF6 mixtures were used to study the effects of element contents
on the spin density (ESR) and their relation to the changes in the structure of the DLC films
deposited by PBII and RF-CVD method. The Raman spectroscopy was represented along with the
ESR. The results indicate that the ESR spin density and g value of H-DLC, F-DLC, and S-DLC
films deposited by PBII method decreases with element addition, attributed to the dangling bond
was strongly observed after element addition. The Raman G peak position shifts towards higher,
while the ID/IG intensity ratio increases with element addition and changes of bias voltage. For
H-DLC films deposited by RF-CVD method, the spin density and g value decreases, the G peak
shifts toward higher and ID/IG intensity ratio increases with hydrogen addition, that similar to
H-DLC films deposited by PBII method. The ID/IG intensity ratio increases with hydrogen addition,
indicating that the number of sp2 graphitic clusters of aromatic rings increases in the structure, and
the decrease of spin density is correlated to the increase of the paramagnetic centers in the
sp2-bonded graphite-like carbon structures, indicating to the spins originate mainly from the sp2
sites in the graphite-like carbon structures.
Abstract: Thermonuclear fusion is a potential source of cleaner and safer energy for the future. Its
technological realization depends on the development of materials able to survive and function in
extreme conditions, often involving a variety of loading – thermal, mechanical, chemical and
irradiation. Single bulk materials are often at the edge of their properties limits; therefore,
composites and coatings are intensely studied. This article reviews the development, characteristics
and applications of coatings for fusion reactor materials.
First, the technological objectives and material-environment interactions are briefly summarized,
together with materials requirements and the role of coatings. Then, specific applications in
different areas of a fusion device are reviewed, namely the plasma facing components, electrical
insulation, diffusion and permeation barriers. Various coating fabrication methods are mentioned
and the respective coating characteristics are compared. Selected case studies are presented, with
particular focus given to ITER and to ceramic coatings.