Materials Literature
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We have detected type I collagen in mural paintings excavated from the underground burial chamber of Idout in the Saqqara region of Egypt. Proteins extracted from the debris of wall paintings were separated by gel-electrophoresis, digested by trypsin, and analyzed by matrix-assisted laser desorption/ionization mass sp…
Dans cette étude, on s'est intéressé à la modélisation réduite et au contrôle d’organes intervenant dans la réduction des émissions de polluants des véhicules automobiles à basse consommation. Il s’agit des réacteurs catalysés de type « piège à NOx » et SCR, utilisés dans les architectures de post-traitement des gaz d…
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
It was found in this study that air plasma treatment of particular kaolinite has led to the change of its wettability. This was reflected in the decreased values of water contact angles of wetting. There were determined yield locus and flow function dependencies at different stress levels for virgin and different time…
Air Plasma Sprayed (APS) Ceria Stabilized Zirconia (CSZ) coatings have been extensively used as alternative material yo Yttria Stabilized Zirconia (YSZ) in the gas turbine industries due to the good mechanical properties and hot corrosion resistance at an elavated temperatures. Due to the high velocity and temperature…
This paper presents the changes in corrosion resistance of SiO2 coatings generated in the plasma process PECVD (Plasma Enhanced Chemical Vapour Deposition), using RF plasma (13.56 MHz), under the influence of the introduction of nitrogen to their volume. Two magnesium alloys AZ32 and AZ91 were put under the tests. On…
Thermal barrier coatings (TBCs) are widely-used as protective and insulative coatings on hot section components of gas turbines and their applications, like blades and combustion chambers, power generation. TBCs are used to allow higher service temperatures hot section of turbines and thus higher turbine efficiencies.…
To produce functional elements for optical applications, the components often have to be coated or joined together. Low adhesion is usually caused by different polarity or surface chemistry of the individual components. Therefore, measures have to be taken to modify the respective interfaces to improve the adhesion. I…
We present a study of the influence of the substrate nano-structure and composition on the morphological properties of the carbon nanotubes (CNTs) by sequentially growing in situ TiNx:Oy film, dispersed nickel catalyst particles, and CNTs obtained by CVD. The results show that the stoichiometry and the nanostructures…
To remove brass plating on fine saw wire, line-shaped magnetron plasma source has been newly developed. New type of multiple plasma sources has been developed by applying to multiple-triangle-type electrodes. The stripping effects were successfully established by using high density magnetron source with 20mm gap in an…
Hydrogen free diamond-like carbon coatings (DLC), i.e. tetrahedral amorphous carbon (ta-C) films, have high hardness and low coefficient of friction at ambient temperature and humid conditions. However, the coefficient of friction and wear rate in sliding contacts against steel surfaces increase severely at elevated t…
A facile, mass production amenable, rapid method for making superamphiphobic / amphiphobic surfaces by random plasma nanotexturing of polymers in plasmas is presented. Plasma etched and simultaneously randomly roughened (nanotextured) polymethylmethacrylate (PMMA) Polyether-ether-ketone (PEEK), Cyclic-olefin-copolymer…
The texturing of surfaces is an important method applied in various technological areas of research. Much of the current interest on surface modifications stems from the possibility of obtaining special optical, magnetic, tribological, and mechanical properties in a variety of materials. The texturization of steel sur…
The study of the chemical erosion by atomic hydrogen of graphite in the purpose of characterizing etching and re deposition growth kinetics is presented. Carbon samples undergo plasma treatment under different time-exposures and gas mixtures at 10 mTorr, determined as the optimal pressure. The etching outcomes are ana…
The increased focus on the natural environment protection, the increasing fuel prices and the will to reduce the costs of machines’ maintenance - all that obliges us to search for innovative engineering solutions that would both limit the use of conventional lubricants and enhance the machines’ efficiency. To fulfil t…
Residual compressive stresses can be induced into a PVD film up to a certain depth from the coating surface via micro-blasting. Depending on the micro-blasting conditions, the deformed film depth varies, thus affecting the coatings performance in different applications. A method has been already introduced for determi…
The hydrophilization treatment of polyimide is important in various applications. This paper has described the experimental research findings which explore what the parameter with large effect in the plasma treatment of polyimide is. The low pressure surface wave plasma of the argon oxygen mixed gas which can expect l…
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We have designed and implemented a hierarchical simulation methodology capable of addressing the growth rate and microstructural features of thin silicon films deposited through PECVD (Plasma Enhanced Chemical Vapor Deposition). Our main objective is to elucidate the microscopic mechanisms as well as the interplay bet…
Quaternary TiZrAlN films are: • perspective for both oxidation and wear resistance applications and expectant substitution for TiN, (Ti,Al)N and (Ti,Zr)N hard films; • capable to possess by the unique properties due to possibility of nanocomposite structure formation during their synthesis. The aim of the present work…