Papers by Keyword: Nanocoating

Abstract: In this work, an aluminum oxide nanocoating was prepared using the pulsed laser deposition technique to study the properties of the coating and to find the optimal conditions to achieve the highest quality of the aluminum oxide nanocoating. The structural properties were studied using X-ray diffraction. The results showed that the aluminum oxide nanocoatings were alpha phase polycrystalline structures. The surface topography was studied using atomic force microscopy. The surface topography showed that the average surface roughness ranged from 1.26 nm to 7 nm. The optical properties were studied using a UV-VIS spectrometer. It showed the energy gap within the range 4.09 eV to 3.98 eV. The hardness of the aluminum oxide nanocoatings were calculated using the nanoindentation technique and found within the range of 32.79 GPa to 10.41 GPa. According to the present work, the effect of the input parameters represented by the pulse energy and the number of pulses on the responses represented by the energy gap, hardness, and surface roughness were studied. The experiments were designed based on the L9 orthogonal array with the Taguchi approach. A multiple responsive optimizations of Takeuchi's design was done using the desirability function.

Abstract: Heat resistant coatings are considered for the external surface Low-Pressure Steam Turbines (LPST). 410 stainless steel covered with nano heat resistant coatings consists of a heat resistant connecting layer enhanced by nanoparticles. A commercial paint was modified by using 20%wt of (titanium dioxide (TiO₂) - aluminum oxide (Al₂O₃)) with different concentrations range (25,50,75wt% of TiO₂) layers. These nano-coatings paints were airbrushed onto the surface of specimens of steam turbine blades. The test rig and experimental apparatus have been fabricated and collected to accomplish the thermal tests. The samples were subjected to heat resistance and a temperature test approximately similar to the steam turbine's operation condition temperature. The test results are used to choose the nano-coating layer with a concentration that ensures a composition's highest protective properties. The test sample with concentration (paint-(75% Al₂O₃+25% TiO₂)) showed the highest thermal properties compares with the other cases.

Abstract: The article discusses the effect of epilamated coatings during mandrelling. The picture of the change in contact stresses in the DEFORM-3D system is presented. It was established that a decrease in the coefficient of friction from 0.9 to 0.6 leads to a decrease in the number of foci and areas of contact stresses, as well as temperature analysis showed that a decrease in the friction forces reduces heat transfer in the cutting zone by about 40 ° C.

Abstract: The increasing level of paper consumption has the effect of cutting down trees for paper production which has disrupted natural sustainability. Paper production is not proportional to the amount of paper waste that is left to accumulate without recycle. Paper making material is 90% cellulose and the rest is material added as a support. This research try to recycle paper that processed chemically and cellulose isolating is by modifying it into nanoparticles with the addition of ZnO (nanosized) to produce nanocoating. Nanocoating production produces a nanocomposite coating solution with 0% and 1% cellulose + ZnO (nanosized) concentration (w/w cellulose). The result of this research can applied on salak fruit with parameters of weight loss and total acid. The parameters show changes in weight loss and total acid that will decrease every day with the coating treatment using cellulose, but the addition of ZnO (nanosized) can show the best results. The finding of this study could be used as extending the shelf life of fruit.

Abstract: Nanostructured coatings offer great potential for various applications due to their superior characteristics that are not typically found in conventional coatings. This research aimed at developing a new and improved coating that employs zinc oxide nanopowder as the agent to achieve corrosion resistant properties for a coating. The research project discusses on its corrosion behaviour of epoxy-zinc oxide in different media by measuring its corrosion rate. Mild carbon steel was used as the substrate for the epoxy-zinc oxide coating. The corrosion behavior mechanism of mild steel was investigated in different media, namely fresh water, NaCl solution, HCl solution and NaOH solution. Immersion test was conducted and studied for a period of 60 days, with daily and weekly weighing and immersing. The corrosion rate was calculated and mild steel corrodes in the different environment and degrades in the following trend; HCl → NaCl → NaOH → H₂O.

Abstract: In this paper, we propose and experiment the application of self-cleaning Nano coating on solar panels. We have measured an important increase of water droplet contact angle on a Nano coated surface. We found beneficial effects on light transmittance and Open Circuit Voltage (Voc) for the photovoltaic modules. Experimentally, we have shown a higher Transmission coefficient (T) in case of treated glass. In addition, from Thermal Camera analysis, we have shown that the Nano coated Photovoltaic module became cooler and cleaner comparatively to untreated module.

Abstract: The main objective of this paper is to offer ion-plasma technology for production of Ti (titanium) and titanium nitride (TiN) erosion-resistant nanocoatings for the machine building products, which ensures the coatings with optimum and stable properties. As a result of experiments and processing experimental data the optimum composition of ion-plasma titanium and titanium nitride nanocoatings was obtained and offered.The approbation of the developed technology on the existing machine building products (compressor blade of the helicopter gas turbine; base material: Incoloy 800) was carried out. The comparative study on the influence of the coating on the surface quality, coefficient of friction, adhesion strength and erosion resistance was done. For evaluation of the obtained nanocoating surface’s quality 2D and 3D surface description approaches were applied. Achieved results prove the effectiveness of offered ion-plasma technology for production of titanium and titanium nitride erosion-resistant nanocoatings with appropriate and stable properties.

Abstract: The preservation ability of coatings applied to the materials of steel products, steel structures, etc., for short-term corrosion protection is a very delicate and modern theme. In cooperation with the project Pre-seed, we can pay closer attention to activities involved with this topic. The project Pre-seed at the Technical University of Ostrava, which is part of the Operational Programme of Research and Development for Innovation, attempts to support the preparation of the commercialization of promising technologies and inventions with high application potential that were developed at the Technical University of Ostrava. This paper focuses on the short-term corrosion protection of steel products, steel structures, and engineering products using thin nanocoatings. This experimental work is primarily concerned with the production and development of samples that demonstrate the innovativeness and functionality of the issue. Furthermore, the project addresses important factors affecting the quality and durability of the coating system. The results of the experimental part show us some very interesting outputs that need to be further studied and developed.

Abstract: Forming limit diagram presents limit strains for different linear strain paths. In other words it indicates localized formability of sheet metals under different proportional loading and is considered a powerful tool for trouble shooting in sheet-metal forming industries. In this study in-plane and out-of-plane forming limit diagrams were determined for aluminum 5052. In the experimental works, all specimens were prepared in the rolling direction and annealed before testing. Forming up to fracture was carried out on INSTRON UTM with a tensile force of 1N. The sheet samples were subjected to tension-compression state of strain by varying the notch sizes of the samples. FLD was drawn by plotting the minor strain in abscissa and corresponding major strain in ordinate and by drawing a curve which separates the safe region from the unsafe region.

Abstract: Now a days the global warming and air pollution are big issue in the world. The more amount of air pollution is due to emissions from an internal combustion engine. Catalytic converter plays a vital role in reducing harmful gases. In this study, the nanocoated catalytic converter efficiency was focused. The flow area of catalytic converter plays a vital role in the conversion of the harmful gases NOx, CO & UHC. The wire mesh coated with Alumina and Ti02 was the conversion medium. By varying the length of the wire mesh, the flow area was changed. The length of the wire mesh substrate was varied by 100mm, 150mm and 200mm. It was experimentally found that the increase in flow area reduces the exhaust emissions smoke, CO, HC and NO_x.