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Dhiman Chatterjee
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Dhiman Chatterjee
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Dhiman Chatterjee
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Chatterjee, Dhiman
Chatterjee, D.
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6 results
Now showing 1 - 6 of 6
- PublicationSlurry erosion wear resistance of polyurethane coatings with B4C Nano powders for hydroturbine applications(01-01-2013)
;Syamsundar, C.; ; Maiti, A. K.Hydropower generation from the Himalayan rivers in India face challenge in the form of silt-laden water. These sediments contain abrasive particles which can erode the turbine blades and reduce turbine life. This calls for the development of newer materials for turbine blade. To address this issue in the present investigation, 16Cr- 5Ni martensitic stainless steel has been selected and coated with polyurethane (PU) reinforced with boron carbide (B4C) nano particles to improve the wear resistance. With the increase of B4C content (0-2 wt %) in PU the mechanical properties and erosion wear resistance were investigated. The Shore hardness and pull off adhesion were found to increase with the increased content ofB4C nano particles and from contact angle measurement the coated surfaces are shown to be hydrophilic in nature. This condition reflects better wetting and may be good for cavitation wear resistance. Slurry erosive wear tests were done at various test conditions determined by Taguchi design of experiments of impact velocity, impingement angle, erodent size and slurry concentration. The erosion area of the PU coated samples were analyzed with scanning electron microscope (SEM) and the erosion wear mechanism is discussed Analysis of variance studies of erosion rate indicated that B4C content in PU material is the single most important parameter and interaction of impact velocity and impingement angle are proved to be significant Artificial Neural Network and Genetic Algorithm were employed to arrive at the worst possible scenario. - PublicationCombined silt and cavitation erosion resistance of nanoparticle reinforced polyurethane coatings on 16Cr-5Ni Martensitic stainless steel substrate(01-01-2019)
;Syamsundar, C.; Hydropower generation faces challenge in withdrawal of clean water from sand-laden rivers. This may lead to silt erosion and which, when compounded with cavitation-induced erosion of turbine blades, may lead to unexpected shutdowns. To address this issue, we have developed novel polyurethane (PU) coatings reinforced with boron carbide (B4C) or silicon carbide (SiC) nanoparticles on 16Cr-5Ni martensitic stainless steel substrate to improve resistance to silt and cavitation erosion. To the best of our understanding, the synergy between silt and cavitation erosion behaviors cannot be simulated with the available ASTM or non-standard test rigs. To overcome such shortcoming we developed a new test facility, where the submerged slurry jet impinges upon a stationary specimen, and focused ultrasonic transducer is used for cavitation erosion studies and this facility explores the possibility of synergetic effect of silt-cavitation erosion mechanisms. An interesting finding from the results is that there is an optimum amount of nanoparticles (20 wt.% B4C and 10 wt.% SiC) with respect to silt erosion and (10 wt.% B4C and 2 wt.% SiC) with respect to cavitation erosion, where mass removal is the minimum. Comparison of pure silt, pure cavitation and combine silt-cavitation erosion characteristics obtained using this experimental test facility, demonstrate enhanced erosion in case of combined silt-cavitation studies. This has been explained in terms of surface characteristics of coatings using scanning electron microscopy (SEM) images. - PublicationCavitation wear resistance of polyurethane coatings reinforced with SiC nanoparticles for hydraulic machinery applications(01-01-2014)
;Syamsundar, C.; ; Maiti, A. K. - PublicationExperimental Characterization of Silt Erosion of 16Cr–5Ni Steels and Prediction Using Artificial Neural Network(30-12-2015)
;Syamsundar, C.; Hydropower generation from the Himalayan rivers in India face challenge in the form of sand-laden water. These sediments contain abrasive particles which can erode the turbine blades and reduce turbine life. This calls for the development of newer materials for turbine blade. To address this issue in the present investigation, 16Cr–5Ni martensitic stainless steel has been selected. Silt erosive wear tests were done at various test conditions determined by Taguchi design of experiments of impact velocity, impingement angle, erodent size and silt concentration. Analysis of variance studies of erosion rate and roughness indicated that impact velocity is the single most important parameter and interaction of impact velocity and impingement angle are proved to be significant. The optimized artificial neural networks are finally used to estimate the erosion rate for different combinations of the test conditions in conjunction with optimization techniques like Genetic algorithm were employed to arrive at the worst possible scenario (impact velocity 20 m/s, impingement angle 30°, erodent size 245 µm and silt concentration 60 kg/m3). - PublicationErosion Characteristics of Nanoparticle-Reinforced Polyurethane Coatings on Stainless Steel Substrate(01-04-2015)
;Syamsundar, C.; ; Maiti, A. K.Hydropower generation from the Himalayan rivers in India faces challenge in the form of silt-laden water which can erode the turbine blades and reduce turbine life. To address this issue, polyurethane coatings reinforced with boron carbide (B4C) or silicon carbide (SiC) nanoparticles on 16Cr-5Ni martensitic stainless steel substrate were used in the present investigation to improve erosion wear resistance in silt erosion conditions. Slurry erosive wear tests were carried out based on ASTM G-73 protocol at various test conditions of impact velocity, impingement angle, and erodent particle size as well as slurry concentrations as determined by the implementation of Taguchi design of experiments. Analysis of variance studies of erosion rate indicated that nanoparticle content in PU material is the single most important parameter, and interaction of impact velocity and impingement angle was also proved to be significant. The coatings with B4C nanoparticles had higher wear resistances than those with SiC nanoparticles due to higher hardness of the former. An interesting finding from the results is that there is an optimum amount of nanoparticles at which mass removal is the minimum. This observation has been explained in terms of surface characteristics of coatings as brought out by a combination of measurements including SEM images as well as roughness measurement. - PublicationImproved resistance of nanoparticle-laden polymer coatings subjected to combined silt and cavitation(07-09-2018)
;Syamsundar, C.; Hydropower generation, particularly in the Himalayan region during monsoons, suffers because of the erosion of turbine components, which is due to the high concentration of silt present in water. These high-power machines also suffer from cavitation, especially at off-design conditions. However, erosion caused by the synergistic effects of silt and cavitation can cause more serious degradation, is more complex, and remains an unsolved problem in hydraulic machines. The present work addresses this concern through the systematic study of different polymeric coatings under a controlled silt and cavitation environment. This article discusses the design and development of an experimental facility, where a specimen can be subjected to combined submerged slurry jet along with acoustic cavitation produced by a focused ultrasonic transducer. Novel polymeric coatings made of polyurethane (PU) reinforced with hard nanoparticles (B4C and SiC) of varying concentrations (from 1 to 75 weight percentage [wt. %] being defined with respect to polymer weight) are used in this work. These coatings show erosion resistance superior to the base material (16Cr-5Ni martensitic stainless steel) commonly used to make hydroturbine blades. Results are divided into three divisions. At first, we present erosion kinetics and discuss possible erosion wear mechanisms based on pure silt erosion experiments. Afterwards, pure cavitation erosion and synergistic studies of silt and cavitation studies under different experimental conditions are presented. Base material showed the maximum mass loss rate of ∼22 mg/h, pure PU suffered ∼9 mg/h, while nanoparticle-reinforced PU (10 wt. % B4C or 2 wt. % SiC) has a loss of ∼1.5 mg/h. This shows the tremendous potential that this approach of using polymer laden with hard nanoparticles has in combating the synergetic effects of silt and erosion. The results are well-supported by detailed scanning electron microscope images and analyses to explain the reason behind the successful performance of the coatings.