The Experts below are selected from a list of 4281 Experts worldwide ranked by ideXlab platform
W D Munz - One of the best experts on this subject based on the ideXlab platform.
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Wear associated with growth defects in combined cathodic arc unbalanced magnetron sputtered crn nbn superlattice coatings during erosion in alkaline slurry
Surface & Coatings Technology, 2000Co-Authors: H W Wang, Margaret Stack, S B Lyon, P E Hovsepian, W D MunzAbstract:The Erosive Wear associated with growth defects was studied in deaerated 0.5 M (Na2CO3-NaHCO3) buffer solutions containing 150-200 mum alumina particles on a rotating cylinder erosion-corrosion system for PVD CrN/NbN superlattice coatings grown by the are bond sputtering (ABS) process on mild steel BS6323. Corrosion was minimised by selective control of the sample's potential, according to potentiodynamic polarisation, during the slurry Erosive Wear test. The morphology of the coatings, particularly of the defects, was examined in planar and cross-section views by means of scanning electron microscopy before and after the test. It is found that Wear of the coating is typically preferential to the defects, progressing from the particle exterior top to the interior with erosion time, while the coating matrix (areas free of such defects) is largely intact, after 24 h prolonged exposure to erosion. (C) 2000 Elsevier Science B.V. All rights reserved.
H W Wang - One of the best experts on this subject based on the ideXlab platform.
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Wear associated with growth defects in combined cathodic arc unbalanced magnetron sputtered crn nbn superlattice coatings during erosion in alkaline slurry
Surface & Coatings Technology, 2000Co-Authors: H W Wang, Margaret Stack, S B Lyon, P E Hovsepian, W D MunzAbstract:The Erosive Wear associated with growth defects was studied in deaerated 0.5 M (Na2CO3-NaHCO3) buffer solutions containing 150-200 mum alumina particles on a rotating cylinder erosion-corrosion system for PVD CrN/NbN superlattice coatings grown by the are bond sputtering (ABS) process on mild steel BS6323. Corrosion was minimised by selective control of the sample's potential, according to potentiodynamic polarisation, during the slurry Erosive Wear test. The morphology of the coatings, particularly of the defects, was examined in planar and cross-section views by means of scanning electron microscopy before and after the test. It is found that Wear of the coating is typically preferential to the defects, progressing from the particle exterior top to the interior with erosion time, while the coating matrix (areas free of such defects) is largely intact, after 24 h prolonged exposure to erosion. (C) 2000 Elsevier Science B.V. All rights reserved.
S Kumaresh P Babu - One of the best experts on this subject based on the ideXlab platform.
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Erosive Wear behavior of high alloy cast iron and duplex stainless steel under mining conditions
Journal of Materials Engineering and Performance, 2015Co-Authors: J Yoganandh, S Natarajan, S Kumaresh P BabuAbstract:Centrifugal pumps used in the lignite mines encounter Erosive Wear problems, leading to a disastrous failure of the pump casings. This paper attempts to evaluate the Erosive Wear resistance of Ni-Hard 4, high-chromium iron, and Cast CD4MCu duplex stainless steel (DSS), for mining conditions. The prepared test coupons were subjected to an erosion test by varying the impingement velocity and the angle of impingement, under two different pH conditions of 3 and 7, which pertained to the mining conditions. XRD analysis was carried out to confirm the phases present in the alloy. The eroded surface was subjected to SEM analysis to identify the erosion mechanisms. The surface degradation of Ni-Hard 4 and high-chromium iron came from a low-angle abrasion with a grooving and plowing mechanism at a low angle of impingement. At normal impingement, deep indentations resulted in lips and crater formations, leading to degradation of the surface in a brittle manner. A combined extrusion-forging mechanism is observed in the CD4MCu DSS surface at all the impingement angles.
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Erosive Wear behavior of nickel based high alloy white cast iron under mining conditions using orthogonal array
Journal of Materials Engineering and Performance, 2013Co-Authors: J Yoganandh, S Natarajan, S Kumaresh P BabuAbstract:Nihard Grade-4, a nickel-bearing cast iron widely used in slurry pumps and hydrodynamic components, is evaluated for its Erosive Wear response under mining conditions using a statistical approach. Experiments were conducted by varying the factors namely velocity, slurry concentration, angle of impingement, and pH in three levels, using L9 orthogonal array. Analysis of variance was used to rank the factors influencing Erosive Wear. The results indicate that velocity is the most influencing factor followed by the angle of impingement, slurry concentration, and pH. Interaction effects of velocity, slurry concentration, angle of impingement, and pH on erosion rate have been discussed. Wear morphology was also studied using SEM characterization technique. At lower angle (30°) of impingement, the erosion of material is by micro fracture and shallow ploughing with the plastic deformation of the ductile austenitic matrix. At the normal angle (90°) of impingement, the material loss from the surface is found because of deep indentation, forming protruded lips which are removed by means of repeated impact of the erodent.
Tamer Sinmazcelik - One of the best experts on this subject based on the ideXlab platform.
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Erosive Wear Studies of Glass fiber- and Carbon Fiber-reinforced Polyetheretherketone Composites
2016Co-Authors: At Low Particle Speed, Tamer Sinmazcelik, Nejat Y. Sari, Taner YilmazAbstract:ABSTRACT: In this study, solid particle Erosive Wear behavior of randomly oriented short glass fiber and carbon fiber-reinforced polyetheretherketone (PEEK) composites was investigated. The solid particle erosion experiments were carried out at six different contact angles (15–908) and at low particle speed using brown fused aluminum oxide (Al2O3) particles (500–710mm) as an erodent. The PEEK composites showed semi-ductile erosion behavior, with a maximum Wear amount at a contact angle of 458. The fiber type and the contact angle had a significant influence on erosion behavior. Glass fiber-reinforced PEEK composites showed better Erosive Wear resistance than carbon fibre-reinforced composites. Scanning electron microscopy studies were conducted to understand the Wear mechanisms involved during the Erosive Wear. KEY WORDS: Erosive Wear, short fiber composites, polyetheretherketone compo-sites, scanning electron microscopy
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solid particle Erosive Wear behavior of glass mat reinforced pps composites influence of erodent particle size pressure particle impingement angle and velocity
Advances in Polymer Technology, 2013Co-Authors: Egemen Avcu, Tamer Sinmazcelik, Sinan Fidan, Mustafa Ozgur Bora, Onur Coban, Isa TaskiranAbstract:This study investigates solid particle Erosive Wear behavior of glass mat reinforced polyphenylene sulfide (PPS) matrix composites under various test parameters. PPS composite was manufactured by using the compression-molding process. Composite samples were eroded in a specially designed sandblasting system employing various parameters, and variation of the erosion rate was investigated. Samples were eroded at different erosion times, particle impingement angles, and under various pressures by using three different sizes of alumina particles. Impingement velocities of erodent particles were measured by using the double disk method. The results are also discussed regarding impingement velocity of the erodent particles. Glass mat reinforced PPS composites exhibited semiductile erosion behavior by showing a maximum erosion rate at 30° and 45° impingement angles. The erosion rate of the composite was increased with augmentation in erosion time, velocity, pressure, and particle size. Maximum erosion was observed when the composite was eroded after 10 s at 45° impingement angle under 4 bar pressure by using 60 mesh size erodent particles. The morphology of eroded surfaces was examined by using a scanning electron microscope, and possible Wear mechanisms were discussed. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E386–E398, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21286
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Erosive Wear studies of glass fiber and carbon fiber reinforced polyetheretherketone composites at low particle speed
Journal of Thermoplastic Composite Materials, 2011Co-Authors: Nejat Sari, Tamer Sinmazcelik, Taner YilmazAbstract:In this study, solid particle Erosive Wear behavior of randomly oriented short glass fiber and carbon fiber-reinforced polyetheretherketone (PEEK) composites was investigated. The solid particle erosion experiments were carried out at six different contact angles (15-908) and at low particle speed using brown fused aluminum oxide (Al2O3) particles (500-710mm) as an erodent. The PEEK composites showed semi- ductile erosion behavior, with a maximum Wear amount at a contact angle of 458. The fiber type and the contact angle had a significant influence on erosion behavior. Glass fiber-reinforced PEEK composites showed better Erosive Wear resistance than carbon fibre-reinforced composites. Scanning electron microscopy studies were conducted to understand the Wear mechanisms involved during the Erosive Wear.
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Erosive Wear behaviour of carbon fibre polyetherimide composites under low particle speed
Materials & Design, 2007Co-Authors: Nejat Sari, Tamer SinmazcelikAbstract:Abstract In this study, Erosive Wear behaviour of unidirectional carbon fibre reinforced polyetherimide (PEI) matrix composites was investigated with regards to the effects of contact speed, contact angles of particles and erosion period under low particle speed. Unidirectional carbon fibre reinforced PEI composites show semi-ductile behaviour under low speed Erosive studies. Highest Wear rates were investigated at 45° for 1.96 m/s and 50–55° for 2.88 m/s. Higher particle speed was found to be given higher Wear rates at higher peak contact angles compared to lower particle speed. Erosive Wear rates and the surface roughness have a close relationship with the contact angle of the erodent and speed. Higher particle speed resulted in rougher surface as a result of severe fibre breakage and matrix erosion.
S B Lyon - One of the best experts on this subject based on the ideXlab platform.
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Wear associated with growth defects in combined cathodic arc unbalanced magnetron sputtered crn nbn superlattice coatings during erosion in alkaline slurry
Surface & Coatings Technology, 2000Co-Authors: H W Wang, Margaret Stack, S B Lyon, P E Hovsepian, W D MunzAbstract:The Erosive Wear associated with growth defects was studied in deaerated 0.5 M (Na2CO3-NaHCO3) buffer solutions containing 150-200 mum alumina particles on a rotating cylinder erosion-corrosion system for PVD CrN/NbN superlattice coatings grown by the are bond sputtering (ABS) process on mild steel BS6323. Corrosion was minimised by selective control of the sample's potential, according to potentiodynamic polarisation, during the slurry Erosive Wear test. The morphology of the coatings, particularly of the defects, was examined in planar and cross-section views by means of scanning electron microscopy before and after the test. It is found that Wear of the coating is typically preferential to the defects, progressing from the particle exterior top to the interior with erosion time, while the coating matrix (areas free of such defects) is largely intact, after 24 h prolonged exposure to erosion. (C) 2000 Elsevier Science B.V. All rights reserved.