Performance of different coating materials against slurry erosion failure in hydrodynamic turbines: A review

Prashar, Gaurav; Vasudev, Hitesh; Thakur, Lalit

doi:10.1016/j.engfailanal.2020.104622

Cited by 66 publications

(22 citation statements)

References 106 publications

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“…Since 1988, hard PVD coatings have been investigated as the protective coatings against solid particle erosion [105,106]. Among many test devices, very popular are the solid particle jet and slurry pot devices [49,107]. Unlike devices for cavitation erosion testing, many devices are designed to meet the individual needs of researchers.…”

Section: Resistance Of Pvd Coatings To Solid Particle Erosionmentioning

confidence: 99%

Resistance of PVD Coatings to Erosive and Wear Processes: A Review

Krella

2020

Coatings

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Due to the increasing maintenance costs of hydraulic machines related to the damages caused by cavitation erosion and/or erosion of solid particles, as well as in tribological connections, surface protection of these components is very important. Up to now, numerous investigations of resistance of coatings, mainly nitride coatings, such as CrN, TiN, TiCN, (Ti,Cr)N coatings and multilayer TiN/Ti, ZrN/CrN and TN/(Ti,Al)N coatings, produced by physical vapor deposition (PVD) method using different techniques of deposition, such as magnetron sputtering, arc evaporation or ion plating, to cavitation erosion, solid particle erosion and wear have been made. The results of these investigations, degradation processes and main test devices used are presented in this paper. An effect of deposition of mono- and multi-layer PVD coatings on duration of incubation period, cumulative weight loss and erosion rate, as well as on wear rate and coefficient of friction in tribological tests is discussed. It is shown that PVD coating does not always provide extended incubation time and/or improved resistance to mentioned types of damage. The influence of structure, hardness, residence to plastic deformation and stresses in the coatings on erosion and wear resistance is discussed. In the case of cavitation erosion and solid particle erosion, a limit value of the ratio of hardness (H) to Young’s modulus (E) exists at which the best resistance is gained. In the case of tribological tests, the higher the H/E ratio and the lower the coefficient of friction, the lower the wear rate, but there are also many exceptions.

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Section: Resistance Of Pvd Coatings To Solid Particle Erosionmentioning

confidence: 99%

Resistance of PVD Coatings to Erosive and Wear Processes: A Review

Krella

2020

Coatings

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“…Gradients of physical and mechanical properties between the substrate and the coating might produce failures, e.g., crack initiation and propagation, or reduction of corrosion and creep resistance [34][35][36]. It must be noted that thermal stresses are generated during cooling after fabrication [37] and that cracking within coatings can be caused also by thermal cycles in the absence of mechanical loading [38]; in addition, coating oxidation must be taken into account [4,10,39,40].…”

Section: Testing Of Coatingsmentioning

confidence: 99%

Influence of Atmospheric Plasma Spray Parameters (APS) on the Mechanical Properties of Ni-Al Coatings on Aluminum Alloy Substrate

Lorenzo-Bañuelos

Díaz

Rodriguez³

et al. 2021

Metals

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Thermal spray is one of the most widely used coating techniques to improve wear, surface fatigue or corrosion properties. In the atmospheric plasma spray (APS) process, a powdered material is melted by hydrogen and argon combustion and is propelled at high speed onto the target substrate. The high impact energy of the particles produces a dense and resistant coating layer. Mechanical and surface properties of the obtained coating depend on various spraying parameters, such as gas flow, traverse speed and spraying distance, among others. In this research, the influence of these manufacturing parameters on the thickness, hardness and resistance of the coating obtained from a Ni-Al alloy sprayed onto an aluminum alloy substrate was studied. In order to analyze the effect of these parameters on the coating properties, an extensive experimental program was carried out. A metallographic analysis, hardness and strength measurements were carried out using the small punch test to locally study the mechanical properties of the coating surface. The design of experiments and the response surface methodology facilitate the assessment of the optimal set of spraying parameters.

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“…Brekke [3] divided the wear of the guide vane into turbulence erosion, secondary flow erosion, leakage erosion, and erosion due to acceleration according to the flow characteristics. To reduce the loss caused by wear to hydropower plants and pump stations, many scholars have studied wear mechanisms [5,6] and wear-protection technology for hydraulic machinery. Aponte [7] and Jing [8], respectively, adopted the design-optimization method to reduce the damage of sediment to the flow component of a hydro-turbine and pump from the aspect of hydraulic design.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Solid–Liquid Two-Phase Flow around a NACA0012 Cascade in Sediment-Laden Flow

et al. 2022

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Sediment abrasion may cause the removal of material and efficiency loss to hydraulic machinery (hydro-turbine, pump, etc.), which may worsen the internal flow and endanger the safe operation of the machines. As abrasion is caused by the impact of sediment on the solid surface, the movement of particles determines the wear intensity. To understand the wear mechanism of hydraulic machinery, the motion characteristics of the asymmetric solid–liquid two-phase flow in a sediment-laden flow around NACA0012 cascades were studied. The laser particle imaging velocimetry (PIV) method was used to measure the flow of quartz particles with median diameters d50 of 82.7 μm, 65.9 μm, and 31.8 μm near the wall of cascades at an impact angle of 10° in a Venturi circuit. The flow characteristics and velocity slip between solid and liquid phases, as well as the effects of particle size and the Reynolds number on velocity slip, were analyzed. The results showed that: (1) the flow is asymmetrically distributed in front of the cascade’s leading edge at a 10° impact angle, and there is strong velocity slip between solid and liquid phases; (2) under the influence of particle inertia, the velocity of the solid phase is higher than that of the liquid phase in the deceleration stage, while the velocity of the solid phase is lower than that of liquid phase in the acceleration stage; (3) in the process of approaching the leading edge, the velocity difference between the solid and liquid phase increases by about 10% and the angle difference increases by about 8.8°.

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Performance of different coating materials against slurry erosion failure in hydrodynamic turbines: A review

Cited by 66 publications

References 106 publications

Resistance of PVD Coatings to Erosive and Wear Processes: A Review

Resistance of PVD Coatings to Erosive and Wear Processes: A Review

Influence of Atmospheric Plasma Spray Parameters (APS) on the Mechanical Properties of Ni-Al Coatings on Aluminum Alloy Substrate

Asymmetric Solid–Liquid Two-Phase Flow around a NACA0012 Cascade in Sediment-Laden Flow

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