The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The architecture of erosion-resistant coatings is usually established empirically and their performance is evaluated experimentally through the measurement of minimum erosion loss. This makes it difficult to optimize the coating structure without a detailed knowledge of the damage mechanisms and the governing erosion parameters. In this context, the present work focuses on the use of advanced finite...
The gas-blast and centrifugal-accelerator testers are the two most commonly used erosion testers. An experimental and analytical study was made of the effect of particle characteristics (size, shape and concentration) on particle dynamics in each of these testers. Analysis showed that in the gas-blast tester both particle velocity and the dispersion angle of the particle jet were relatively sensitive...
Polystyrene–acrylonitrile mixed with different carbon nanotube (CNT) fractions has been successfully prepared by means of in situ polymerization method. The tribological behaviors of the nanocomposites are investigated by friction and wear tester under dry conditions. Compared with the polystyrene–acrylonitrile, polystyrene–acrylonitrile–CNTs shows not only the lower friction coefficient but also...
Solid particle erosion behavior of polyphenylene sulfide, reinforced by short glass fibers with varying fiber content (0–40wt%) has been studied. Steady-state erosion rates have been evaluated at different impact angles (15–90°) and impact velocities (25–66m/s) using silica sand particles (200±50μm) as an erodent. PPS and its composites exhibited maximum erosion rate at 30° impact angle indicating...
Models of the high speed impact of single particles on target materials allow an understanding of fundamental material removal mechanisms in solid particle erosion processes. A 2D finite element (FE) model of the impact of rigid rhomboid particles on a copper target was presented. The Lagrangian FE modelling of the impacts was shown to result in very large deformations and element distortion, even...
In the present study, the solid particle erosion behaviour of neat PEEK matrix and unidirectional glass fibre (GF) and carbon fibre (CF) reinforced polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) composites has been studied. The erosion experiments have been carried out by using silica sand particles (200±50μm) as an erodent. Steady state erosion rates of these composites have been evaluated...
Erosion–corrosion damage within pipelines and associated fluid handling equipment is prevalent in the oil and gas sector and other process industries where solid-laden flows, such as those involved in the processing of oil sands are found. As a first step towards trying to understand the interactions between erosion and corrosion it is important to understand the erosion damage that occurs as a result...
The solid particle erosion behaviour of fiber and particulate filled polymer composites has been reviewed. An overview of the problem of solid particle erosion was given with respect to the processes and modes during erosion with focus on polymer matrix composites. The new aspects in the experimental studies of erosion of fiber and particulate filled polymer composites were emphasised in this paper...
Solid particle erosion tests were conducted on four different types of silicon carbide ceramic composites. The composites are cotton fabric based Si/SiC with and without chemical vapour infiltration, fine teak wood powder based Si/SiC and coarse teak wood powder based Si/SiC. The erodents used are angular SiC particles of average size 80, 250 and 450μm. The velocities with which particles impacted...
It is a well-known fact that materials that consist of both brittle and ductile constituents can show erosion behavior in either a ductile or a brittle manner. The high-velocity oxy-fuel (HVOF) sprayed WC-Co/NiCrFeSiB coatings on GrA1 boiler tube steel exhibit composite ductile and brittle modes of erosion under angular silica sand erodent of size 125–180μm impacted at 40m/s. The HVOF spraying leads...
Metal-matrix/diamond-abrasive composites are commonly employed in precision grinding of glasses and ceramics. Erosion, to replace worn diamond cutting points, is essential to proper tool functioning. However, the erosion behavior of these materials has not been well characterized or understood. In this study, the results of experiments on bronze-matrix, diamond-abrasive composite tool materials are...
The threshold velocity for erosion of a ductile material is considered as the velocity required for initiation of plastic deformation in the substrate. For a brittle material, it defines the velocity required to nucleate a median crack in the elastic/plastic interface beneath the indentation. By invoking models for the solid particle erosion of ductile and brittle materials from the literature, together...
Cold remote oxygen nitrogen plasma (CRNOP) treatment was used to enhance reactivity of carbon fabric (CF) towards PEEK. The composite with treated fibers exhibited significantly better mechanical properties due to enhanced fiber–matrix adhesion as evidenced from SEM studies. It was of interest to examine the effect of the treatment on erosive wear performance with variation in angle of impingement...
The solid particle erosion behavior of detonation sprayed WC-12Co coatings obtained at three oxygen to fuel ratios has been characterized using SiC, Al 2 O 3 and SiO 2 as erodents at two impact velocities (25m/s, 45m/s) and two impact angles (30°, 90°). The results indicate that the erosion rate increases with increasing hardness of the erodent and more importantly, the erosion...
The SiC f /SiC ceramic matrix composites find applications in structural, wear resistance and high temperature applications as they are quite superior to their monolithic counter parts due to their improved flaw tolerance, large work of fracture and non-catastrophic failure behaviour. In this investigation, three types of SiC f /SiC composites, i.e., SiC f /SiC composite with...
The hard particle, erosion resistance of multi-layer, magnetron-sputtered, physical vapor deposited (PVD), titanium nitride/titanium (TiN/Ti) coatings for protection of AM355 steel turbine components was investigated. Multi-layer coatings, of 25μm total thickness, were deposited on AM355 substrates with variable numbers and thicknesses (equivalent to volume fractions) of the TiN and Ti layers. The...
Thermal barrier coatings (TBC) are used to protect hot path components of gas turbines from hot combustion gases. For a number of decades, in the case of aero engines TBCs are usually deposited by electron beam physical vapour deposition (EB-PVD). EB-PVD coatings have a columnar microstructure that guarantees high strain compliance and better solid particle erosion than PS TBCs. The main drawback...
The behaviour of four steels that are used in fluidized-bed boilers (16Mo3, T91, 304L and 253MA) has been studied in air (oxidation) and under impacts by sand particles in air (erosion–oxidation) at 350–650°C in an extensive test programme and their performance compared in terms of the resulting weight changes and surface appearances.The results show that the oxidation rates for the steels increase...
Repeated impact by solid particles causes erosion and degradation of engineering components. In internal combustion engines, during combustion, hot gases are generated in large quantity which causes erosion of cylinder, combustion chamber, exhaust system, etc. In this work, two types of plasma sprayed coating systems were developed on Al-6061 substrate. For each system, a systematic microstructural...
Smoothed particle hydrodynamics (SPH) was used to simulate the impact of single angular particles on Al6061-T6 targets, and the implications for solid particle erosion were discussed. The results of the simulations were verified by comparison to measurements obtained from impact experiments performed using a gas gun which was specifically designed to accelerate angular particles without disturbing...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.