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.
In this study, the resistance of alloys and composites based on the intermetallic compounds Fe 3 Al and FeAl to wear by hard particles was assessed and compared to the behavior of selected metals, alloys, other intermetallic compounds and ceramics. Pin abrasion tests were performed on these materials at room temperature. Among other things, it was found that as the Al atomic percent in binary...
The erosive wear behaviour of glass fibre (GF) reinforced thermoplastic polypropylene (PP) composites was studied in a modified sandblasting apparatus as a function of the impact angle (30, 60 and 90 o ), relative fibre-orientation (parallel Pa and perpendicular Pe), fibre length (discontinuous, continuous) and fibre content (40-60wt.%).The results showed a strong dependence of the erosive...
The solid particle erosion behaviour of unidirectional carbon fibre (CF) reinforced polyetheretherketone (PEEK) composites has been characterised. The erosion rates of these composites have been evaluated at different impingement angles (15-90 o ) and at three different fibre orientations (0, 45, and 90 o ). The particles used for the erosion measurements were steel balls with diameter...
Two types of solid particle erosion are often distinguished: brittle erosion and ductile erosion. In the first case, material is removed by crack formation (maximum erosion at 90 o impact angle), in the latter case by cutting and ploughing (maximum erosion around 30 o impact angle). When very low particle kinetic energies are used to erode brittle targets, the impacts are not powerful...
A micro-scale dynamic model (MSDM) was applied to simulate solid particle erosion. In this model, the target material and solid particles are discretized and mapped onto a square grid or lattice. Each lattice site represents a small volume of the materials. During an erosion process, a lattice site may move under the influence of external force and the interaction between the site and its adjacent...
In a companion paper [Simulation of interference effects in particle streams following impact with a flat surface. Part I. Theory and analysis, submitted for publication], a computer simulation capable of describing the interference between an incident stream of spheres and those rebounding from a flat surface was presented. In the present paper, the model is used to study the effect of the following...
The interference between an incident stream of spheres and those rebounding from a flat surface is described using a computer model. The model was capable of examining the effect of the following parameters on the severity and frequency of inter-particle collisions: stream angle of incidence, nozzle divergence angle, incident particle velocity and flux, particle size, particle-particle and particle-surface...
The solid particle erosion behaviour of various polyaryletherketones (PAEKs) and their short fibre reinforced composites has been characterised. The erosion rates (ERs) of these composites have been evaluated at different impingement angles and impact velocities. Silica sand particles of size ranging between 150 and 212μm were used as erodent. Neat polyetheretherketone (PEEK) and 20% glass fibre (GF)...
Mechanical properties are important for infrared (IR) windows that may suffer from erosion damage during service. Zinc sulfide is a typical IR material that provides high transparency and satisfactory mechanical properties. Chemical vapor deposition, capable of producing large, complex shaped deposits with high purity, density, is commonly used to deposit IR materials. The substrate temperature determines...
Under the leadership of the late Prof. Philip Bowden, the PCS Group in the Cavendish developed an interest in the erosion damage caused by the impact of raindrops on high-speed aircraft and missiles in the late 1950s. However, although John Field took some classic high-speed photographic sequences of solid particle impact damage on glass in the early 1960s, material removal mechanisms caused by solid...
The trajectory of an angular particle as it cuts a ductile target is, in general, complicated because of its dependence not only on particle shape, but also on particle orientation at the initial instant of impact. This orientation dependence has also made experimental measurement of impact parameters of single angular particles very difficult, resulting in a relatively small amount of available experimental...
Prediction of erosion in flow systems requires an understanding of the complex interactions between the fluid and the solids. The complexity of the problem increases significantly in multiphase flow due to the existence of different flow patterns. Earlier predictive methods for erosion in multiphase flow were primarily based on empirical data and the applicability of those models was limited to the...
The high hardness of boron carbide (B 13 C 2 ) and diamond make them attractive candidates for use as erosion- and abrasion-resistant coatings in applications such as valves and pumps used in the off-shore oil industry. This paper compares the dominant solid particle erosion mechanisms of boron carbide and diamond coatings produced by chemical vapour deposition (CVD), when subjected...
In the present investigation NiCrAlY, Ni-20Cr and Ni 3 Al metallic coatings were deposited on a Ni-based superalloy (18.5Fe-19Cr-0.15Cu-0.5Al-3.05Mo-0.18Mn-0.9Ti-0.18S-0.04C-5.13 (Ta+Cb)-balance Ni). NiCrAlY was used as bond coat in all the cases. Erosion studies were conducted on uncoated as well as plasma spray coated superalloy specimens at room temperature. The erosion experiments were...
The erosion behaviours of the nodular and gray cast irons were studied at an intermediate and normal impact angles via an experimental setup. Erosion tests were carried out at impact angles of 30°, 60° and 90° using angular hard particles. The particle velocity was controlled utilizing the gas pressure and was measured with rotating double discs. The results showed considerable weight loss variation...
The solid particle erosion on the control stage nozzle of supercritical steam turbines can be reduced by using suitable nozzle passage design to control the particle impacting velocity and impacting angle. In this paper, two nozzle designs with tip endwall contouring/an aft-loaded vane profile respectively are presented. Furthermore, anti-erosion performances of these two nozzles for a supercritical...
A finite element methodology was developed to investigate tensile stresses in the surface of multilayered coatings under single particle impact, simulating particulate erosion conditions. Eight different coating architectures were analyzed to determine reduction in tensile stresses obtained through a combination of layering patterns and material property selections. Depending on actual layer configuration...
The present investigation reports about, the solid particle erosion behaviour of randomly oriented short E-glass, carbon fibre and solid lubricants (PTFE, graphite, MoS 2 ) filled polyetherimide (PEI) composites. The erosion rates (ERs) of these composites have been evaluated at different impingement angles (15–90°) and impact velocities (30–88m/s). Mechanical properties such as tensile strength...
Analytical models by Andrews and Horsfield and Anand et al. that describe interference between a non-diverging incident stream of spherical particles and those rebounding from a flat surface were modified to include a larger scope of stream variables, such as radial symmetry, stream density, and a more complex rebound geometry incorporating coefficients of restitution and friction. Expressions for...
The fundamental erosion rate of polymethylmethacrylate (PMMA) was measured with a stream of 25μm Al 2 O 3 particles as a function of impact angle. The erosion rate was maximum at around 25° relative to the surface, suggesting a ductile erosion mechanism. Using these erosion rate data, an existing model for predicting the surface profile evolution due to abrasive jet micromachining...
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.