Some reflections on the past and future of erosion

Solid particle erosion mechanisms of protective coatings for aerospace applications

“…This cutting model predicts quite well the angle of maximum erosion rate (ER) which is at the transition between cutting without particle immobilization and ploughing with immobilization at higher angles of incidence. In fact, it has been verified that experimental results are accurately predicted at low to moderate angles, but not at higher angles (θ > 40 o ) where the model significantly under-evaluates the material loss [53]. In more recent work, Finnie et al [54] found that the observed behavior at large angles of incidence could be explained by the dispersion of angles of incidence due to the increased surface roughness resulting from multiple particle impacts.…”

“…However, we do not believe this to be main reason for these low exponents. In fact, the models of erosion by ductile cutting of the surface predict a low exponent of 2 when no contribution from particle rotation is present [53]. In the case of normal particle impact, such as in the SPE tests conducted in this study, particle rotation is not expected to contribute significantly to surface cutting.…”

“…Finnie and McFadden [59] found that higher values of n are the result of particle rotation during impact. The resulting volume removed by a single particle can be expressed as [53]:…”

Slurry Erosion – Design of Test Devices

“…1). Degradation of materials due to slurry erosion depends on many factors, which can be divided onto three main groups: the first one connected with fluid flow conditions (flow velocity, angle of particle impingement, particles concentration, liquid density, liquid chemical activity, liquid temperature), the second one connected with solid particles (size, shape, hardness, strength) and the third one connected with target material (mechanical and endurance properties: toughness, fatigue, yield and ultimate strengths, work hardening, surface topography, microstructure, number and size of defects) [3,6,[9][10][11][12]. Thus, the numbers of factors influencing slurry erosion is very big and the degradation of materials is a synergic effect of all mentioned factors.…”

“…Since 1946, when the first technical papers on erosive wear were published [9], many investigation of material degradation due to slurry have been performed. In 1960 Finnie [10] published his pioneer work about slurry erosion, in which degradation mechanisms and theoretical analyses for predicting erosion damage were presented.…”