Erosive wear particle shape

Walker and Bodkin (1993) discuss the advantages and limitations of a number of the commonly used erosive wear testers. The influence of particle size and shape are very important as well as the impingement angle and concentration of the slurry. They found that the wear rate increases with the jet velocity to the power of 2.2 (Mens and de Gee (1986) gives 2.8-3.2.). Wear rate is at a maximum at 30° impingement angle. The mechanism is mainly cutting. The rate increases with the size of the particle. 

An example of how visual observation can assist in wear studies has been demonstrated in the erosion behavior of thermoplastics ( ). In the erosion of polymers the shape of the impinging particle on the polymer surface determines the mechanism by which wear occurs. 

Erosion resistance of materials is very dependent on the erosion conditions, the effects of which are dominated by a number of variables including particle size, shape, composition, and velocity angle of incidence and temperature. Unlike wear properties, the erosion rate of weld-overlay coatings generally increases with increasing hardness (Fig. 8). However, the erosion resistance of weld-overlay alloys depends on whether the... 

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