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Abstract
Abstract Four commercially available Si 3 N 4 materials were eroded with SiC and quartz particles over a wide range of particle sizes (8 – 10 μm) at subsonic velocities. The target materials encompassed a broad range of mechanical properties and microstructures. Erosion weight loss was measured and the erosion dependences on particle size and velocity were determined. Single impacts were examined to characterize the damage. All the targets eroded with SiC particles exhibited an elastic-plastic type of impact damage. This type of damage is characterized by a highly deformed impact crater with radial and lateral cracks propagating outward from the impact crater. The damage for quartz particle impact varied from an elastic-plastic type to minor intergranular chipping for the harder higher fracture toughness targets. The type of erosion damage was more dependent on relative target-particle properties than on particle size and velocity. The experimental erosion data are compared with the two models developed for elastic-plastic impact damage which are based on single impacts on isotropie targets under idealized conditions.
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