Erosion by silicon carbide particles on hard coating deposited on steel

Erosion by solid particles in the coating of silicon carbide (SiC) substrates of AISI 304 stainless steel was analyzed. The specimens used were 25mm square and 3 mm thick, Silicon Carbide as abrasive particle 300-450 µm size was used. Experimental tests were performed on an apparatus developed in accordance with some parameters of the ASTM standard G76-95. Four angles of impact at 30°, 45°, 60° and 90 ° are contemplated with an approximate particle velocity of 25 ± 2 m / s with a maximum exposure time of 10 minutes per specimen, taking measurements of weight intervals 2 minutes to determine the loss of mass. The wear mechanisms were identified that these small angles were: Plastic deformation, displacement of material, plow mechanisms. While at higher angles they were present mainly: Cuttings, pitting, fractures and microcracks. It was observed that the rate of erosion depends on the angle of incidence of the abrasive particles.