engleski

THE EROSION OF AlN CERAMICS BY SAND PARTICLES

In this paper, erosion wear behavior of AlN ceramics is studied. The influence of particle hardness and shape on erosion of the AlN surface is examined. The effect of varying the impingement angle on the weight loss and changing roughness parameters of AlN ceramics testing sample is also determined. Therefore, erosive wear behavior of AlN ceramics was investigated using SiC and SiO2 particles as erodents, at following impact angles: 30°, 45°, 60°, 75° and 90°. Scanning electron microscopy (SEM) was used to analyze the eroded surfaces in order to determine erosion mechanisms. The roughness parameters (Ra, Rz and Rmax), before and after erosion with SiO2 and SiC particles at 30° and 90° angles of impingement, respectively, were determined using a profilometer. It was found that the impact angle is influencing the erosion wear of the AlN ceramics and maximum erosion takes place at impact angle of 90°. The results indicate that hard, angular SiC particles cause more damage than softer, more rounded SiO2 particles.

Solid particle erosion; Erosion mechanisms; AlN ceramics

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