It Was Found That For Metals,alloys and ceramics an increase of the particle concentrations lead to decrease of erosion rate. Anand et al. [3] measured the erosion rate as a function of erodent particle flux by using an airstream system A significant decrease in erosion rate was observed with the flux increasing the erosion rate varied approximately as an exponential decay with the particle flux. and the effects was more pronounced for small particles and low particle velocities.