MODELLING AND ANALYSIS OF WEAR FOR VAPOUR DEPOSITION COATINGS

Abstract

Wear takes place where any two contacting rubbing surfaces found. To prevent wear Coatings on the surface are deposited. In this study an attempt is made to find out the standard wear (dimensionless constant) coefficient which is a very crucial factor decides the amount of volume loss for particular contacting surfaces under a given load, sliding distance and sliding velocity as proposed by Archard. On pin on disc apparatus test is performed to find out the volume loss for Cast iron and chromium nitride coating with load (50, 60,70,80,90,100 N) at sliding velocities (1, 2, 3m/s) for a constant sliding distance of 2500m. Variation of standard wear coefficient with volume loss is represented at different sliding velocities for both Cast iron and chromium nitride coating. The results show a decreasing trend for standard wear coefficient with volume loss when load is kept increasing and sliding velocities are kept constant at 1m/s, 2m/s, 3m/s. It shows a good agreement with the model as the ratio of volume/load decreases thereby decreasing the standard wear coefficient. An average standard wear coefficient value is obtained by taking the average of standard coefficient values at different velocities. Plot between average standard coefficient and load shows a decreasing trend which is a good agreement with the model.