Effect of Some Processing Parameters on Arc Sprayed Coating

Abstract

In this work, arc spray coating of 13% Cr-steel (BS403S17) has been used in repair of nodular cast iron journals. This study discusses the processing factors effecting the roughness, hardness,and wear resistance of coating produced by arc spraying. The studied factors are applied voltage, wire feed rate, spraying distance (distance between gun nozzle and substrate) and coating thickness. All coated samples were tested using pin on ring wear testing machine. The final results showed that the best voltage in this application is between 28 and 30 V. With this voltage a reduction in wear rate of about 8% can be obtained. The research reveals that the wear rate decreases by 46% with increasing in wire feed rate from 68 to 122 mm/s and it is found that the best spraying distance is about 10 to15 cm to get a good coating surfaces with reduction by about 58% in wear rate. It is also approved that coating thickness has positive effect on reducing wear rate by 43%.