Tribological Behaviour of Plasma Sprayed Redmud-Flyash Coatings

Abstract

Plasma sprayed composite coatings are widely used as wear resistant coatings on a variety of metallic substrates. In spite of all advantages this process finds limited applications due to the high cost of the spray grade powders. The present investigation deals with wear behavior of a 300-micrometer thick coating deposited on Al substrate by Atmospheric Plasma Spraying (APS). The coating material employed are, two abundantly available industrial wastes, redmud and flyash mixed in a ratio of 2:1. Wear test were carried out under applied normal force of 15 N, with three different sliding speeds 0.5, 1.0 and 1.5 m/sec and at atmospheric condition ( 250 C, 60%RH) using a pin-on-disc tribometer.