Novel Al-based Self-lubricating Wear-resistant Coatings by Low Pressure Cold Spray

Abstract

To improve the wear resistance of Al coating, the Al-based self-lubricating wear-resistance coatings were fabricated by Low pressure cold spray(LPCS) technology onto Q235 carbon steel. The right amount of hard phase(Al2O3) and a lubricant(MoS2) were added to improve the wear resistance of the nonvel coating. The friction and wear behaviour were carried out using the UMT-3 fricition and wear tester by line-contact reciprocating sliding. The microstructure of coating and corresponding wear traces of these novel Al-based self-lubricating wear-resistant coatings were investigated by means of scanning electron microscopy (SEM), with the energy dispersive spectrum (EDS). The results showed that the average friction coefficient and the weight loss of the novel Al-based composite coatings with the contents of 5wt% MoS2 is lower than Al-Al2O3 composite coating. The novel Al-based composite coating showed an improved wear resistance and the wear mechanism was abrasive and adhesive wear.