The effect of SiC reinforcement on tribological behaviour of cold sprayed coatings in water

Abstract

In this study, structural characteristics and tribological performance of the coatings deposited on a 1050 quality aluminium substrate by cold spraying of the feedstock consisting of 100% Al-12Si and 25 vol.% SiC + 75 vol.% Al-12Si powders were examined. Wear tests were conducted in air and in water against alumina ball under loads of 1 and 5 N by a reciprocating wear tester at room temperature. Presence of SiC particles in the structure enhanced the wear resistance of the Al-12Si coating both in air and water. As compared to the air testing condition, water containing media provided better tribological performance especially at the wear test load of 1 N. The findings of this study revealed potentiality of water to be used as a lubricant for SiCreinforced Al-12Si matrix cold spray composite coatings at relatively low wear test loads. This is part of a special issue featuring papers based on presentations given at the TurkeyTrib'15 Conference, which have been revised and extended before inclusion in Tribology -Materials, Surfaces & Interfaces.

Study on distribution uniformity of hard phases in composite coating

“…With updates and an optimization of cold-spraying equipment, research results have been published on ceramic coatings, such as WC [6], TiO 2 [7,8], and SiC [9][10][11]. Hard-phase aluminium-based composite coatings can be prepared by adding ceramic particles to aluminium-based coating, which can avoid harmful interface reactions and enhance phase utilization [12].…”

“…In cold spraying, ceramic particles can tamp metal materials, to prepare the Al–Al 2 O 3 composite coating with a higher hardness and less porosity [16,17]. Simultaneously, Al–SiC composite coatings also had a denser organization [9]. The coating could not be deposited when metal Al and Al 2 O 3 were sprayed separately on a steel matrix, but a coating was obtained when a mixed powder was sprayed, and the deposition efficiency exceeded 50% [18].…”