Plasma-sprayed Al₂O₃-TiB₂-SiC ternary composite coatings and its wear behaviour based on SiC content

Abstract

This paper aims to study the effect of adding different SiC content on the wear performance of Al 2 O 3 -TiB 2 -SiC ternary composite coatings produced by the air plasma spraying process. The study used SHS powders as primary materials, consisting of H 3 BO 3 , Al, and TiO 2 , and 5, 10, and 15 Vol.% SiC. The microstructure and wear specifications of the coatings were characterised using FESEM, microhardness, and pin-on-disk methods. The results showed that the addition of SiC led to higher hardness and lower wear track width and rate compared to Al 2 O 3 -TiB 2 composite coatings. The best wear behaviour was observed in Al 2 O 3 -TiB 2 -10%SiC and 15 wt% SiC composite coatings. The main wear mechanisms were found to be brittle fracture, delamination and adhesive for all samples.