TiB2 embedded borosilicate coatings with improved wear resistance

Abstract

State-of-the-art abrasion resistance of glass ceramic coatings (GCCs) is set by dense, low closed porosity, defect- and micro-stress-free microstructure since GCCs have low fracture toughness. Titanium diboride (TiB2) is a ceramic material with relatively high strength and durability as characterized by the high melting point, hardness, and wear resistance. In this study, the effect of mill additive TiB2 hard ceramic particles (HCP) on GCCs was investigated. The precursor glass ceramic system of SiO2-Na2O-B2O3-CaO-Fe2O3 was selected. The wear resistance of the GCCs was tested simultaneously by Taber Abraser and by a tribometer. B2O3, which is formed by the oxidation of TiB2, fills the pores and the microcracks on the surface, thus reducing the stress areas and increasing the wear resistance. Increasing the TiB2 HCP addition yielded a decrease in mass loss of about 81%, wear rate of about 82% and increase in the coefficient of friction of 15%.