Characterization, wear and emission properties of MnS containing laser cladded brake disc

Abstract

In this study, the laser cladding of gray cast iron brake discs using a Fe-based coating material was investigated. A 5 wt% MnS was added as a solid lubricant to the coating formulation to track the improvement of wear and emissions. Microstructural and tribological characteristics of the coated discs (with and without MnS) were studied comparatively. Three different friction materials, that are typically used for commercial brake pads, were adopted to evaluate the performance of the coatings. The pin on disc results indicated that, with the addition of MnS, both friction coefficient and wear rate have been reduced to levels comparable with those obtained in case of uncoated gray cast iron discs. The tribological behavior of MnS containing coating showed the best results when sliding against a Cu full friction material.