Phase characterization of debris generated in brake pad coefficient of friction tests

▶ Magnetite in low speed as opposed to cementite formation in high speed COF tests. ▶ Erratic COF correlates with presence of cementite in debris and pad surface. ▶ Complex phase composition possibly hides presence of relevant phases in XRD. ▶ Relevance of Mössbauer spectroscopy in tribo-couples involving cast iron.