Trtanium and its alloys are widely used in the aeronautical and chemica industries. This paper reports on an experimental investigation into the effect of boronising on wear behaviour in dry sliding. Boronising eliminates running-in wear, reduces oxidative (mild) wear, and increase the load at which transition to metallic (severe) wear occurs. The boro-nised layer has a considerable life, which is inversely related to applied load, and the surfaces remain protected even after the layer has been completely removed TE 99 通用摩擦磨損試驗機