Abstract
Scratch tests have been performed on polished surfaces of eight SiC-based engineering ceramics, a Roctec material (cemented carbide containing no metallic phase) and a tool steel, under steadily increasing normal loads up to 100 N. The scratches were made with a Rockwell C diamond indenter and both the normal load and the tangential force were continuously recorded during scratching. The material's response was investigated by measuring the fluctuations in the tangential force during scratching and also by scanning electron microscopy (SEM) of the scratches. The materials responded very differently to scratching; all the ceramics exhibited both plastic and brittle behaviour, to different extents. The occurrence of fracture on the sample surfaces was correlated with fluctuations in the tangential force, and the tangential force record was shown to provide a valuable and simple method for identifying the occurrence of transitions in deformation mode.
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