Abstract
Machining tests were carried out on hardened AISI H13 hot-work steel (HRC 43–48) using a series of different ceramic tools, i.e. SiC whiskerreinforced alumina, SiAlON, alumina, mixed alumina and cubic boron nitride (CBN). The wear behaviour and wear mechanisms of the tools are discussed. Significant differences in tool life were noticed between the different ceramic tools under the same cutting conditions. It was found that the tool life was limited mainly by crater wear when using SiAlON, whiskerreinforced alumina and CBN. Alumina-based ceramic tools showed superior crater wear resistance. Whisker-reinforced alumina tools showed microfracture during cratering. CBN tools revealed evidence of diffusion wear.
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