Preparation of Al₂O₃/Ti(C,N)/ZrO₂/CaF₂@Al(OH)₃ Ceramic Tools and Cutting Performance in Turning

Aiming at the contradiction between the lubricating performance and mechanical performance of self-lubricating ceramic tools. CaF₂@Al(OH)₃ particles were prepared by the heterogeneous nucleation method. An Al₂O₃/Ti(C,N) ceramic tool with CaF₂@Al₂(OH)₃ particles and ZrO₂ whiskers was prepared by hot press sintering (frittage). The cutting performances and wear mechanisms of this ceramic tool were investigated. Compared with the Al₂O₃/Ti(C,N) ceramic tool, the Al₂O₃/Ti(C,N)/ZrO₂/CaF₂@Al(OH)₃ ceramic tool had lower cutting temperatures and surface roughness. When the cutting speed was increased from 100m/min to 300m/min, a lot of CaF₂ was smeared onto the surface of the ceramic tool, and the flank wear of the Al₂O₃/Ti(C,N)/ZrO₂/CaF₂@Al(OH)₃ ceramic tool was reduced. The main wear mechanisms of the Al₂O₃/Ti(C,N)/ZrO₂/CaF₂@Al(OH)₃ ceramic tool were adhesive wear and micro-chipping. The formation of solid lubricating film and the improvement of fracture toughness by adding ZrO₂ whiskers and CaF₂@Al(OH)₃ were important factors for the Al₂O₃/Ti(C,N)/ZrO₂/CaF₂@Al(OH)₃ ceramic tool to have better cutting performances.