Cutting performance and wear resistance of Al₂O₃/TiC/CaF₂@Al₂O₃ ceramic tools in dry machining of hardened steel

抄録

For the sake of enhance the cutting performance of self-lubricating ceramic tools, in this paper, we prepared self-lubricating tool materials by adding CaF₂@Al₂O₃ coated powder with core–shell structured as solid lubricant, the cutting performance of ceramic tool materials were investigated through dry machining of hardened steel, and the wear mechanism was explored. The results showed that CaF₂@Al₂O₃ core–shell structured solid lubricant in the ceramic tool material was more effective than CaF₂ in improving the wear resistance. The addition of CaF₂@Al₂O₃ core–shell structured solid lubricant in the ceramic tool materials can reduce the cutting force and cutting temperature. Under the same cutting conditions, compared with Al₂O₃/TiC/CaF₂ ceramic cutting tool, the Al₂O₃/TiC/CaF₂@Al₂O₃ tool had lower surface roughness of workpieces, while the main cutting force and cutting temperature are reduced by 27.7 and 52.6 % respectively in the cutting process. The wear of the rake face included micro-chipping, crater wear and adhesive wear, while the wear of flank face included micro-chipping, adhesive wear and abrasive wear. The ceramic tool with CaF₂@Al₂O₃ core–shell structured solid lubricant obtained outstanding cutting performance.