Cutting Properties of Al₂O₃-20%TiB₂/Al₂O₃-20%TiC Symmetrical Laminated Ceramic Cutting Tool

Al2O3-20%TiB2(surface layer)/Al2O3-20%TiC(middle layer)symmetrical laminated ceramic cutting tool material (Al2O3 is substrate,TiB2 and TiC are enhancement phases) was produced by powder lamination and hot-pressing sintering techniques.The bending strength and fracture toughness of the symmetrical laminated ceramic cutting material were measured and its cutting properties were also investigated and compared with those of Al2O3-20%TiC ceramic cutting tool after dry cutting hardened 45 steel continuously. The results show that the bending strength and fracture toughness of the symmetrical laminated ceramic cutting material were 651 MPa and 4.59 MPa·m1/2 respectively and 11 MPa and 0.59 MPa·m1/2 higher than those of Al2O3-20%TiC ceramic.The symmetrical laminated cutting tool had smaller cutting force and wear,and its cutting properties were superior to those of Al2O3-20%TiC ceramic cutting tool.