Abstract
An advanced ceramic cutting tool material Al_2O_3/TiC/TiN(LTN)is developed by incorporation and dispersion of micro-scale TiC particle and nano-scale TiN particle in alumina matrix.With the optimal dispersing and fabricating technology,this multi-scale and multi-phase nanocomposite ceramic tool material can get both higher flexural strength and fracture toughness than that of Al_2O_3/TiC(LT)ceramic tool material without nano-scale TiN panicle,especially the fracture toughness can reach to 7.8 MPa·m~(0.5).The nano-scale TiN can lead to the grain fining effect and promote the sintering process to get a higher density.The coexisting transgranular and intergranular fracture mode induced by micro-scale TiC and nano-scale TiN,and the homogeneous and densified microstructure can result in a remarkable strengthening and toughening effect.The cutting performance and wear mechanisms of the advanced multi-scale and multi-phase nanocomposite ceramic cutting tool are researched.
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