HUANG Chuanzhen

LIU Hanlian
School of Mechanical Engineering,
Shandong University,
Jinan 250061, China

WANG Jun
School of Mechanical and Manufacturing Engineering,
The University of New South Wales,
Sydney, NSW2052, Australia

WANG Hui
School of Mechanical Engineering,
Shandong University,
Jinan 250061, China

Abstract: An advanced ceramic cutting tool material Al₂O₃/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 Al₂O₃/TiC (LT) ceramic tool material without nano-scale TiN particle, 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.

Key words: Multi-scale and multi-phase Ceramic tool material Mechanical properties Cutting performance