Study on Cutting Performance and Wear Mechanisms of Graded Ceramic Tool

In this paper, based on the experiments of high speed dry cutting nickel alloyed ductile iron with different nickel contents by graded ceramic tool, the cutting performance and wear mechanisms of graded ceramic tool were investigated. Results reveal that with the increase of cutting speed and nickel content the wear of graded ceramic tool is increased, wear mechanisms are transformated spalling and cohesive wear from abrasive wear, and chip shapes are turned into long arc segment from short segment.

Processing and Characterization of an Al2O3/TiCN Micro-Nano-Composite Graded Ceramic Tool Material

In this study, an Al2O3-based functionally graded ceramic tool material reinforced with TiCN micro-particles and nano-Al2O3 particles was fabricated by using hot-pressing technique. The experimental results showed that optimal mechanical properties were achieved for the composite with the addition of nano-Al2O3 particles increasing from 10vol.% in the surface to 20vol.% in the core, with the flexural strength, fracture toughness and Vicker’s hardness being 1073MPa, 5.99MPa.m1/2 and 21.78GPa, respectively. The microstructure and phase composition of the composites were characterized with SEM, TEM and XRD. It is believed that addition of nano-Al2O3 increasing from the surface to the core, which developed an nano-particles-rich tougher core and a hard Al2O3/TiCN-rich surface, improved the integrated mechanical properties of micro-nano-composite graded ceramic material.