Titanium carbo-nitride complex silicon nitride tool

摘要

Titanium carbo-nitride complex silicon nitride tool is composed mainly of titanium carbo-nitride and silicon nitride and contains 10 to 56 wt% of Ti, 11.6 to 51 wt% of Si and 1 to 21 wt% in total of one or two or more of Ce, Y, Yb and Dy. The tool is mainly composed of Si3N4 superior in both strength and resistance against thermal shock and TiCN superior in the effect of suppressing reactivity of Si3N4 with Fe and exhibiting high hardness. By using oxides CeO2, Y2O3, Yb2O3 and Dy2O3 as sintering aid so that the sum of the amounts of Ce, Y, Yb and Dy will be in the above range, both the resistance against flank notch (wear) of the end edge (Vn) and resistance against thermal shock are improved resulting in improved durability as compared to the conventional silicon nitride cutting tool.