Cutting tip for metal-removing processing

摘要

A sintered cutting tip composed of 70-90 weight percent of aluminum oxide; 10-30 weight percent of zirconium oxide; 0.1-0.5 weight percent of magnesium oxide, and less than 0.6 weight percent of impurities, having a porosity of less than 2%, an average particle size of less than 1.7 mu m, and a fracture toughness KIc at room temperature of at least 190 N/mm3/2 and of at least 140 N/mm3/2 at 1000 DEG C. A method for manufacturing the cutting tip and its use are disclosed. Cutting tips in accordance with the present invention possess superior performance in terms of longer cutting life and are particularly suitable for use with case-hardened, quenched and tempered steels at high cutting speeds.