Grinding of Transformation-Toughened Y-TZP Ceramics

Developments in ceramics have introduced a new class of ZrO2, ceramics called as ceramic steel. By controlling the mol. percentage and particle size, a Zirconia- Yuria ceramic was developed which exhibits toughening by tetragonal to monoclinc transformation. The inserts made of TTZ (Transformation Toughened Zirconia; were ground for application as a cutting tool. During surface grinding, toughening of surface material was observed: the amount of transformation was more with CBN than diamond grinding, indicating the stress induced nature of transformation. This transformation has influenced significantly specific grinding pressure, normal grinding force component and surface quality. © 1991 CIRP.