Transformations during grinding of ceria-stabilized tetragonal zirconia polycrystals

This paper reports that Ce-TZP is reported to exhibit cyclic transformation during machine grinding. Previous conclusions were based on the results obtained by grinding Ce-TZP at a single speed and depth of cut. In the present work, grinding parameters were carefully chosen to induce varied stresses. Results show that Ce-TZP exhibits cyclic transformation, not always, but only under certain favorable grinding conditions. Results are supported by XRD, optical microscopy, and dynamometric observations. Three stages of transformation, namely, a mechanical-stress-induced t to m, a frictional-heat-driven m to t, and a thermal-quenching-stress-induced t to m, in sequence, are clearly identified