Influence of sintering temperatures on material properties and corresponding milling machinability of zirconia ceramics

Sintering is a comprehensive process that involves complex evolution of material microstructures and properties, being recognized as a key factor to improve the machinability of ceramics. The present study aims to address the densification mechanisms of 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) based on the properly designed sintering experiments. The impacts of sintering temperature on the grain growth, phase composition, and mechanical properties were rigorously studied. A particular focus is placed on identifying the correlations between the sintering scheme and the machinability of 3Y-TZP by conducting a series of milling tests. The acquired results indicate that the porous zirconia begins to crystallize at 1100 degrees C and gradually converts to ceramic characteristics after 1200 degrees C, resulting in a significant increase of cutting forces and temperatures. Moreover, the zirconia sample sintered at 1200 degrees C exhibits obvious ductile-brittle removal characteristics and moderate hardness. Thus, a precise control of the machined surface quality can be achieved by cutting within the ductile regime.

Automated summary

This study investigates the densification mechanisms of 3Y-TZP through sintering experiments, focusing on the effects of sintering temperature on grain growth, phase composition, and mechanical properties. Results show that sintering temperature significantly impacts the cutting forces and temperatures of the zirconia, leading to changes in machinability. By conducting milling tests, the study also demonstrates the importance of precise control over machined surface quality through cutting within the ductile regime.