Chip morphology and surface integrity in ultraprecision cutting of yttria-stabilized tetragonal zirconia polycrystal. Issue 1 (2019)

• Record Type: Journal Article
• Authors: Yan, Jiwang; Okuuchi, Takumi
• Is Part Of: CIRP annals. Volume 68:Issue 1(2019)
• Page Start: 53
• Page End: 56
• Publication Date: 2019
• Subjects: Surface integrity -- Machinability -- Micro machining; Production engineering -- Research -- Periodicals; 670.5
• DOI: 10.1016/j.cirp.2019.04.050
• Languages: English
• ISSNs: 0007-8506

Abstract

Abstract: Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) is an important material for dental, biomedical, and mechanical applications. In this study, Y-TZP was cut by a single-crystal diamond tool in the micro-nanometre scale. The chip morphology and machined surface/subsurface properties under various conditions were investigated by scanning electron microscopy, Raman spectroscopy and cross-sectional transmission electron microscopy. Two factors dominating the material removal were identified: (i) crystal grain refinement and (ii) tetragonal-to-monoclinic phase transformation, the mechanisms of which were established by experiments and finite element simulations. This study provides a possible solution to the rapid fabrication of small 3D features on Y-TZP with nanometric surface roughness and an ultra-fine-grained subsurface layer.