Title: Critical conditions for brittle-ductile removal transition in nano-ZrO₂ dental ceramic grinding

Authors: C.H. Li; Z.R. Liu; Y.L. Hou; Y.C. Ding

Addresses: School of Mechanical Engineering, Qingdao Technological University, 266033, China ' School of Mechanical Engineering, Qingdao Technological University, 266033, China. ' School of Mechanical Engineering, Qingdao Technological University, 266033, China. ' School of Mechanical Engineering, Qingdao Technological University, 266033, China

Abstract: This study was aimed at the theoretical analysis and experimental investigation on the critical conditions for the brittle-ductile removal transition in nano-ZrO₂ dental ceramic grinding. The K-P36 numerical-control precision surface grinder was employed for the grinding test on 3Y-TZP nano-ZrO₂ dental ceramics. The experimental results indicated that the maximal thickness of the undeformed chipping smaller than 1.9 µm corresponded to the ductile removal mode; the brittle-fracture removal induced by side cracks appeared when the maximal thickness of undeformed chipping was between 1.9 µm and 2.1 µm, and the removal mode was brittle-ductile mixed removal; when the maximal thickness of undeformed chipping was 5.23 µm, large-scale brittle fracture appeared at the grinding surface, and a large number of pits induced by the brittle fracture in half-coin shape remained on the surface. It was deduced that the maximal thickness of undeformed chipping was the decisive factor that determined the brittle-ductile removal transition in nano-ZrO₂ grinding.

Keywords: nano zinc peroxide; nano ZnO2; dental ceramics; grinding; brittle-ductile removal transition; ceramic grinding; ductile removal mode; brittle fracture; thickness; undeformed chipping; nanotechnology.

DOI: 10.1504/IJMMM.2012.047836

International Journal of Machining and Machinability of Materials, 2012 Vol.11 No.4, pp.342 - 352

Received: 06 Jan 2011
Accepted: 11 Apr 2011
Published online: 23 Aug 2014 *

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