4.7 Article

An atomic-scale and high efficiency finishing method of zirconia ceramics by using magnetorheological finishing

Journal

APPLIED SURFACE SCIENCE
Volume 444, Issue -, Pages 569-577

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.03.091

Keywords

Zirconia ceramics; Magnetorheological finishing; Ultra-smooth surface; Surface morphology

Funding

  1. National Natural Science Foundation of China [51675171]
  2. Science and Technology Planning Project of Hunan Province [2016TP1008]

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Zirconia ceramics is a valuable crucial material for fabricating functional components applied in aerospace, biology, precision machinery, military industry and other fields. However, the properties of its high brittleness and high hardness could seriously reduce its finishing efficiency and surface quality by conventional processing technology. In this work, we present a high efficiency and high-quality finishing process by using magnetorheological finishing (MRF), which employs the permanent magnetic yoke with straight air gap as excitation unit. The sub-nanoscale surface roughness and damage free surface can be obtained after magnetorheological finishing. The XRD results and SEM morphologies confirmed that the mechanical shear removal with ductile modes are the dominant material removal mechanism for the magnetorheological finishing of zirconia ceramic. With the developed experimental apparatus, the effects of workpiece speed, trough speed and work gap on material removal rate and surface roughness were systematically investigated. Zirconia ceramics finished to ultra-smooth surface with surface roughness less than Ra 1 nm was repeatedly achieved during the parametric experiments. Additionally, the highest material removal rate exceeded 1 mg/min when using diamond as an abrasive particle. Magnetorheological finishing promises to be an adaptable and efficient method for zirconia ceramics finishing. (C) 2018 Elsevier B.V. All rights reserved.

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