A Fiber-Laser Process for Cutting Thick Yttria-Stabilized Zirconia: Application and Modeling

Jonathan Parry, Rehan Ahmed, Fraser Dear, Jonathan Shephard, Marc Schmidt, Lin Li, Duncan Hand

Research output: Contribution to journalArticle

Abstract

A novel laser processing technique is demonstrated for cutting up to 13-mm-thick sections of Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic. Y-TZP is a high toughness engineering ceramic, which is extremely difficult to machine in its final state. However for some applications, this is nevertheless desirable. As an example, Y-TZP-based dentures represent an example of mass-customization in which it is essential to machine the required shape from solid billets rather than to produce customized molds. Typically this is done mechanically and necessitates the use of diamond-tipped grinding and drilling tools;, however, this process is very slow and suffers from problems of high tool wear. In this work, an Ytterbium fiber laser system has been used to achieve full thickness cuts via a novel controlled crack propagation technique at substantially greater thicknesses than previously possible. The build up of heat and stress in the material during the cutting process is analyzed in a finite-element model and compared with experimental data. This illustrates the mechanism by which cracks are driven in a controlled way to generate a cut. Processing rates are substantially faster than alternative cutting techniques available for this material with feed rates of up to 1.8 mm/s demonstrated.

Original languageEnglish
Pages (from-to)1277-1288
Number of pages12
JournalInternational Journal of Applied Ceramic Technology
Volume8
Issue number6
DOIs
Publication statusPublished - 2011

Cite this

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title = "A Fiber-Laser Process for Cutting Thick Yttria-Stabilized Zirconia: Application and Modeling",
abstract = "A novel laser processing technique is demonstrated for cutting up to 13-mm-thick sections of Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic. Y-TZP is a high toughness engineering ceramic, which is extremely difficult to machine in its final state. However for some applications, this is nevertheless desirable. As an example, Y-TZP-based dentures represent an example of mass-customization in which it is essential to machine the required shape from solid billets rather than to produce customized molds. Typically this is done mechanically and necessitates the use of diamond-tipped grinding and drilling tools;, however, this process is very slow and suffers from problems of high tool wear. In this work, an Ytterbium fiber laser system has been used to achieve full thickness cuts via a novel controlled crack propagation technique at substantially greater thicknesses than previously possible. The build up of heat and stress in the material during the cutting process is analyzed in a finite-element model and compared with experimental data. This illustrates the mechanism by which cracks are driven in a controlled way to generate a cut. Processing rates are substantially faster than alternative cutting techniques available for this material with feed rates of up to 1.8 mm/s demonstrated.",
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A Fiber-Laser Process for Cutting Thick Yttria-Stabilized Zirconia: Application and Modeling. / Parry, Jonathan; Ahmed, Rehan; Dear, Fraser; Shephard, Jonathan; Schmidt, Marc; Li, Lin; Hand, Duncan.

In: International Journal of Applied Ceramic Technology, Vol. 8, No. 6, 2011, p. 1277-1288.

Research output: Contribution to journalArticle

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