Nanosecond-laser postprocessing of millisecond-laser-machined zirconia (Y-TZP) surfaces

Jonathan P. Parry, Jonathan D. Shephard, Fraser C. Dear, Nick Jones, Nick Weston, Duncan P. Hand

Research output: Contribution to journalArticle

Abstract

Millisecond-pulsed Nd:YAG laser systems can be used for high-speed cutting of ceramics, due to the high average power available. However, due to the relatively long pulse duration (0.3-5 ms), millisecond laser-machining is predominantly a thermal, melt-eject process. The quality of the finished surface is limited by a redeposited melt and a heat-affected zone, in particular surface cracking. Shorter pulse duration lasers can provide a better surface finish but with a significantly longer processing time. This paper presents a method of improving the finish of millisecond-machined yttria-stabilized tetragonal zirconia polycrystal surfaces by postprocessing with a nanosecond-pulsed laser. Nanosecond machining was carried out directly onto the as-cut surface produced after millisecond processing, yielding a dramatic improvement of the surface finish in a relatively short time. © 2008 American Ceramic Society.

Original languageEnglish
Pages (from-to)249-257
Number of pages9
JournalInternational Journal of Applied Ceramic Technology
Volume5
Issue number3
DOIs
Publication statusPublished - May 2008

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zirconium oxides
lasers
pulsed lasers
pulse duration
ceramics
laser machining
heat affected zone
polycrystals
yttria-stabilized zirconia
machining
YAG lasers
high speed

Cite this

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title = "Nanosecond-laser postprocessing of millisecond-laser-machined zirconia (Y-TZP) surfaces",
abstract = "Millisecond-pulsed Nd:YAG laser systems can be used for high-speed cutting of ceramics, due to the high average power available. However, due to the relatively long pulse duration (0.3-5 ms), millisecond laser-machining is predominantly a thermal, melt-eject process. The quality of the finished surface is limited by a redeposited melt and a heat-affected zone, in particular surface cracking. Shorter pulse duration lasers can provide a better surface finish but with a significantly longer processing time. This paper presents a method of improving the finish of millisecond-machined yttria-stabilized tetragonal zirconia polycrystal surfaces by postprocessing with a nanosecond-pulsed laser. Nanosecond machining was carried out directly onto the as-cut surface produced after millisecond processing, yielding a dramatic improvement of the surface finish in a relatively short time. {\circledC} 2008 American Ceramic Society.",
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Nanosecond-laser postprocessing of millisecond-laser-machined zirconia (Y-TZP) surfaces. / Parry, Jonathan P.; Shephard, Jonathan D.; Dear, Fraser C.; Jones, Nick; Weston, Nick; Hand, Duncan P.

In: International Journal of Applied Ceramic Technology, Vol. 5, No. 3, 05.2008, p. 249-257.

Research output: Contribution to journalArticle

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