Development of Optical Techniques for Noncontact Inspection of Y-TZP Parts

Matysiak, Mateusz; Parry, Jonathan; Crowder, John Graham; Hand, Duncan Paul; Shephard, Jonathan D.; Jones, Nicholas F.; Jonas, Kevyn; Weston, Nick

doi:10.1111/j.1744-7402.2009.02418.x

Cited by 3 publications

(16 citation statements)

References 53 publications

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“…This heating is thought not to have an adverse clinical effect because the porcelain is sintered on Y-TZP at higher than 1,000°C. Matysiak et al reported a similar result in which blackening occurred within holes on zirconia irradiated using a HeNe laser 16) . After heating at 1,350°C, the sample became white again, and there was no significant variation after the heat treatment.…”

Section: Darkening Of the Machined Y-tzp Surface And Corresponding Cosupporting

confidence: 55%

A new method for fabricating zirconia copings using a Nd:YVO4 nanosecond laser

et al. 2014

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The purpose of this work was to fabricate zirconia copings from fully sintered Y-TZP blocks using a Nd:YVO 4 nanosecond laser in order to avoid complicated procedures using conventional CAD/CAM systems. To determine the most appropriate power level of a Nd:YVO 4 laser, cuboid fully sintered Y-TZP specimens were irradiated at six different average power levels. One-way ANOVAs for the average surface roughness and laser machining depth revealed that an average power level of 7.5 W generated a smooth machined surface with high machining efficiency. Y-TZP copings were then machined using the proposed method with the most appropriate power level. As the number of machining iterations increased, the convergence angles decreased significantly (p<0.01). The accuracy of the machined copings was judged to be good based on 3D measurements and traditional metal die methods. The proposed method using the nanosecond laser was demonstrated to be useful for fabricating copings from fully sintered Y-TZP.

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Section: Darkening Of the Machined Y-tzp Surface And Corresponding Cosupporting

confidence: 55%

A new method for fabricating zirconia copings using a Nd:YVO4 nanosecond laser

et al. 2014

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“…The experimental setup of the CMIR-TI system is presented in Figure 2. The infrared camera used previously for the MIR-TI set-up [33] was replaced with a high detectivity Vigo PVI-2TE-8 infrared detector with a 300µm x 300µm active region. The infrared detector used in the experiments is a mesa structure Hg 1-x Cd x Te photodiode with a response time below 7 ns.…”

Section: The Confocal Mid-infrared Transmission Imaging (Cmir-ti) Tecmentioning

confidence: 99%

“…The chopper and the detector were connected to the lock-in amplifier (Scitec Instruments Model 420) to enhance signal stability and to reduce any external noise from various heat sources in the laboratory. A 50 µm pinhole (Thorlabs P50C) size was chosen to compare the results with the MIR-TI technique [33] which uses a 50 µm pixel size infrared camera sensor. Another motivation for the choice of a 50 µm pinhole was the limited amount of light reaching the infrared detector.…”

Section: The Confocal Mid-infrared Transmission Imaging (Cmir-ti) Tecmentioning

confidence: 99%

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Infrared confocal imaging for inspection of flaws in yttria-stabilized tetragonal zirconia polycrystal (Y-TZP)

Matysiak¹,

Parry²,

Albri³

et al. 2011

Meas. Sci. Technol.

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“…The samples were sectioned after the experiment with the thermocouples in place. To measure the radial distance between the hole and the thermocouple tip the cross‐sections were imaged with a thermal source and camera using a novel infra‐red imaging technique described in Matysiak et al 18 . The measured temperature data is shown in Fig.…”

Section: Femmentioning

confidence: 99%

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

Parry

Ahmed

Dear

et al. 2010

International Journal of Applied Ceramic Technology

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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 masscustomization 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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Development of Optical Techniques for Noncontact Inspection of Y-TZP Parts

Cited by 3 publications

References 53 publications

A new method for fabricating zirconia copings using a Nd:YVO4 nanosecond laser

A new method for fabricating zirconia copings using a Nd:YVO4 nanosecond laser

Infrared confocal imaging for inspection of flaws in yttria-stabilized tetragonal zirconia polycrystal (Y-TZP)

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

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