Characterization and modification of technical ceramics through laser surface engineering

Shukla, Pratik; Lawrence, Jonathan

doi:10.1016/b978-1-78242-074-3.00005-2

Cited by 15 publications

(14 citation statements)

References 39 publications

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“…Surface treatment (laser irradiation) has been involved in the industrial field using high power lasers and represents a controllable and flexible technique aiming to modify the surface properties of different materials 5,6) . Laser processing parameters during such surface modifications are expected to influence the surface microstructure 7) and the hypothesis developed was that Carbon dioxide (CO2, 10,600nm) and Neodymium Yttrium Aluminum Perovskite (Nd: YAP, 1340nm) lasers could modify the CAD/CAM surface ceramic specimens (E.maxCAD, Emax ZirCAD).…”

Section: Introductionmentioning

confidence: 99%

The effect of CO2 and Nd:YAP lasers on CAD/CAM Ceramics: SEM, EDS and thermal studies

et al. 2016

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Background and aims:The objective of this study was to investigate the interaction of infrared laser light on Computer Aided Design and Computer Aided Manufacturing (CAD/CAM) ceramic surfaces. Material and Methods: Sixty CAD/CAM ceramic discs were prepared and divided into two different groups: lithiumdisilicate ceramic (IPSe.maxCADs) and Zirconia ceramic (IPSe.maxZirCADs). The laser irradiation was performed on graphite and non-graphite surfaces with a Carbon Dioxide laser at 5W and 10W power in continuous mode (CW mode) and with Neodymium Yttrium Aluminum Perovskite (Nd:YAP) laser at 10W. Surface textures and compositions were examined using Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). Thermal elevation was measured by thermocouple during laser irradiation. Results:The SEM observation showed a rough surface plus cracks and fissures on CO2 10W samples and melting areas in Nd:YAP samples; moreover, with CO2 5W smooth and shallow surfaces were observed. EDS analysis revealed that laser irradiation does not result in modifications of the chemical composition even if minor changes in the atomic mass percentage of the components were registered. Thermocouple showed several thermal changes during laser irradiation. Conclusion: CO2 and Nd:YAP lasers modify CAD/CAM ceramic surface without chemical composition modifications.

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Section: Introductionmentioning

confidence: 99%

The effect of CO2 and Nd:YAP lasers on CAD/CAM Ceramics: SEM, EDS and thermal studies

et al. 2016

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“…Despite this, it is first necessary to understand the laser beam–material interaction so that a correct wavelength is employed. From a close observation of the results of other investigation related to the physical effects of the laser–material interaction of a fibre and a CO 2 laser, 74 –76 it was found that a fibre (Yb:YAG) laser with a wavelength just over 1 µm but with much better beam quality could be ideal to bring about a considerable modification to the surfaces of engineering ceramics such as ZrO 2 and Si 3 N 4 . With this in mind, it can be further suggested that a fibre laser be employed to conduct future studies, but it is also known that the absorption of ceramics becomes higher with decreasing wavelengths.…”

Section: Discussionmentioning

confidence: 93%

Laser shock peening and mechanical shot peening processes applicable for the surface treatment of technical grade ceramics: A review

Shukla

Swanson

Page

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser shock peening and conventional mechanical shot peening are both comparable processes generally applicable to surface treat various metals and alloys. Commercial advantages offered by the laser systems such as flexibility, deep penetration of laser-induced shocks with precise control of the thermal pulses, shorter process times, high speeds, accuracy and aesthetics are attractive in comparison with the mechanical shot peening technique. Laser shock peening in the recent years has proved to be successful with steels, aluminium and titanium surfaces and metallic alloys in general. Nevertheless, minimal research has been conducted on laser shock peening and mechanical shot peening of technical grade ceramics. This article presents an update of the theory and to-date relevant literature within the two subject areas, as well as a comparison and a contrast between the mechanical and laser shock peening techniques. In addition, various gaps in knowledge are identified to propose further research for the development of both the techniques applicable to the surface treatment of technical grade ceramics.

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“…The laser beam can interact with a ceramic surface producing various effects, depending on the laser parameters such as wavelength, polarization, intensity, pulse duration, pulse repetition, and beam homogeneity, as well as on the properties of the surface such as coefficient of absorption, thermal relaxation time, thermal diffusivity, thermal conductivity, specific heat and latent heats of melting and evaporation, morphology, topography, temperature, and wetting [23][24][25][26][27][28][29][30][31]. Ceramic processing with lasers is characterized by high energy density and directionality, which permits a strongly localized heat treatment of a material with a spatial resolution better than 100nm.…”

Section: Laser-ceramics Interactionmentioning

confidence: 99%

“…The advantages of the laser processing of ceramics are: possibility of high accuracy, spatial and temporal control, and immediate change of laser parameters, material selectivity, and ecologically friendly characteristics [27][28][29][30][31]. However, very often, the thermal nature of the interaction causes unwanted side effects such as: chemical decomposition, thermal stresses, micro-cracking, melting and rapid re-solidification of the amorphous material.…”

Section: Laser-ceramics Interactionmentioning

confidence: 99%

Monitoring of a ceramic surface temperature field induced by pulsed Nd:YAG laser

et al. 2021

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Temperature distribution induced by laser radiation is a very important parameter for an efficient and safe application of lasers in different ceramic processing techniques. This paper presents the results of an infrared thermography (IRT) application for monitoring temperature distribution on a ceramic surface during Nd: YAG laser irradiation with different fluences and 8ns pulse duration. FLIR, E40 and SC7200 IR cameras were used with the aim of recording the maximum temperature in the irradiated zones. It was expected that IRT could give some information related to the heat affected zone and possible damage to the base material; however, the results have shown that IR cameras, even those with high performance such as SC7200, cannot record the maximum temperature value at the moment of laser operation, but only the average temperature of the bulk sample material after laser pulses. The results of the numerical simulation have confirmed the value of the thermographic measurements. The microstructure and micromorphology of the ceramic surface before and after the laser treatment were analysed by optical and scanning electron microscopy as well as by examining the roughness of the irradiated and non-irradiated surfaces, while the micromechanical changes were analysed by comparing the micro-hardness of the irradiated and non-exposed surfaces.

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Characterization and modification of technical ceramics through laser surface engineering

Cited by 15 publications

References 39 publications

The effect of CO2 and Nd:YAP lasers on CAD/CAM Ceramics: SEM, EDS and thermal studies

The effect of CO2 and Nd:YAP lasers on CAD/CAM Ceramics: SEM, EDS and thermal studies

Laser shock peening and mechanical shot peening processes applicable for the surface treatment of technical grade ceramics: A review

Monitoring of a ceramic surface temperature field induced by pulsed Nd:YAG laser

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