| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Shukla, P. P.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2011Mathematical modelling of the fibre laser surface processing of a zirconia engineering ceramic by means of three-dimensional finite element analysiscitations
- 2011Characterization and compositional study of a ZrO2 engineering ceramic irradiated with a fibre laser beamcitations
- 2011Influence of laser beam brightness during surface treatment of a ZrO2 engineering ceramic
- 2011Distribution of temperature during fibre laser radiation and the effects on the phase transformation of ZrO2 engineering ceramiccitations
- 2011Modification of fracture toughness parameter K1c following CO2 laser surface treatment of Si3N4 engineering ceramiccitations
- 2011Evaluation of fracture toughness of ZrO2 and Si3N4 engineering ceramics following CO2 and fibre laser surface treatmentcitations
- 2011Examination of temperature distribution and the thermal effects on Si3N4 engineering ceramics during fibre laser surface treatmentcitations
- 2010Fracture toughness modification by using a fibre laser surface treatment of a silicon nitride engineering ceramiccitations
- 2010On the establishment of an appropriate method for evaluating the residual stresses after laser surface treatment of ZrO2 and Si3N4 engineering ceramics
Places of action
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article
Modification of fracture toughness parameter K1c following CO2 laser surface treatment of Si3N4 engineering ceramic
Abstract
Surface treatment of a Si<sub>3</sub>N<sub>4</sub> engineering ceramic assisted by a CO<sub>2</sub> laser was conducted to identify changes in the fracture toughness parameter K<sub>1c</sub>. The K<sub>1c</sub> was determined by using a Vickers macrohardness indentation method before and after the CO<sub>2</sub> laser surface treatment. Optical microscopy and infinite focus variation techniques were then adopted to measure the crack length and to investigate the surface morphology as well as the crack geometry within the engineering ceramic. Thereafter, computational and analytical methods were employed to calculate the K<sub>1c</sub>. Chemical analysis was further conducted to elucidate the change in composition as a result of the CO<sub>2</sub> laser surface irradiation. The results showed that a decrease in the near surface hardness of 7 and 44% in the resulting crack lengths was found with the Si<sub>3</sub>N<sub>4</sub> engineering ceramic following the CO<sub>2</sub> laser surface treatment. This inherently led to an increase in the K<sub>1c</sub>. A rise in the K<sub>1c</sub> of 64% for the Si<sub>3</sub>N<sub>4</sub> engineering ceramics was found (under the applied conditions) in comparison to the as received surface. This occurred due to the Si<sub>3</sub>N<sub>4</sub> engineering ceramic being oxidised and further forming a new surface layer, which was somewhat softer than that of the as received or laser unaffected surface. Compositional analysis showed that the formation of the new surface layer as a result of the CO<sub>2</sub> laser surface treatment was found to be SiO<sub>2</sub>.