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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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Schmidt, M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (42/42 displayed)
- 2024Elucidating the impact of laser beam shape on the as-printed microstructure in 316L stainless steel
- 2023Direct laser-written aperiodic photonic volume elements for complex light shaping with high efficiency: inverse design and fabricationcitations
- 2023Spin-orbit coupled spin-polarised hole gas at the CrSe2-terminated surface of AgCrSe2citations
- 2023Spin-orbit coupled spin-polarised hole gas at the CrSe2-terminated surface of AgCrSe2citations
- 2022Evolution of an industrial-grade Zr-based bulk metallic glass during multiple laser beam meltingcitations
- 2022Charged domain wall and polar vortex topologies in a room-temperature magnetoelectric multiferroic thin filmcitations
- 2021Experimental, numerical and analytical investigation of the polyamide 12 powder bed fusion with the aim of building dimensionless characteristic numberscitations
- 2021Vibrational Microfeeding of Polymer and Metal Powders for Locally Graded Properties in Powder-Based Additive Manufacturingcitations
- 2021Coupling raman, brillouin and nd<sup>3+</sup> photo luminescence spectroscopy to distinguish the effect of uniaxial stress from cooling rate on soda-lime silicate glasscitations
- 2020Cooling rate calibration and mapping of ultra-short pulsed laser modifications in fused silica by Raman and Brillouin spectroscopycitations
- 2020Basic research for additive manufacturing of rubbercitations
- 2020Erratum: Cooling rate calibration and mapping of ultra-short pulsed laser modifications in fused silica by Raman and Brillouin spectroscopy (International Journal of Extreme Manufacturing DOI: 10.1088/2631-7990/ab9583)
- 2020Grain structure evolution of Al-Cu alloys in powder bed fusion with laser beam for excellent mechanical propertiescitations
- 2020Investigation of residual stresses in polypropylene using hot plate weldingcitations
- 2020Preparation of Fe-Co-B-Si-Nb bulk metallic glasses by laser powder bed fusion: Microstructure and propertiescitations
- 2019Glass Machining and In-situ Metrology: Recovery of spatiotemporal phase distribution from 2-dimensional interference fringe movement caused by irradiation of glass with ultrashort laser pulses at high pulse repetition rates
- 2019Glass machining and in-situ metrology: Recovery of spatio-temporal phase distribution from 2-dimensional interference fringe movement caused by irradiation of glass with ultra-short laser pulses at high pulse repetition rates
- 2019Superconductivity in Weyl semimetal NbP: Bulk vs. surface
- 2019Numerical estimation of local load during manufacturing process in high temperature PCB resin based on viscoelastic material modelingcitations
- 2019Two types of magnetic shape-memory effects from twinned microstructure and magneto-structural coupling in Fe1 +yTe
- 20183D grain growth simulation and experimental verification in laser beam melting of IN718citations
- 2018Analysis of shockwave formation in glass welding by ultra-short pulsescitations
- 2018A new approach to coat PA12 powders with laser-generated nanoparticles for selective laser sinteringcitations
- 2018On-line interferometric observation of thermomechanically induced refractive index changes during glass welding by ultra-short laser pulsescitations
- 2017Intermediate-Valence Ytterbium Compound Yb4Ga24Pt9: Synthesis, Crystal Structure, and Physical Propertiescitations
- 2017Micromechanical characterization of laser consolidated nanoparticle ITO layerscitations
- 2017A process chain for integrating piezoelectric transducers into aluminum die castings to generate smart lightweight structurescitations
- 2016Temperature-induced barium de-trapping from a double-well potential in Ba6Ge25citations
- 2016Layered-to-Tunnel Structure Transformation and Oxygen Redox Chemistry in LiRhO<inf>2</inf> upon Li Extraction and Insertioncitations
- 2015Lithium Insertion into Li<inf>2</inf>MoO<inf>4</inf>: Reversible Formation of (Li<inf>3</inf>Mo)O<inf>4</inf> with a Disordered Rock-Salt Structurecitations
- 2014Possible piezoelectric materials Cs M Zr<inf>0.5</inf>(MoO <inf>4</inf>)<inf>3</inf> (M = Al, Sc, V, Cr, Fe, Ga, In) and CsCrTi <inf>0.5</inf>(MoO<inf>4</inf>)<inf>3</inf>: Structure and physical propertiescitations
- 2014Structural invariance upon antiferromagnetic ordering in geometrically frustrated swedenborgite, CaBaCo2Fe2O7citations
- 2013Material properties of laser-welded thin silicon foilscitations
- 2013Magnetic Field-Induced Ferroelectric Switching in Multiferroic Aurivillius Phase Thin Films at Room Temperaturecitations
- 2013Process development for high volume manufacture of novel thermoplastic-compatible piezoceramic modules
- 2011Process development for high volume manufacture of thermoplastic composites with integrated piezoceramic modules
- 2011Laser process for extended silicon thin film solar cellscitations
- 2009In situ imaging of barnacle (Balanus amphitrite) cyprid cement using confocal raman microscopycitations
- 2008Investigations on high power impulse magnetron sputtering by optical emission spectroscopy of NiCr in different compositions (40/60 and 80/20)
- 2006Effect of beam angle on HAZ, recast and oxide layer characteristics in laser drilling of TBC nickel superalloyscitations
- 2006Isotropic-nematic interface and wetting in suspensions of colloidal plateletscitations
- 2004Submicron coatings for micro-tribological applicationscitations
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article
Effect of beam angle on HAZ, recast and oxide layer characteristics in laser drilling of TBC nickel superalloys
Abstract
Industrial applications of laser drilling include the production of cooling holes at acute angles in certain parts of the aero-engine components. These parts are often covered with ceramic thermal barrier coatings (TBC) to protect them from reaching excessive temperatures in hot engine environments. Acute angle TBC drilling brings three major simultaneous complications to the process. These are: (i) multi-layer drilling, (ii) non-symmetrical geometry and melt ejection, and (iii) increased depth of drilling. In a previous investigation by the authors, delamination of TBC was found as a main problem of angled drilling and mechanisms involved were studied. In the present study, implications of these difficulties on the hole quality is investigated through a comparative study of vertical and acute angle drilled holes. Characteristics of recast layer, heat-affected zone (HAZ), oxide layer and TBC delamination are investigated. Variation of these metallurgical characteristics with the depth of the hole is evaluated. Results for vertical and inclined holes are compared. The extent of HAZ, recast layer and oxide layer is seen to vary significantly with location and is found increasing with decreasing drilling angle to surface. Numerical simulation of pulsed laser heating of TBC Nimonic 263 was carried out for acute angle drilling with assist gas considerations. Results from the simulation suggested that the total heat transfer rate is higher on the leading edge side than the trailing edge of the heated region. Experimentally observed larger HAZ on leading edge side and larger recast layer on trailing edge side are explained by the analysis of heat flow characteristics obtained with the model. © 2006 Elsevier Ltd. All rights reserved.