Microholes in zirconia-coated Ni-superalloys for transpiration cooling of turbine blades

Horn, Alexander; Weichenhain, R.; Albrecht, Sven; Kreutz, E. W.; Micheľ, J.; Nießen, Markus; Kostrykin, Vadim; Schulz, Wolfgang; Etzkorn, A.; Bobzin, K.; Lugscheider, E.; Poprawe, Reinhart

doi:10.1117/12.407331

Cited by 19 publications

(6 citation statements)

References 2 publications

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“…The inner surface of the hole at the undercut side which was Laser drilled hole in a complete TBC-Coating system [8] never in a line of sight with the vapour source was not coated, as expected. The holes were prepared with holes of five different tilting angles.…”

Section: Resultssupporting

confidence: 70%

Widening the usability of yttria stabilised zirconia by advanced cooling technology

Lugscheider

Bobzin

Etzkorn

2001

Mat.-wiss. u. Werkstofftech.

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The use of yttria stabilised zirconia as thermal barrier material for gas turbine applications is limited because of sintering effects within the coating at high temperatures. The sintering of the coating is accompanied by a deterioration of the mechanical properties which leads to a reduction in coating function, lifetime and reliability. Many research work is ongoing to develop new materials for thermal barrier applications with better sintering resistance. Another way to face the problem is the improvement of the gas turbine cooling technology. Because of the very good property mixture of yttria partial stabilised zirconia (low thermal conductivity, high thermal expansion, low young's modulus, established processes, availability …) this is a very promising way. Transpiration cooling shows a high potential for the temperature reduction at constant efficiency. The presentation shows some new aspects of coating technology caused by changed surface conditions of transpiration cooled surfaces as they are subject in the collaborative research center (SFB) 561 “Thermally highly loaded porous and cooled multilayer systems for combined cycle power plants”.

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Section: Resultssupporting

confidence: 70%

Widening the usability of yttria stabilised zirconia by advanced cooling technology

Lugscheider

Bobzin

Etzkorn

2001

Mat.-wiss. u. Werkstofftech.

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“…One of the main challenges is drilling through multilayer material systems composed of metal coatings with at least one ceramic wear protection layer without enhanced formation of microcracks and thermal induced damage causing a removal of the coating layers. Furthermore, to achieve significant cooling performance the cooling holes are generally tapered or shaped [43]. While EDM has comparatively lower machine tool costs, parallelized machining capability [27], and better process control in terms of reduced HAZs, it is limited to the machining of electrically conductive materials and therefore cannot be applied for ceramiccoated turbine blades.…”

Section: Laser Beam Machiningmentioning

confidence: 99%

“…24 Laser drilling of cooling holes: nickel-based turbine blade coated with a ceramic wear resistance layer with cooling holes and cross-section of a cooling hole drilled in a CMSX-4 turbine blade coated with a MCrAlY and zirconia wear resistance layer. (Compiled from Beck[42] and Horn et al[43]. )…”

mentioning

confidence: 99%

Nontraditional Machining of Stainless Steels and Super Alloys

2015

Machining of Stainless Steels and Super Alloys

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“…Horn et al [24] examined the effects of three assist gases nitrogen, argon and oxygen on the recast layer thickness (RLT) and cracking in coated CMSX-4 laser trepanned drill holes at an acute angle up to 60°to the surface. The results showed that the RLT was at least two to three times less when using argon assist gas in comparison to oxygen and nitrogen during trepanning laser drilling.…”

Section: Introductionmentioning

confidence: 99%

Investigation of recast and crack formation in laser trepanning drilling of CMSX-4 angled holes

Morar

Roy

Mehnen

et al. 2018

Int J Adv Manuf Technol

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This paper presents an experimental investigation on the influences of laser trepanning drilling process parameters on the recast layer thickness and surface crack formation in CMSX-4 nickel-based superalloy angled holes. The effects of peak power, pulse frequency and the trepanning speed as input parameters were investigated in details by varying the laser drilling conditions using Taguchi orthogonal array-based design of experiment approach. Analysis of variance identifies the significant parameters affecting the output responses. It is found that the output responses are affected mainly by the peak power and trepanning speed. The experimental results reveal that the recast layer thickness increases with the increase of peak power and trepanning speed whereas the crack number density decreases with the increase of peak power only. Pulse frequency has no significant effect on both output responses within the range of values investigated. The knowledge gained in this parametric study could be used to improve the metallurgical characteristics of laser-drilled nickel-based acute angled holes.

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Microholes in zirconia-coated Ni-superalloys for transpiration cooling of turbine blades

Cited by 19 publications

References 2 publications

Widening the usability of yttria stabilised zirconia by advanced cooling technology

Widening the usability of yttria stabilised zirconia by advanced cooling technology

Nontraditional Machining of Stainless Steels and Super Alloys

Investigation of recast and crack formation in laser trepanning drilling of CMSX-4 angled holes

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