Investigating material removal mechanism of Al-Si base abradable coating in labyrinth seal system

Zhang, Boxiu; Marshall, Matthew

doi:10.1016/j.wear.2019.01.034

Cited by 17 publications

(41 citation statements)

References 10 publications

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“…As described in the previous studies [1,2], during tests with discrete fins the dominant material removal mechanism was via extrusion, along with a limited amount of compacted material either peeling away from the rub track or rebounding behind the contact. Whilst it would appear that the extrusion mechanism is dominant as a consequence of the blunt nature of the fin geometry (Figure 2), given contact is parallel to the flat top surface, it is unclear how much the discrete fin sample has influenced the test, particularly as a a) compress and release mechanism is also observed.…”

Section: Figure 1 Different Contact Methods Under Different Working Condition A) Single Blade [3] B) Blades Assembly [3] C) Fin/abradablementioning

confidence: 80%

“…In this study, a decision was made to manufacture the segments and discrete fins from stainless steel. Comparing back to previous tests with discrete fins [2], investigations of the wear mechanism for fins has suggested that heat is generated through the incursion event, and is not easily dissipated as a consequence of the material removal mechanism combined with the fin geometry. When comparing fins manufactured from titanium to those from a heat resistant superalloy (Inconel 718), high thermal wear was noted with the titanium specimens.…”

Section: Figure 3 Three Different Fin Samples A) Whole-ring Fin B) Fin Segment C) Single Discrete Fin and D) Abradablementioning

confidence: 88%

“…The aim of this study is to investigate the impact of fin arc length and radius on the material removal mechanism present in a labyrinth fin seal contact, with a specific focus on the forces and temperatures developed. Tests are undertaken using the experimental set up previously detailed for discrete fin samples [1,2], with a new disc employed that is capable of investigating both a long fin segment, as well as a series of segments joined together to form a continuous fin (i.e. a whole ring).…”

Section: Figure 2 Discrete Fin Sample Geometrymentioning

confidence: 99%

“…Finally, all fin samples are tested against an aluminium silicon based thermally sprayed abradable material (M601NS) with R15Y hardness of 79-82. The abradable is sprayed onto a square steel square backing plate to a thickness of 3mm (Figure 3d), with this being a standard sample size used on the test equipment [2].…”

Section: Round Leading Edgementioning

confidence: 99%

“…Next, the test was commenced with force, temperature and visual results collected by the dynamometer, pyrometer and webcam respectively. In previous studies using this rig [1,2], a stroboscopic imaging system is also utilised, imaging the fin-abradable interaction on a pass by pass basis, thus quantifying wear. It should be noted that in this case, the stroboscopic system was not used, as in the case of the segmental fin samples, wear measurement is not possible given the continuous nature of the sample.…”

Section: D)mentioning

confidence: 99%

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An investigation into the role of specimen geometry when undertaking tribological testing on seal fin components

Zhang

Marshall

Lewis

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Labyrinth seal systems are used in aeroengines to seal the clearance, the understanding of the wear mechanism of labyrinth seal system is necessary to achieve better sealing performance. In this work a series of tests are conducted on a high-speed test rig capable of fin tip speeds of 100 m/s. With force and temperature measurements recorded in each case, the influence of specimen geometry is investigated. Surface examination and debris analysis is also performed using microscopy post-test. The wear mechanism was found to be influenced by fin geometry. A discrete fin was observed to trigger a more efficient material removal mechanism at both incursion conditions. Where the fin segment and ring-shaped fin leading to increased temperatures and material smearing. The heat dissipate role of fin was also observed during test where longer contact time of fin and abradable gives better heat removal performance.

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Section: Figure 1 Different Contact Methods Under Different Working Condition A) Single Blade [3] B) Blades Assembly [3] C) Fin/abradablementioning

confidence: 80%

Section: Figure 3 Three Different Fin Samples A) Whole-ring Fin B) Fin Segment C) Single Discrete Fin and D) Abradablementioning

confidence: 88%

Section: Figure 2 Discrete Fin Sample Geometrymentioning

confidence: 99%

Section: Round Leading Edgementioning

confidence: 99%

Section: D)mentioning

confidence: 99%

See 3 more Smart Citations

An investigation into the role of specimen geometry when undertaking tribological testing on seal fin components

Zhang

Marshall

Lewis

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Microstructural Modifications and Failure Mechanisms of an Aluminum‐Based Abradable Coating System during Isothermal and Cyclic Aging

Prillieux,

Thouron,

Josse

et al. 2024

Adv Eng Mater

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Abradable systems are used in the aeronautical industry to improve the efficiency of gas turbine. Those materials are exposed in service to temperature up to 450 °C. The increase in gas turbine efficiency requires to increase the operating temperature and therefore the service temperature of abradable coating. The present study focuses on the isothermal and cyclic thermal aging of the Al–Si abradable coating system in a laboratory air at high temperature up to 500 °C. The investigation encompasses the microstructural evolution, phase transformation, and the formation of cracks, along with their interrelated effects. During aging, silicon particles precipitate in the abradable top coat. In addition, coarsening of those particles is observed and the coarsening kinetics appears to be faster in cyclic thermal aging conditions compared to isothermal aging. During cyclic and isothermal aging, brittle aluminides develope at the abradable top–coat/bond–coat interface, due to the interdiffusion of Al and Ni species. During cyclic aging, thermal cycles create thermomechanical stress at the top‐coat/bont‐coat interface due to coefficient of thermal expansion mismatch between the Al‐Si deposit and intermetallic phases. The stress generated results in the formation of cracks and porosities at the top–coat/bond–coat interface resulting in a dramatic failure of the system.This article is protected by copyright. All rights reserved.

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Thick Cu-hBN Coatings Using Pulsed Gas Dynamic Spray Process: Coating Formation Analysis and Characterization

Nikbakht

Jodoin

2022

J Therm Spray Tech

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Investigating material removal mechanism of Al-Si base abradable coating in labyrinth seal system

Cited by 17 publications

References 10 publications

An investigation into the role of specimen geometry when undertaking tribological testing on seal fin components

An investigation into the role of specimen geometry when undertaking tribological testing on seal fin components

Microstructural Modifications and Failure Mechanisms of an Aluminum‐Based Abradable Coating System during Isothermal and Cyclic Aging

Thick Cu-hBN Coatings Using Pulsed Gas Dynamic Spray Process: Coating Formation Analysis and Characterization

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