On The Potential Of Metal And Ceramic Based Abradables In Turbine Seal Applications.

Sporer, D.; Wilson, Scott; Giovannetti, Iacopo; Refke, A.; Giannozzi, Massimo

doi:10.21423/r1336h

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…11, it can be observed that severe wear occurs on the bare blade under all tested conditions. The results obtained in this test are more severe than those obtained by Sporer et al [4]. This may be related to the differences in the properties of the blade materials or the abradable coatings.…”

Section: Diagram Of Wear Mechanismcontrasting

confidence: 62%

“…And the longer the wear distance, the greater the damage to the blade. When the incursion depth (D) is fixed, the blade and the coating interaction when the theoretical wear distance can be obtained by the formula (3)(4)(5). As can be seen from the formula, the theoretical wear distance is proportional to the linear velocity (n), and inversely proportional to the incursion rate (Vi).…”

Section: Effect Of Linear Velocity and Incursion Rate On Blade Wearmentioning

confidence: 99%

“…However, due to the presence of centrifugal forces, thermal expansion, machining, and installation errors, small clearances inevitably lead to undesired scratching of the rotor blades against the inner wall of the case [2,3]. For this reason, in the engineering field, abradable sealing coatings are applied to the inner wall of the case to form a particular friction pair with the rotor blades so that the wear is borne by the coating as much as possible when the scratch occurs between the two [4,5]. While taking into account the small clearance, the blade damage is minimized, and blade safety is ensured.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the wear mechanism between the friction pairs was complex and dynamic. Sporer et al [4] briefly evaluated the effect of porosity on the thermal shock life, abradability, and erosion resistance of YSZ ceramic-based abradable coatings. They found that the thermal shock life and abradability of the coatings increased with the increase in porosity, but their erosion resistance became progressively worse.…”

Section: Introductionmentioning

confidence: 99%

“…The wide range of tests helped us study the effects of line velocity and incursion rate in more detail. These parameters were chosen based on the operating conditions of the turbine engine and have also been used by other researchers[4]. They have been shown to reproduce the wear mechanisms in turbine engines.…”

mentioning

confidence: 99%

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High-Speed Rubbing Behavior Between Nickel-Based Superalloy Blades and Ceramic-Based Abradable Coatings

Yang,

Gao,

Xue

et al. 2023

Tribol Lett

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The tribological behavior of nickel-based superalloy blades with YSZ ceramicbased abradable coatings was investigated using a self-developed high-speed rubbing tester, focusing on the effect of working parameters (linear velocity and incursion rate) on blade and coating damage mechanisms. A non-contact infrared thermometer and a high-speed camera were used to determine real-time changes in coating surface temperature and blade length. The wear morphology and elemental composition of the blade and coating were characterized by a scanning electron microscope, an ultra-depth three-dimensional microscope, and an energy spectrometer. The test results showed that at the same incursion rate, the degree of blade wear tended to increase and then decrease with the increase of linear velocity, and the maximum degree of blade wear was reached at 200 m/s. There was no significant correlation between the degree of blade wear and the incursion rate at the same linear velocity. The linear velocity was the primary influence on driving friction, while the incursion rate became a secondary factor, contrary to the well-known law in metal-based abradable coatings. The main forms of damage to blades included grooving, overheating, and micro-rupture. Plastic removal was the main wear mechanism for blades. The damage mechanism of ceramic-based abradable coatings was mainly characterized by sub-surface cracking. The brittle removal of the coating resulted in "stepped" wear of the blade and a short actual action time of the friction pair. In this paper, the wear mechanisms of nickel-based superalloy blades and ceramic-based abradable coatings were mapped for the first time.

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Section: Diagram Of Wear Mechanismcontrasting

confidence: 62%

Section: Effect Of Linear Velocity and Incursion Rate On Blade Wearmentioning

confidence: 99%