Development and Investigation on New Composite and Ceramic Coatings as Possible Abradable Seals

Bardi, Ugo; Giolli, C.; Scrivani, A.; Rizzi, G.; Borgioli, Francesca; Fossati, A.; Partes, Knut; Seefeld, Thomas; Sporer, D.; Refke, A.

doi:10.1007/s11666-008-9246-5

Cited by 25 publications

(7 citation statements)

References 6 publications

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“…When the porosity exceeded 20%, the stress release effect of pores was dominant, and the scraping contact force continued to decrease, indicating that the abradability of the coating was improved. This is consistent with the experimental results of Sporer [5] and Bardi [9]. Figure 8b shows the variation of the mean scraping contact force versus pore diameter at 20% porosity.…”

Section: Abradability and Scraping Process Simulationsupporting

confidence: 90%

“…Yttria-Stabilized Zirconia (YSZ) ceramic is the preferred material for abradable coatings due to its low thermal conductivity, low thermal expansion coefficient, and high melting point, as well as its excellent comprehensive mechanical properties [7]. Some studies have reported the preparation and characterization of YSZ coatings [8][9][10][11][12][13][14][15]. Atmospheric plasma spraying (APS) is one of the promising methods of preparing YSZ coating.…”

Section: Introductionmentioning

confidence: 99%

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Mesoscale Simulation and Evaluation of the Mechanical Properties of Ceramic Seal Coatings

Cheng

Liu

et al. 2022

Coatings

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Microstructure feature extraction and performance simulations of a Yttria-Stabilized Zirconia (YSZ) abradable coating applied in the high-pressure turbines of aero-engines, with a service temperature over 1000 °C were conducted. The finite element method (FEM) numerical models of the abradability, bonding strength, and thermal shock resistance of the YSZ coating were established. The effects of porosity and pore diameter on the properties of the coating were obtained through simulations and calculations. The results indicated that the abradability, bonding strength, and thermal shock resistance of the coating were jointly determined by porosity and pore diameter. With the porosity increasing from 5% to 50%, the bonding strength of the coating decreased gradually, but the abradability and thermal shock resistance of the coating were significantly improved, especially when the porosity was above 20%. With the pore diameter increased from 0.5 μm to 1.5 μm, the abradability, bonding strength, and thermal shock resistance of the coating increased initially, and then decreased. An evaluation function using the normalized weighting strategy was proposed to characterize the comprehensive properties of the coating. The results of the evaluation showed the optimal abradability, bonding strength, and thermal shock resistance of the coating were obtained under a combination of 25% porosity and 1 μm pore diameter. This study may provide guidance for design optimization, and an improvement in the microstructure and properties of coatings in future research.

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Section: Abradability and Scraping Process Simulationsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Mesoscale Simulation and Evaluation of the Mechanical Properties of Ceramic Seal Coatings

Cheng

Liu

et al. 2022

Coatings

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“…means [3] . Switzerland Sulzer Metco [4] , United Kingdom Sheffield the University [5] , Canadian National Research Institute [6] , Germany MTU [7] and Beijing Mining and Metallurgical Technology Group Co., Ltd. and other research units have successfully developed an abradable testing machine that can simulate the working conditions, and studied the characteristics and mechanism of high-speed friction and wear.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Environment on Simulation State of Abrasion Tester and Compensation Method

Sun¹,

Yu²,

Ma³

et al. 2019

dtetr

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Abrasive testing machine can effectively evaluate the wearability of sealed coatings for aircraft engines. High temperature, high speed and harsh working conditions have brought difficulties to the development of testing machines, At the same time, it brings motion error to the test machine feed system. This paper analyzes the error brought by the high temperature environment to the feeding system of the testing machine, and proposes an evaluation and compensation method. Through experimental verification, the method can effectively eliminate the experimental error caused by temperature and evaluate the wearability of the seal coating. Laid the foundation of research and provided accurate test evaluation conditions.

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“…Then to optimize the material selection and structural design of the metal honeycomb and labyrinth blade, an understanding of their tribological behavior is required. At present, Pratt & Whitney of America (Bill and Shiembob, 1977), Sulzer Innotec of Switzerland (Bardi et al, 2008), University of Sheffield (Stringer and Marshall, 2012), Alstom, the National Research Council Canada (Dadouche et al, 2008), Ohio State University (Padova et al, 2006), et al have developed their own abradable test equipment for abrasion interaction investigation and abradability performance evaluation of abradable seal materials. The most distinguishing characteristic of the new abradable test equipment is that it is able to simulate the high-speed and high-temperature working conditions which are similar to those of actual engines and other turbine or compressor machines.…”

Section: Introductionmentioning

confidence: 99%

Investigation of high-speed rubbing behavior of labyrinth-honeycomb seal for turbine engine application

Zhang

Guo³

et al. 2016

J. Zhejiang Univ. Sci. A

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Abstract:The labyrinth-honeycomb seal has been widely used in gas turbine engines as an abradable gas path seal to protect the rotor from wear and damage in rubbing interaction. It usually works with a stepped labyrinth because the knife-edged tips could produce a special dynamic sealing system, and then the minimum clearance is possible between the rotor and stationary component. To investigate the high-speed rubbing behavior between a Hastelloy-X honeycomb material and a GH4169 double stepped labyrinth, nine rubbing tests were conducted using a high-speed abrasion test rig while the blade tip speed varied from 150 to 450 m/s, and the incursion rate from 120 to 360 μm/s. The abradability of honeycomb made from Hastelloy-X was fully verified by analyzing the visual rubbing observations, rubbing forces, and impact acceleration. It is shown that compression deformation happens to the honeycomb material during the rubbing process with the labyrinth blade except for a simple cutting mechanism, which is mainly affected by the parameter of incursion rate. Thermal ablation and oxidation were the main damage occurring on the labyrinth tip and appeared more obviously at a higher blade tip speed. Rubbing forces and impact acceleration were obtained from a piezoelectric dynamometer and acceleration sensor during the rubbing process. At a blade tip speed of 300 m/s and incursion rate of 360 μm/s, radial and tangential forces show their maximum values of 716 N and 871 N, respectively. The peak value of acceleration presents 341g with the highest blade tip speed of 450 m/s and the highest incursion rate of 360 μm/s. All testing results provide a great deal of effective information on high-speed rubbing behavior for the abradablility evaluation of a honeycomb.

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Development and Investigation on New Composite and Ceramic Coatings as Possible Abradable Seals

Cited by 25 publications

References 6 publications

Mesoscale Simulation and Evaluation of the Mechanical Properties of Ceramic Seal Coatings

Mesoscale Simulation and Evaluation of the Mechanical Properties of Ceramic Seal Coatings

Influence of Thermal Environment on Simulation State of Abrasion Tester and Compensation Method

Investigation of high-speed rubbing behavior of labyrinth-honeycomb seal for turbine engine application

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