Improvement of thermally sprayed abradable coating by microstructure control

Faraoun, H.I.; Grosdidier, Thierry; Seichepine, J.L.; Goran, Daniel; Aourag, H.; Coddet, Christian; Zwick, Jochen; Hopkins, N.

doi:10.1016/j.surfcoat.2006.03.047

Cited by 72 publications

(28 citation statements)

References 9 publications

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“…Metallography, image analysis, X-ray diffraction and electron probe microanalysis [5,14] are useful techniques that can be used to analyse the composition and structure of abradable materials. Typically this has been done to investigate the performance of different thermal spray conditions, although the techniques are equally applicable to wear investigations.…”

Section: Introductionmentioning

confidence: 99%

An investigation of the relationship between wear and contact force for abradable materials

Fois

Watson

Stringer

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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Abradable linings are frequently used on the inside of aero-engine casings. During the operation of engine, the rotating blades may strike the lining of the casing. The wear mechanisms present during these incursions have been re-produced on a scaled test rig platform. Previously, characterisation of the wear has been performed using a stroboscopic imaging technique in order to identify the different wear mechanisms at the incursion conditions investigated. In the present study a dynamometer has been included in the test arrangement allowing the measurement of the contact force. This approach has then been combined with sectioning of the abradable test samples, in order to investigate the material response to the different incursion conditions. The wear results, the cutting force and material structure post-incursion show a high degree of correlation. At low incursion rates, significant consolidation and solidification of abradable material was observed, whilst at the same time adhesive transfer to the blade was recorded along with a low tangential to normal force ratio.At high incursion rates, little solidification and consolidation was observed, together with negligible adhesion and a higher tangential force, suggesting a cutting mechanism.Transitions in material behaviour, wear mechanism, and force ratio were observed at the same incursion condition, further highlighting the link between the different experimental measurements.

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Section: Introductionmentioning

confidence: 99%

An investigation of the relationship between wear and contact force for abradable materials

Fois

Watson

Stringer

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…This aspect of BN is used in thermally sprayed abradable coatings for aircraft engine housings, where coatings comprised of BN and metals allow turbine blades to smear the housing coating and maintain a close tolerance between the blade tip and the housing, which translates into improved engine efficiencies. 11 The thermal conductivity and inert nature of BN powder also improve thermal shock resistance and machinability of metal and ceramic matrices to which it is added. 12 Hot-pressing methods have been developed to achieve nearly full-density shapes comprised of BN, as well as BN composites with other ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ceramic boron nitride by terahertz time-domain spectroscopy

Naftaly

Leist

Dudley

2010

Journal of the European Ceramic Society

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“…The distinction between porosity and hexagonal boron nitride in Figure 2 is not clear. Therefore, in order to investigate how the fractions of the constituent phases have changed with hardness, the microscope images of the coatings were investigated using image segmentation [17,18,19]. In addition to the light field images shown above, images were taken using cross-polarized light [20].…”

Section: Materials Characterisationmentioning

confidence: 99%

The influence of material properties on the wear of abradable materials

Fois

Watson

Marshall

2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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In aero-engines it is possible for the blades of the compressor, turbine or fan to incur into their casings. At these interfaces a lining of composite abradable material is used to limit damage to components and thereby sustain the efficiency and longevity of the engine as a whole. These composite materials must have good abradability and erosion resistance. Previously, the wear mechanisms at the contact between the blade and the coating have been characterized using stroboscopic imaging and force measurement on a scaled test-rig platform.This work is focused on the characterization of the wear mechanism for two different of abradable lining. The established stroboscopic imaging technique and contact force measurements are combined with sectioning of the abradable material in order to analyse the material`s response during the tests. A measure of the thermal properties and the resulting temperature of the linings during the test have also been made to further understand the effect of coating hardness.The wear mechanism, material response, contact force and thermal properties of the coating have been used to characterize the different material behaviour with different hardness. At low incursion rates, with a soft coating, the blade tip becomes worn after an initial adhesive transfer from the coating. Post-test sectioning showed blade material and significant compaction present in the coating. The harder coating produced adhesion on the blade tip with solidification observed in the coating. Thermal diffusivity measurements and modelling indicated that thermally driven wear observed was as a consequence of the increased number of boundaries between the metal and hBN phases present interrupting heat flow, leading to a concentration of surface heat. At higher incursion rates the wear mechanism is more similar between the coatings and a cutting mechanism dominates producing negligible adhesion and blade wear.

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Improvement of thermally sprayed abradable coating by microstructure control

Cited by 72 publications

References 9 publications

An investigation of the relationship between wear and contact force for abradable materials

An investigation of the relationship between wear and contact force for abradable materials

Investigation of ceramic boron nitride by terahertz time-domain spectroscopy

The influence of material properties on the wear of abradable materials

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