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Improvement of thermally sprayed abradable coating by microstructure control
The aim of this work was to characterise the microstructure of recently developed abradable materials for providing a sealing between rotating and stationary parts in aerospace turbine engines. The investigated materials were two coatings obtained by thermal spraying of composite powder particles fr...
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Published in: | Surface & coatings technology 2006-12, Vol.201 (6), p.2303-2312 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The aim of this work was to characterise the microstructure of recently developed abradable materials for providing a sealing between rotating and stationary parts in aerospace turbine engines. The investigated materials were two coatings obtained by thermal spraying of composite powder particles from the AlSi–hBN and NiCrAl–bentonite systems. X-ray diffraction and scanning electron microscopy were used to analyse the microstructure and identify the structural elements of the coatings. These structural elements: the coarse porosities, the metallic binding phase and the embedded “abradable” particles were analysed by quantitative metallography. In particular, an image analysis procedure has been established to quantify different geometrical parameters related to the shape, size and orientation distribution, of these structural elements. |
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ISSN: | 0257-8972 1879-3347 |
DOI: | 10.1016/j.surfcoat.2006.03.047 |