Bruno E. Arendarchuck, Kaue Bertuol, Francisco Rivadeneira, Bruno C. N. M. de Castilho, Barry Barnett, Christian Moreau, Pantcho Stoyanov
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引用次数: 0
Abstract
The efficiency of gas turbine engines can significantly be enhanced by reducing the clearance between stationary and rotating parts. AlSi-polymer composite abradable coatings are commonly employed for such applications to serve as sacrificial materials while maintaining the pressure within compressors and seals. However, these coatings can face premature failure during operation, particularly due to corrosion and erosion. More specifically, due to the ductile behavior of AlSi-polymer-based abradables, the erosion rates at low impingement angles are particularly high. Thus, there is a strong desire to develop an abradable system capable of maintaining high erosion resistance at various impingement angles while maintaining suitable abradability (i.e., high wear of the abradable during interaction with the blade tip). The main purpose of this study is to critically evaluate the influence of Ni in AlSi-polymer-based abradable coatings on their erosion and tribological performance. The AlSi-polymer powders were mechanically mixed to develop the powders that were subsequently deposited using atmospheric plasma spray (APS). Microstructure analysis using field emission scanning electron microscopy (FESEM) and HR15Y hardness tests was employed to assess the microstructural and mechanical properties of the coating. Ball-on-flat, ball-on-disk, and air jet erosion tests were performed, followed by ex situ surface analysis to elucidate the wear mechanism. The results revealed that the incorporation of Ni preserved the lamellar microstructure characteristic of AlSi and polyester abradable coatings, while concurrently decreasing average wear rates at lower impingement angles, as observed throughout the erosion tests.
期刊介绍：
The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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