{"title":"The role of thermal properties in the wear mechanisms of an AlSi-polyester abradable","authors":"Aaron Baillieu, Eldar Rahimov, Matthew Marshall","doi":"10.1016/j.wear.2024.205618","DOIUrl":null,"url":null,"abstract":"<div><div>During run-in and operation, the blades of a gas turbine engine may rub against the engine casing. To allow for these blade rubs an abradable coating is applied to the casing. However, the coating does not always cut smoothly, potentially wearing the blade. This paper focuses on the wear mechanics which occur with Metco 601, an AlSi-Polyester abradable which has been shown to produce a combination of blade wear and adhesion.</div><div>In this study, by testing AlSi-Polyester of different hardnesses at various incursion rates and blade speeds, it has been shown that there is a statistically significant difference in the wear behaviour observed at 0.02μm/pass compared with those observed between 0.2 and 2 μm/pass. Simultaneous recording of the blade front, thermal hotspots on the blade and abradable, and force measurements have been used to relate observed wear mechanics to the thermal behaviour of the abradable. Results showed that at incursion rates above 0.2μm/pass high force application rates lead to localised hotspots on the abradable and sporadic adhesion events. At 0.02μm/pass the force application rate, and hence thermal energy flux into the abradable, is more gradual, allowing heat to spread across the abradable surface. The more uniform abradable temperature leads to large areas of simultaneous wear, demonstrating how the abradables ability to manage the thermal energy can have a significant impact on its wear performance. This has been further verified through the observation of a reduction in abradable temperature as the test progresses which aligns with a reduction in the thermal resistance through the abradable and also an observed transition from adhesion to blade wear.</div><div>This work has shown that the management of thermal energy within AlSi-Polyester has a significant impact on the observed wear mechanisms, improving the understanding of why the wear mechanics vary with incursion rate.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"562 ","pages":"Article 205618"},"PeriodicalIF":5.3000,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Wear","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0043164824003831","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
During run-in and operation, the blades of a gas turbine engine may rub against the engine casing. To allow for these blade rubs an abradable coating is applied to the casing. However, the coating does not always cut smoothly, potentially wearing the blade. This paper focuses on the wear mechanics which occur with Metco 601, an AlSi-Polyester abradable which has been shown to produce a combination of blade wear and adhesion.
In this study, by testing AlSi-Polyester of different hardnesses at various incursion rates and blade speeds, it has been shown that there is a statistically significant difference in the wear behaviour observed at 0.02μm/pass compared with those observed between 0.2 and 2 μm/pass. Simultaneous recording of the blade front, thermal hotspots on the blade and abradable, and force measurements have been used to relate observed wear mechanics to the thermal behaviour of the abradable. Results showed that at incursion rates above 0.2μm/pass high force application rates lead to localised hotspots on the abradable and sporadic adhesion events. At 0.02μm/pass the force application rate, and hence thermal energy flux into the abradable, is more gradual, allowing heat to spread across the abradable surface. The more uniform abradable temperature leads to large areas of simultaneous wear, demonstrating how the abradables ability to manage the thermal energy can have a significant impact on its wear performance. This has been further verified through the observation of a reduction in abradable temperature as the test progresses which aligns with a reduction in the thermal resistance through the abradable and also an observed transition from adhesion to blade wear.
This work has shown that the management of thermal energy within AlSi-Polyester has a significant impact on the observed wear mechanisms, improving the understanding of why the wear mechanics vary with incursion rate.
期刊介绍:
Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.