Ref.: MCoFsu17-002
Apresentador: Bruno Edu Arendarchuck
Autores (Instituição): Arendarchuck, B.E.(Concordia University); BERTUOL, K.(Concordia University); Rivadeneira, F.(Concordia University); Stoyanov, P.(Concordia University);
Resumo:
The effectiveness of gas turbine engines strongly relies on the clearance of the rotating blades and the casing. Reducing this distance improves engine performance and reduces fuel consumption. Consequently, abradable coatings are applied to the casing to balance abradability and resistance to wear and erosion. The purpose of these coatings is to safeguard turbine blades from damage by wearing away in case of misalignment or vibration during operation. Typically, the coating material is softer than that of the turbine blades to facilitate abrasion. Maintaining low tip clearances and the design pressure ratio optimizes stage efficiencies and prevents unnecessary weight additions to the engine. Different sections of the engine require distinct materials to meet temperature and operational requirements. Composite materials like AlSi-polymer are commonly used in the low-temperature sections of gas turbine engines (GTE). Thermally sprayed abradable coatings offer corrosion resistance and lightweight advantages, although some alloys face challenges in application and processing. This study concentrates on a thorough analysis of novel aluminum-based abradable coatings, aiming to assess their impact on wear and erosion resistance critical for gas turbine engine applications. Material performance was evaluated through visual analysis at various magnification levels, supplemented by ex-situ analysis of worn surfaces to gain insights into wear mechanisms during testing. The results identify key material factors contributing to observed changes in wear analysis, providing fundamental data for further analysis of the interaction between rotating parts and the casing under real-engine conditions.