Abradable Coatings for Small Turboprop Engines: A Case Study of Nickel-Graphite Coating
For the engines used in small turboprop aircrafts, the introduction of abradable coatings represents a feasible way to reach higher levels of overall engine efficiency, specifically by improving the fuel consumption and increasing the inter-turbine temperature margin. Abradable coatings on seals also contribute to improved hot restarts capability of an engine and lead to substantial extension of service life of the rotating counter bodies. In our contribution, we concentrate on flame-sprayed nickel-graphite abradable coating that can be used in turboprop engines both for seals and clearance control. The focus is the impact of spraying parameters on the physical and function properties of the abradable coating.
Keywordsabradable coating aerospace coatings for engine components erosion resistance Rietveld analysis
The paper has originated in the framework of the solution of the Ministry of Trade of the Czech Republic project number FV-TRIO FV10211. The authors would like to thank F. Lukáč from IPP ASCR for providing the XRD analyses and M. Bystrianský from RTI UWB for SEM analyses.
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