Tribological characterization of plasma-sprayed CoNiCrAlY-BN abradable coatings

  1. Get@NRC: Tribological characterization of plasma-sprayed CoNiCrAlY-BN abradable coatings (Opens in a new window)
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Journal titleJournal of Thermal Spray Technology
Pages252261; # of pages: 10
SubjectAbradable coating; Adhesive strength; Atmospheric plasma spray; Erosion resistance; MCrAlY; Coatings; Gas turbines; Hardness; Plasma jets; Porosity; Tribology; Plasma spraying
AbstractThe processing conditions, microstructural and tribological characterizations of plasma-sprayed CoNiCrAlY-BN high temperature abradable coatings are reported in this manuscript. Plasma spray torch parameters were varied to produce a set of abradable coatings exhibiting a broad range of porosity levels (34-62%) and superficial Rockwell hardness values (0-78 HR15Y). Abradability tests have been performed using an abradable-seal test rig, capable of simulating operational wear at different rotor speeds and seal incursion rates (SIRs). These tests allowed determining the rubbing forces and quantifying the blade and seal wear characteristics for slow and fast SIRs. Erosion wear performance and ASTM C633 coating adhesion strength test results are also reported. For optimal abradability performance, it is shown that coating hardness needs to be lower than 70 and 50 HR15Y for slow and fast blade incursion rate conditions, respectively. It is shown that the erosion wear performance, as well as, the coating cohesive strength is a function of the coating hardness. The current results allow defining the coating specifications in terms of hardness and porosity for targeted applications. This article is an invited paper selected from presentations at the 2013 International Thermal Spray Conference, held May 13-15, 2013, in Busan, South Korea, and has been expanded from the original presentation.
Publication date
AffiliationAutomotive and Surface Transportation; National Research Council Canada
Peer reviewedYes
NRC numberNRC-AST-145549
NPARC number21270856
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Record identifier5d1bf7e9-4b5b-4adc-9def-27ffae7cefba
Record created2014-02-17
Record modified2016-05-09
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