Community Research and Development Information Service - CORDIS

FP5

ORDICO Report Summary

Project ID: G4RD-CT-2000-00319
Funded under: FP5-GROWTH
Country: Ireland

Improved Pt/Al coating process

A process has been developed to deposit Platinum/Aluminide coatings with improved properties onto single crystal Nickel super alloy substrates such as turbine blades. Although the Pt/Al anti-oxidation coating system has been in use in the gas turbine industry for some years, there was a need for a cost effective method, using less expensive coating equipment, which would produce superior oxidation and thermo-mechanical fatigue (TMF) properties.
This has now been achieved.

The coating is deposited in two stages. First Platinum is deposited on the super alloy substrate by a traditional Platinum electroplating process at low temperature. The Platinum coating thickness after plating is typically about 5 microns. Coated samples are then heated treated in a vacuum furnace at high temperature (>1000 C) to achieve adequate diffusion of the Platinum into the super alloy substrate.

Samples are then transferred to a high temperature Aluminium coating reactor of the "out of pack" type. Aluminising takes place at high temperature in conditions conducive to producing a "single phase" Pt/Al diffusion coating. By careful selection of the coating parameters it is possible to produce "single phase" Pt/Al coatings and to modulate the properties of these coatings depending on the desired balance of oxidation/fatigue performance required of the coating.

Laboratory studies indicate that improvements in oxidation performance (when compared to benchmark Pt/Al coatings) of up to 50% can be achieved and improvements in fatigue performance of 200 - 300% can be achieved using this ORDICO coating method.
It is expected that these coatings, when used in service, will result in significant extensions to the "on wing" life of turbine components and to a significant reduction in scrap page rates at engine overhaul.

This new process will be an important technical and commercial advantage to the industrial partners in the ORDICO project.

Related information

Reported by

SIFCO TURBINE COMPONENTS LTD
IDA IND. EST. CARRIGTWOHILL CO. CORK IDA IND. EST. CARRIGTWOHILL CO. CORK
00 CORK
Ireland
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