Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Effect of Surface Conditioning of Platinum Aluminide Bond Coats on Thermal Barrier Coating Life

Laney, Scot Jason (2004) Effect of Surface Conditioning of Platinum Aluminide Bond Coats on Thermal Barrier Coating Life. Master's Thesis, University of Pittsburgh. (Unpublished)

Primary Text

Download (8MB) | Preview


Thermal Barrier Coatings (TBC) have been used for a number of years on components for use in aircraft gas turbine engines. The standard for processing these components includes grit blasting the bond coat prior to TBC deposition by Electron Beam Physical Vapor Deposition (EBPVD). While grit blasting has worked well for industry, it is argued that EBPVD TBC's are able to form strong bonds on smoother surface finishes. This would theoretically improve the component lifetime. This study involved the examination of the performance and failure of several industrially and economically viable alternative surface finishes as well as the effect of pre-oxidation treatments on the lifetime of the TBC. The system used consisted of a substrate of CMSX4 (Ni based superalloy), a platinum modified diffusional aluminide coating, and yttrium stabilized zirconia (YSZ) deposited by EBPVD as the TBC. Surface finishes applied prior to TBC deposition include 120 and 40 minute media finishes, barrel finish, and 3 mm hand polish. The various atmospheres were chosen for the pre-oxidation treatments in order to grow metastable and stable alumina scales. Exposure was done cyclically (1 hour cycles) at 1121oC in laboratory air until failure. Samples with the combination of media finish and mostly a alumina scales had lifetimes up to 1040 cycles. This is well beyond the expected value (~750 cycles) of a grit blasted sample in the same exposure conditions.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Laney, Scot Jasonsjlst20@pitt.eduSJLST20
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee CoChairPettit, F.Spettit@engr.pitt.eduPETTITFS
Committee CoChairMeier, G. Hghmeier@engr.pitt.eduGHMEIER
Committee MemberNettleship, Inettles@pitt.eduNETTLES
Committee MemberBarnard, J.Ajbarnard@engr.pitt.eduJBARNARD
Date: 13 September 2004
Date Type: Completion
Defense Date: 3 June 2004
Approval Date: 13 September 2004
Submission Date: 19 July 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: MSMSE - Master of Science in Materials Science and Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: alumina; bond coat; high temperature; oxidation; superalloy; surface roughness; TBC
Other ID:, etd-07192004-165714
Date Deposited: 10 Nov 2011 19:52
Last Modified: 15 Nov 2016 13:46


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item