We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy.
- Authors
Bo He; Fei Li; Hong Zhou; Yongbing Dai; Baode Sun
- Abstract
A thermal spray technology high-velocity oxygen fuel (HVOF) was used to deposit NiCoCrAlY as a bond coating between the titanium alloy substrate and top 8 wt% yttria-stabilized zirconia thermal-barrier coating (TBC) deposited by electron beam-physical vapor deposition (EB-PVD). The thermal cycling and isothermal exposure tests were conducted to evaluate the durability of the TBC. Investigations using OM, SEM, EPMA, and XRD revealed that the thermal-sprayed BC makes the TBC more durable in isothermal exposure tests but more short-lived in thermal cycling tests, in comparison to our previous study in which the BC was prepared by EB-PVD. This is because the thermal-sprayed imperfections, such as microcracks and voids, elevate the diffusion resistance and degrade the mechanical properties of the BC, simultaneously. To current TBC systems in which the BC is deposited by HVOF, thermal failure behaviors--such as the formation of the Ti/Al mixture oxides at some individual places in the BC, and the Ti2Ni gaps formed around the BC/substrate interface--were also discussed.
- Subjects
TITANIUM alloys; ZIRCONIUM oxide; AERODYNAMIC heating; COATING processes; PHYSIOLOGICAL effects of heat; SURFACE chemistry
- Publication
Journal of Coatings Technology & Research, 2008, Vol 5, Issue 1, p99
- ISSN
1945-9645
- Publication type
Article
- DOI
10.1007/s11998-007-9070-8