|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High-Temperature Systems for Energy Conversion and Storage
||Thick Zirconia Coatings by Electrolytic Anodisation
||Subodh Patel, Vikram Jayaram, Dipankar Banerjee
|On-Site Speaker (Planned)
The anodisation process used for making thin (1-2 microns) porous films of titania or zirconia has been extended to the synthesis of 200 micron coatings that are potential candidates as thermal barriers. In anodisation, oxidation occurs by ionic transfer across a barrier layer while simultaneous etching by fluoride ions creates an ordered array of ~ 50 nm channels for the continued ingress of electrolyte. A systematic study of the time evolution of current and film thickness coupled with ICP analysis indicates that the thickness of zirconia scales linearly with charge, with approximately 15% of the metal oxidised to form zirconia; the balance being dissolved in the solution. The growth is parabolic in time with replenishment of solution through the nanometric pore channels being the likely rate limiting step. Possibilities for extending the process will be discussed to create stable films that are resistant to thermal cycling.
||Planned: A print-only volume