METAL-ORGANIC CHEMICALLY VAPOR DEPOSITED YTTRIA-STABILIZED ZIRCONIA (YSZ) FOR THERMAL BARRIER COATINGS
V. G. Varanasi, T. M. Besmann, W. Xu
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
abstract:Yttria-stabilized zirconia (YSZ) is used as a thermal barrier coating (TBC) to protect super-alloy blades such as Mar-M247 or Rene-N5 during engine operation. The current method for YSZ fabrication for TBC applications is by air-plasma spraying (APS) or electron beam-physical vapor deposition (EB-PVD).1-5 APS gives reasonable deposition rates, but has a limited life and aging effects due to its porous and lamellar structure. The EB-PVD coatings are more stable and can accommodate thermomechanical stresses due to their characteristic strain-tolerant, columnar microstructure. EB-PVD, however, is primarily line-of-sight, which often leaves hidden areas uncoated, has low throughput, and has high capital cost. The process of metal-organic chemical vapor deposition (MOCVD) is investigated here as an economical alternative to EB-PVD and APS, with the potential for better overall coverage as well as the ability to produce thick (100- 250 m), strain-tolerant, columnar coatings. MOCVD of YSZ involves the use of zirconium and yttrium organometallic precursors reacting with an oxygen source. Previous researchers have used -diketonate or chloride precursors and oxygen.6-8 These precursors have low transport rates due to their low carrier solvent solubility.9 Solvated zirconium and yttrium butoxide precursors were investigated here due to their higher vapor pressures and high solvent solubility. This work uses previously performed predictive equilibrium modeling and experiments involving butoxide precursors for tetragonal YSZ fabrication.10
keywords:chemical vapor; solubility; precursors; ZIRCONIA; vapor deposition; THERMAL BARRIER; EB-PVD; METAL-ORGANIC
本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://www.sunspraying.com/
|
