CHEMICALLY VAPOR DEPOSITED YTTRIA-STABILIZED ZIRCONIA (YSZ) FOR THERMAL AND ENVIRONMENTAL BARRIER COATING

Conference · Tue Apr 22 00:00:00 EDT 2003

OSTI ID:835696

Varanasi, V G; Besmann, T M; Lothian, J L; Xu, W; Starr, T L

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) (Haynes 1997). 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 {micro}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 (Wahl et al. 2001a, Wahl et al. 2001b, Yamane and Harai 1989). These precursors have low transport rates due to their low carrier solvent solubility (Varanasi et al. 2003). Solvated zirconium and yttrium butoxide precursors were investigated here due to their higher vapor pressures and high solvent solubility. This work uses predictive equilibrium modeling and experiments involving butoxide precursors for tetragonal YSZ fabrication.

• Research Organization: Oak Ridge National Lab., Oak Ridge, TN (US); University of Louisville (US)
• Sponsoring Organization: US Department of Energy (US)
• OSTI ID: 835696
• Resource Relation: Conference: 17th Annual Conference on Fossil Energy Materials, Baltimore, MD (US), 04/22/2003--04/24/2003; Other Information: PBD: 22 Apr 2003
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CAPITALIZED COST
CHEMICAL VAPOR DEPOSITION
CHLORIDES
COATINGS
DEPOSITION
ELECTRON BEAMS
ENGINES
FABRICATION
MICROSTRUCTURE
OXYGEN
PHYSICAL VAPOR DEPOSITION
SOLUBILITY
SOLVENTS
STRESSES
THERMAL BARRIERS
VAPOR PRESSURE
YTTRIUM
ZIRCONIUM