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Chemically Vapor Deposited Yttria-Stabilized Zirconia (YSZ) for Thermal and Environmental Barrier Coating.

DE2005835696

Publication Date	2005
Personal Author	Varansi, V. G.; Besmann, T. M.; Lothian, J. L.
Page Count	14
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) (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.
Keywords	Zirconium Plasma spraying Chemical vapor deposition Barrier coatings Thermal barriers Fabrication Solvents Vapor pressure Yttrium Microstructure Yttria stabilized zirconia
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Oak Ridge National Lab., TN.; Louisville Univ., KY.
Supplemental Notes	Prepared in cooperation with Louisville Univ., KY.
Document Type	Technical Report
NTIS Issue Number	200524

Chemically Vapor Deposited Yttria-Stabilized Zirconia (YSZ) for Thermal and Environmental Barrier Coating.

Chemically Vapor Deposited Yttria-Stabilized Zirconia (YSZ) for Thermal and Environmental Barrier Coating.
DE2005835696

Publication Date	2005
Personal Author	Varansi, V. G.; Besmann, T. M.; Lothian, J. L.
Page Count	14
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) (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.
Keywords	Zirconium Plasma spraying Chemical vapor deposition Barrier coatings Thermal barriers Fabrication Solvents Vapor pressure Yttrium Microstructure Yttria stabilized zirconia
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Oak Ridge National Lab., TN.; Louisville Univ., KY.
Supplemental Notes	Prepared in cooperation with Louisville Univ., KY.
Document Type	Technical Report
NTIS Issue Number	200524