The effect of silica on the cyclic life of a zirconia-yttria thermal barrier coating

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:160427

Miller, R A; Brindley, W J; Goedjen, J G ^[1]; Tiwari, R ^[2]; Mess, D ^[3]

---

1. National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
2. Cleveland State Univ., OH (United States)
3. Cambridge Micro Tech, Inc., MA (United States)

The thermal cycling resistance of plasma sprayed zirconia-7wt% yttria thermal barrier coatings (TBCs) has been examined as a function of silica impurity level. Characterization of starting powders containing from 0.1 to 1.0 weight percent silica indicated there were no major differences in powder morphology or size. However, burner rig thermal cycling tests of coatings fabricated with these powders showed a dramatic increase in TBC cyclic life with decreasing silica level. The effect of silica content on TBC life is discussed in terms of coating microstructure, phase content and mechanical properties.

• OSTI ID: 160427
• Report Number(s): CONF-940684-; ISBN 0-87170-509-5; TRN: 96:006012
• Resource Relation: Conference: 1994 national thermal spray conference, Boston, MA (United States), 20-24 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of 1994 Thermal spray industrial applications: Proceedings; Berndt, C.C.; Sampath, S. [eds.] [State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering]; PB: 816 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ZIRCONIUM OXIDES
PLASMA ARC SPRAYING
THERMAL CYCLING
MICROSTRUCTURE
YTTRIUM OXIDES
HAFNIUM OXIDES
SILICA
SOL-GEL PROCESS
NICKEL ALLOYS
CHROMIUM ALLOYS
ALUMINIUM ALLOYS
YTTRIUM ALLOYS
PARTICLE SIZE
MORPHOLOGY
FATIGUE
CHEMICAL COMPOSITION
X-RAY DIFFRACTION
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
DENSITY
ROUGHNESS
STRESSES
CREEP