Advanced Ceramic Coatings and Interfaces II: Ceramic by Uwe Schulz, Hua-Tay Lin, Jonathan Salem, Dongming Zhu

By Uwe Schulz, Hua-Tay Lin, Jonathan Salem, Dongming Zhu

Papers from the yankee Ceramic Society's thirty first foreign convention on complex Ceramics and Composites, held in Daytona seashore, Florida, January 21-26, 2007. makes a speciality of fresh advances in coating improvement, processing, structural layout, microstructure and estate characterization, and existence prediction.

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The degradation of mechanical properties was caused by dispersed monazite-type LaPC>4 particles. Monazite-type LaP04 materials have poor mechanical properties and weak bonding between oxides10. Actually, mechanical properties of PECSed monolithic Advanced Ceramic Coatings and Interfaces II ■ 23 Thermal and Mechanical Properties of Zirconia/Monazite-Type LaP0 4 Nanocomposites Figure 5. % LaP04. 9 MPa of flexural strength. Young's modulus can not be measured by range error. Mechanical properties of 3YSZ/LaP04 nanocomposites were decreased due to dispersed monazite-type LaP04 particles.

This appears to be very thick for the low bondcoat temperature (< 980°C) and the short time at temperature (< 100 h). On the other hand the ß-phase depleted zone in the top of the bondcoat is very thin. A depleted zone is typically seen in TBC bondcoats as the TGO is mainly AI2O3 which is formed from the Al of the ß-phase (mainly NiAl). The reason for the thin depleted zone can be identified if the TGO is analyzed in more detail. Fig. 6 shows a SEM micrograph of a Advanced Ceramic Coatings and Interfaces II · 33 Corrosion Behavior of New Thermal Barrier Coatings YSZ/La2Zr207 system and an EDX spectra of the indicated area after cycling with NaCl addition.

W. Hobbs. American Ceramic Society, Columbus, OH, 1981 4 J. Katamura and T. , 46 [5], 1569-75(1998) 5 J. Ilavsky, J. K. Stalick, and J. Wallace, "Thermal Spray Yttria-stabilized Zirconia Phase Changes during Annealing", J. Therm. Spray Technol, 10 [3], 497-501 (2001) 6 J. R. Brandon and R. Taylor, "Phase stability of zirconia-based thermal barrier coatings Part 1, Zirconia-yttria alloys", Surf. Coat. Technol, 46, 75-90 (1991) 7 U. Schulz, "Phase Transformation in EB-PVD Yttria Partially Stabilized Zirconia Thermal Barrier Coatings during Annealing", J.

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