By Narendra B. Dahorte, Janet M. Hampikian, John E. Morral
This convention court cases makes a speciality of processing and characterizing high-temperature coatings in regards to engineering, actual, and chemical homes. It comprises the synthesis of recent and unconventional coating fabrics and addresses a variety of present equipment besides novel and cutting edge strategies of manufacturing coatings and their applications.Content:
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Additional info for Elevated Temperature Coatings: Science and Technology IV
Example text
The HTXRD data in Figure 7 show that α-Α1203 formed at the expense of κΑ1203 between 4 and 12 minutes into the annealing step. In addition to the κ- to α-Α1203 transition, the Pt3Al peak disappeared as most of the Pt3Al phase was dissociated back to Pt in about 90 minutes. The results certainly showed that the phase transformation behavior was rather complex. Upon annealing, the faceted surface features of the coating became smoother and more nodular as shown in Figure 6c. The highly faceted, jagged edges observed in the as-deposited cross-section (Figure 6b) became flat after annealing (Figure 6d).
R. E. Y. G. Wright, J. , 6(2), 1997,187. 4. Y. Lee, Y. G. A. K. Liaw, "Effects of Sulfur Impurity on the Scale Adhesion Behavior of a Desulfurized Ni-Based Superalloy Aluminized by Chemical Vapor Deposition, Metall. Trans. A, 29A (1998) 833-841. 5. M. Gell, E. Jordan, K. Vaidyanathan, K. McCarron, B. Barber, Y. Sohn, V. Tolpygo, Surf. Coat. Technol.. 120-121 (1999) 53-60. 6. K. R. Clarke, Mater. High. Temps.. 17(1), 2000, 59-70. 7. A. Haynes, Y. Y. A. G. M. M. B. Dahotre, TMS, 1999. 8. K. R. , 48, 13 (2000) 3283-3293.
It is generally agreed that the integrity of state-of-the-art TBC systems fabricated by EB-PVD is critically dependent on the properties and performance of the underlying metallic bond coat [4,5]. The bond coat, which is either (Ni,Pt)Al or a NiCoCrAlY, forms an oxide during fabrication of the Y2O3-Z1O2 (YSZ) top coat by the high temperature EB-PVD process. This reaction product is primarily AI2O3, which serves as a slow-growing diffusion barrier that protects the underlying metal. The CÍ-AI2O3 polymorph is the preferred phase for a protective oxide, due to its slow growth rate and chemical inertness.
