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TECHNICAL PAPERS

Compressive Fatigue of a Plasma Sprayed Zr02-8 wt%Y203 and Zr02-10wt%NiCrAlCoY TTBC

[+] Author and Article Information
B. P. Johnsen, T. A. Cruse

Mechanical Engineering Department, Vanderbilt University, Nashville, TN 37235

R. A. Miller, W. J. Brindley

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH 44135

J. Eng. Mater. Technol 117(3), 305-310 (Jul 01, 1995) (6 pages) doi:10.1115/1.2804544 History: Received May 12, 1994; Revised July 09, 1994; Online November 27, 2007

Abstract

High cycle (>106 cycles) fatigue (HCF) behavior of thick thermal barrier coatings (TTBC’s) was examined for applied stresses near the compressive strength of the material. Test data were obtained on four coating systems: two base materials in the unsealed and CrO2 dip sealed conditions. Free standing tubular specimens were evaluated. The data show that compressive fatigue limits exist for the four coating systems at room temperature (RT) and sealing with CrO2 improves RT fatigue life. Test results also show the ratio of the peak cyclic stress, at 105 cycles, to ultimate compressive strength (UCS) of the Yttria Stabilized Zirconia (YSZ) tubular specimens approaches 0.90 at R = 0.6 (R = minimum/maximum compressive stress). Residual UCS increases were observed after fatigue run-outs at elevated temperatures (5 at 700°C and 1 at 400°C) for both YSZ and the cermet. Ratchetting with cyclic hardening was observed during fatigue with deformation occurring primarily in the initial portion of the high cycle fatigue life of the specimens.

Copyright © 1995 by The American Society of Mechanical Engineers
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