Residual Stress Characteristics of Ceramic Coatings and Their Cracking Behavior
The residual stress of metal-to-ceramic laminates (stabilized ZrO2/Nb and Al2O3/Nb) produced by solid state bonding was studied using finite element method (FEM) analysis. The results indicated that the dimensionless residual stress at the ceramic coatings decreased with increasing coating thickness ratio, (hc/hs), and elastic modulus ratio, (1-μs)Ec/[(1-μc)Es].
Further, using the results of residual stress analysis and the bending strength of sintered stabilized ZrO2 and Al2O3 the critical temperature for coating to prevent cracking was estimated. The analytical results were in good agreement with the cracking behavior of HIP treated ceramic coatings, but in the case of Al2O3 coated specimens, the dependence of cracking on HIP temperature was not in agreement with the analytical results, because of the phase transformation of the Al2O3 coating.
KeywordsResidual Stress Bonding Strength Critical Temperature Compressive Residual Stress Ceramic Coating
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