Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

High temperature probe for TBC properties

Quantitative understanding of the mechanical properties of TBCs is essential to the elucidation of failure mechanisms and the development of performance and life prediction models. While information existed on the behaviour of TBC materials in bulk form, the property database for coatings was much more limited, especially regarding high temperature constitutive properties and fracture toughness. The problem acquired special urgency because of early evidence that most alternate materials exhibited substantially lower durability than the standard 7YSZ both against particle erosion as well as against spallation in furnace cycle tests.

A new technique for high temperature testing of columnar coatings was developed within HIPERCOAT, as well as a model needed for interpreting the results. The test involves a hot impression of a coating deposited on a suitably rigid substrate, e.g. Al2O3, with a sapphire sphere, measuring the load-displacement curve from which the yield properties are subsequently calculated by deconvolution using the model. An additional advantage is that the densified zone under the hot impression can be sectioned and used to evaluate the fracture toughness of the material by indentation tests. The test has been applied to various coatings produced both in industry as well as in the academic laboratories involved in HIPERCOAT.

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Reported by

University of California, Santa Barbara
2361A Engineering II, Materials Department
93106-5050 Santa Barbara, California
United States
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