Abstract
The impact of thermal shock upon the scatter of flexural strength data of free-standing thin flame-sprayed Al2O3 coatings was examined. As published in the literature, thermally sprayed ceramic systems exhibit superior thermal shock resistance and against this background, the statistical evaluation of strength data prior and after the thermal shock was intensified. Thus, the Weibull parameters m and σ0 were compared before and after thermal shock from 1000 °C to room temperature. The flexural strength was determined utilising the ball-on-three-balls method. Although the general scale of the Weibull modulus m was rather low (< 6), considerable differences were shown after thermal shocking as the Weibull modulus decreased by a factor of about 3.
Highlights
Thermally sprayed ceramic coatings gained raised attention. Potential applications range from electrical components to high-temperature applications such as metal melt filtration
Nowadays, thermally sprayed ceramic coatings gained raised attention
Since SEM-micrographs of flame-sprayed alumina, presented in the literature, show a pronounced network of microcracks though, it is assumed that the majority of these cracks would appear smaller in extension than the resolution of the tomography scans would allow for visualisation (Ref 2)
Summary
Thermally sprayed ceramic coatings gained raised attention. Potential applications range from electrical components to high-temperature applications such as metal melt filtration. Abstract The impact of thermal shock upon the scatter of flexural strength data of free-standing thin flame-sprayed Al2O3 coatings was examined. A first indicator for their thermal shock performance can be found as all specimens survived the quenching from 1000 °C without rupture and could be tested for flexural strength.
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