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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.

Virtually all SPT test stands, which are operated in different laboratories, cause contact between different parts of the SPT due to the technical design. These frictional influences can lead to erroneous test results since the force transmitted from the punch to the sample is reduced. This influence can be considerable, particularly in the case of creep tests at high temperatures. The present work analyses various typical experimental setups and the influence of inaccuracies in the setup on the test results. Finally, some requirements and suggestions for an optimized experimental setup are derived.

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