Bestimmung der Warmhärte von metallischen und keramischen Hochtemperaturwerkstoffen

A new test facility for the measurement of the hardness at elevated temperatures will be described. The hardness (Vickers and Knoop geometry) can be measured between 300 °C and 1500 °C in vacuum. The tests were conducted with diamond indenter and test loads between 9.81 N and 294.30 N at a specific test temperature on polished cross sections. The evaluation of the high-temperature hardness was performed with optical microscopy after cooling down. Based on the measurement of the temperature dependence of the hardness of various ceramic and metallic materials, the potential and limits of this characterization method are shown. The evaluation of the high-temperature hardness was found to be a very effective method for the development of metallic and ceramic materials for use at elevated temperature conditions