As a series of material approaches to the development of advanced technology for Stirling converters for space power applications, two commercial, structural silicon nitrides AS800 and SN282 were downselected. Their life limiting property was characterized through slow crack growth testing in flexure at an intermediate temperature of 1050 deg C in air. AS800 exhibited both fast-fracture strength and Weibull modulus greater than SN282. However, life limiting phenomenon was apparent in AS800 with a low slow crack growth parameter n = 15; whereas, a much increased resistance to slow crack growth (n >150) was found in SN282. The life limiting property of both silicon nitrides was found to be consistent either in dynamic fatigue (constant stress-rate) loading or in stress rupture (constant stress or static fatigue).
Life limiting behavior of two gas-turbine grade silicon nitrides at intermediate temperature for stirling convertor applications
Lebensdauerverhalten zweier Siliciumnitride mit Gasturbinengütegrad bei intermediärer Temperatur für Stirlingkonverter-Anwendungen
2007
11 Seiten, 5 Bilder, 1 Tabelle, 25 Quellen
Conference paper
English
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