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Thermal shock and thermal cycling behavior of silicon nitride ceramics

Thermoschock- und TWB-Verhalten von Siliziumnitrid-Keramik
: Kirchhoff, G.; Holzherr, M.; Bast, U.; Rettig, U.


Hoffmann, M.J.; Becher, P.F.; Petzow, G.:
Silicon Nitride 1993. International Conference on Silicon Nitride-Based Ceramics. Proceedings : Stuttgart, October 4 - 6, 1993
Brookfield: Trans Tech Publications, 1994 (Key engineering materials 89/91)
ISBN: 0-87849-668-8
International Conference on Silicon Nitride-Based Ceramics <1993, Stuttgart>
Conference Paper
Fraunhofer IWS ()
high-speed pyrometer; Hochgeschwindigkeitspyrometer; laser scanning; silicon nitride; Siliziumnitrid; thermal cycling; thermal shock; Thermoschock; zyklische thermische Belastung

In order to reproducibly characterize the thermal shock behavior of ceramic materials that are intended to be applied in stationary gas turbines, a fracture- mechanics-based test method is under development. The main feature of this technique is to generate a defined thermal gradient in a small sample by laser irradiation. The first application of this method to, Si3N4 is presented. It is shown that figures-of-merit being typical for a material can be determined. In the case of cyclic severe stresses failure occurs after a relatively small number of cycles. This may be explained by a large subcritical crack growth rate under cyclic stresses.