FAILURE BEHAVIOR OF CERAMICS FOR GYROTRON WINDOWS

The failure behavior of ceramic windows for gyrotron tubes is governed by the inert strength and, in the presence of subcritical crack growt h, by the parameters of the crack growth power law. A number of cerami c materials (aluminas of different impurity, alumina with zirconia, al uminum nitride, and sapphire) have been investigated. The results are reported as Weibull plots for the strength, nu-K curves for the subcri tical crack growth behavior; and da/dN-Delta K curves for cyclic fatig ue. Relations, necessary for lifetime predictions, are compiled at the end.