Abstract
Strength values of a sintered low temperature co-fired ceramic (LTCC) tape system were measured over four orders of magnitude of stressing rate in dry (<2% relative humidity (RH)) and in wet (98% RH) conditions using a ring-on-ring biaxial-flexure test. As expected, the strength of the material increases with increasing stressing rate, and with decreasing RH. These data are analyzed to obtain the empirical sub-critical crack growth (SCG) exponent, n. It was found that the n value in high RH environment was higher than that in the low RH environment. Fractographic examination was used to identify failure origins, which ranged from surface and sub-surface pores, partially densified surface regions, inclusions, surface damage and unidentified surface defects. The implications of our results for design with this novel material system are outlined.
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