Strength and reliability properties of glass frit bonded micro packages

The hermetic package is one crucial element to ensure high reliability and lifetime of micro mechanical sensors in automotive applications. In a proactive approach fundamental reliability limiting effects are investigated. The bond quality of aged samples is characterised by Weibull analysis of tensile tested samples. By FE analysis the three dimensional stress distribution in the bond frame during tensile testing is evaluated using the maximum principal stresses determined by experimentally obtained fracture forces. The Micro-Chevron-Test is applied for the first time to samples containing an intermediate glass frit layer. A meandering crack path is observed and the fracture toughness is determined.