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An acceleration model is presented for insulation failure between biased adjacent lands of a ternary Ag-Au-Pd alloy conductor paste on alumina substrates. The failure mechanism consists of silver diffusing in the form of tree-like dendrites through borosilicate glass overlays. Accelerated life test results, maximum likelihood estimation techniques, multiple linear regression analysis, and a previously proposed physical chemical model were used to derive the acceleration model. The activation energy of "dry" silver migration which was estimated to be 1.09 ±0.16 eV was in good agreement with previous studies of this Phenomenon.A comparison of reliability is made between this ternary alloy and a binary Ag-Pd alloy. The comparison shows the enhanced reliability of the ternary alloy, which may be due to the presence of gold in its formulation.
Components, Hybrids, and Manufacturing Technology, IEEE Transactions on (Volume:5 , Issue: 4 )
Date of Publication: Dec 1982