Analysis of the Degradation Sealing Performance Related for Sealed Switch Apparitors Based on Physical-Chemical Equations and Thermal Simulation

For life prediction of Sealed Switch Apparitors (SSA), degradation rate is a critical parameter in traditional computational models such as the Arrhenius model, which can be influenced directly by activation energy for sealing performance. To describe the degradation of SSA products with different sealing properties more accurately, this paper analyzes residual gases within a typical metal hermetically sealed SSA. Tests are conducted before and after life testing, and based on the presence of excess O2 and H2O, the generation process and physical-chemical changes during the switching process are analyzed. Based on the temperature sensitivity of certain physical-chemical equations, thermal effects—a critical factor in chemical reactions—are simulated and analyzed, and the results are compared with test data. This research validated the theoretical inferences regarding the primary reaction equations and provided basic recommendations for manufacturing process improvements based on both theoretical and simulation analyses.