Analysis on Welding Failure of Terminal Electrode of Multilayer Ceramic Capacitors by SEM

Aimed at the problem of welding failure of tin-coating in multilayer ceramic capacitors devices,we studied the microstructure and components of tin-coating with SEM and EDS.The welding failure modes occurred in the outer-electrode are demonstrated and the reason of failure are discussed.The results show that some abnormal regions on the tin-coating of samples with welding problem are produced by oxidation.The strict solderability test has verified the results of the analysis and according to the analysis im...