Abstract
We have studied the behavior of ionic impurities in the insulation layer of metal-base PWBs and carried out nondestructive detection of copper ionic migration using the pulsed electroacoustic method for measuring the space charge. Space charge polarization was observed initially and after pre-absorption under high-temperature, high-humidity conditions. It appears to be attributable to the ions present initially in the insulation layer. The space charge measurement detected a conductive region formed in the insulation layer near the anode after bias testing under high-temperature, high-humidity conditions (THB test). Element distribution analysis verified, it as a region of copper ionic migration. Growth of copper ionic migration in the insulation layer was detected nondestructively.
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