Study on Intermittent Penetration Degradation Life Model of Metal-Glass Sealing Structure

Moisture is a major environmental factor that causes airtight failure under temperature cycling conditions. Increasing ambient moisture will accelerate metal-glass airtight intermittent penetration degradation. Glass insulators produce fine cracks due to reduced strength under temperature cycling conditions.Based on the molecular flow model, the formula for calculating the relationship between leak rate and crack depth and width is obtained. It is concluded that the leak rate is proportional to the cube of the crack width and inversely proportional to the micropore depth. The theoretical calculation results are less than 10% of the measured leak rate error.The moisture content converted from the liquid water of three monolayers was calculated, and the airtight HIC metal-glass sealing intermittent degradation life model with a certain leak rate was obtained.