The distribution of large-area metallization patterns is an important factor that affects the degree of warpage of the final product. The single-sided metallized porcelain is the most deformed. The reason is that the metallization shrinkage stress is greater than the ceramics shrinkage stress. bending. The mechanism is that during the sintering process, the metallized internal glass phase and the glass phase in the ceramic substrate interpenetrate, so that the interface between the two contains more glass phase relative to the inside. The shrinkage of this glass screen printing phase is larger than the crystal grains in the ceramic matrix. Shrinkage, so the tiles bend in the direction of metallization. The flatness of the porcelain pieces sintered with the metallized face down has been improved. This is because the porcelain pieces are softened at high temperatures, and the tendency of the center to arch upwards and bends is reduced by the gravity of the porcelain pieces themselves; and the metallization During the shrinking process, the layer was simultaneously rubbed by the underlying molybdenum plate, and ferrous sulfate heptahydrate counteracted part of the unbalanced shrinking stress. When the porcelain parts are severely warped, press the surface to smooth and smooth molybdenum plate, and re-fired once under the condition of sintering temperature, which can improve the flatness and meet the requirements of use. Therefore, proper control of the shrinkage matching of the green ceramic tape, control of the sintering system, rational design of the metallization pattern distribution to make it as uniform as possible, and the appropriate leveling process can ensure that the warpage of the porcelain is less than 1 ‰. For the electric vacuum device shell is PGA type plug-in parts, it is required to have a high bonding strength between the metal parts and the ceramics in order to meet the use requirements. The metallization strength directly affects the sealing strength and airtightness. As the main cause of sealing failure, the metallization strength is judged according to the sealing strength.
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