Manufacturing method for ceramic pins

Ceramic pin case is widely used in high reliability package of power electronic devices, such as typical To254, To256 series package. There are generally two types of sealing forms for the pin of this type of encapsulation shell, one is end sealing and the other is shaft sealing. Both of these sealing forms have a certain proportion of air tightness problems in the production process.

For the end sealing structure, the ceramic pin is formed by the surface metallization welding between the welding ring and the porcelain part. Meanwhile, the gap between the pin and the welding ring is filled by silver copper solder, forming the sealing structure of the welding ring, the porcelain part and the pin. In this structure, due to the difference in thermal expansion coefficient between porcelain parts, welding ring and pin, the metallized edge of welding ring and porcelain parts is stressed greatly in the process of heating and cooling in high temperature welding, which is easy to be pulled apart by solder, resulting in the problem of air tightness.

For the shaft seal structure, the metallization and lead pins in the porcelain parts are filled with silver copper solder, which directly forms the gas seal connection. This type of sealing requires very high clearance accuracy between the hole and the pin. Too narrow clearance pin can not be inserted smoothly, so it can not be assembled and welded; If the gap is too wide, the solder cannot be filled, resulting in welding holes. And the slight fluctuation of the gap size will also cause the amount of solder can not be accurately controlled, resulting in air tightness problems.

Because electronic force electronic devices are widely used in military, rail transit, automobile and other power conversion fields, the demand is very large. Therefore, to improve the airtight reliability of this type of enclosure has a good application prospect and social benefits.

The above is an introduction to the manufacturing method of ceramic pin. I hope it will be helpful to you. I am Zhejiang Jingpeng Zirconium Industry Technology Co., LTD. If you want to know more about it, please feel free to contact us.