Glass-to-metal sealing refers to heating the pre-oxidized metal or alloy together with the sealing glass to a specific temperature to achieve a good wetting effect and tightly bond together, and then when the sealing part is cooled to room temperature, the metal and glass can still be Sealed together tightly and firmly, and meet certain performance requirements, such as air tightness, insulation, mechanical properties, etc.

With the rapid development of the electronics industry and the rapid development of various electronic products, glass-metal sealing technology has received more and more attention in various electronic components and semiconductor industries. Compared with traditional plastic sealing, glass has mechanical properties, aging resistance, high temperature resistance and insulation properties that plastics can’t match. Therefore, the sealing glass is indispensable to meet the high performance requirements of the product. Common metal materials used for sealing include: Kovar metal, iron-nickel alloy, Dumagnesium wire, oxygen-free copper, aluminum alloy, iron-chromium alloy, titanium alloy tungsten, molybdenum, tantalum, etc.

Theoretically, different metals or alloys have different expansion coefficients, and glass with matching expansion coefficients is required for sealing. This type of sealing is called matching sealing. With the continuous improvement of the sealing process, it is also possible to perform non-matching sealing of metal and glass with different expansion coefficients.