Glass And Metal Sealing

Glass and metal sealing involves various methods for securely joining glass components with metal components, crucial for applications requiring hermetic seals in industries like automotive, aerospace, electronics, and medical devices. Fusion sealing employs high temperatures to melt the glass, forming a strong bond upon cooling, commonly utilized in electrical feedthroughs. Adhesive bonding utilizes specialized adhesives to withstand thermal expansion differences between materials, ideal for applications not requiring high-temperature sealing. Intermediary materials like solder or brazing alloys can join glass and metal at lower temperatures without harming the glass. Sealing glasses with similar thermal expansion coefficients to metal are used to create hermetic seals in electronic packages and sensors. Compression seals involve mechanically pressing metal against glass for tight seals, advantageous in industrial settings requiring high mechanical strength. Selection criteria include application requirements, operating conditions, material properties, thermal expansion coefficients, chemical compatibility, and desired hermeticity level.