Want Reliable Welds? Hermetic Sealing Can Help

Hermetic sealing is the encapsulation of electronic components into an airtight metal or ceramic housing using either parallel gap resistance seam welding or opposed electrode projection resistance welding. It is a key manufacturing process used in assembling microelectronic packages for communication, aerospace, and medical device manufacturing.

Uses of Hermetic Sealing

Microelectronic devices are commonly used in industrial commercial communications, transportation, military, and aerospace industries and include optical sensors, pressure sensors, communications devices, thermal and laser imaging, and power amplifiers. By sealing these electronic packages, external contaminants—like moisture—are kept out preventing degradation of the electronic components inside and extending their lifetime.

Implantable medical devices, like pacemakers and defibrillators, also require careful hermetic sealing to protect both the device and the patient.

Microelectronic Package Types

There are two primary types of packages: metallic tub and ceramic.

The preferred material for metallic tub base packages is Kovar, which has a similar Coefficient of Thermal Expansion (CTE) as glass; the use of this material prevents the metal-to-glass seals of the feedthrough connectors of the package from leaking due to material expansion from heat generated during the welding process.

Ceramic packages are made of a ceramic substrate with a brazed metal seal ring. Kovar is also used in ceramic packages; the Kovar is brazed onto the ceramic base as a seal ring to which the lid is welded.

Read more: Want Reliable Welds? Hermetic Sealing Can Help