Why are ceramic electronic packages sealed in hydrogen or hydrogen-nitrogen atmospheres?

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advanced ceramics Steps in doctor blading, a tape-casting process employed in the production of ceramic films. Ceramic powder and solvent are mixed to form a slurry, which is treated with various additives and binders, homogenized, and then pumped directly to a tape-casting machine. There the slurry is continuously cast onto the surface of a moving carrier film. The edge of a smooth knife, generally called a doctor blade, spreads the slurry onto the carrier film at a specified thickness, thereby generating a flexible tape. Heat lamps gently evaporate the solvent, and the dry tape is peeled away from the carrier film and rolled onto a take-up reel for additional processing.

Ceramic electronic packages are cofired in hydrogen or hydrogen-nitrogen atmospheres specifically to prevent the tungsten or molybdenum metallization lines from oxidizing during the high-temperature manufacturing process.1

When these advanced ceramics are processed at temperatures reaching 1,600° C (2,900° F), the protective gas environment ensures the integrity of the internal conductive pathways, allowing for the creation of a monolithic package that houses integrated circuits in a stable, hermetically sealed environment.1