4J29 (Kovar Alloy) Heat Treatment for Semiconductor Packaging — Ensuring Dimensional Stability & Sealing Performance

The semiconductor industry demands materials that can withstand thermal cycling, vacuum environments, and hermetic sealing processes. One such critical material is 4J29 (also known as Kovar alloy) — a precision iron-nickel-cobalt alloy known for its low thermal expansion, which closely matches glass and ceramic materials used in semiconductor packaging.

However, raw alloy sheets often contain internal stress, surface oxidation, or warping, which can compromise bonding accuracy.

Normantherm addresses this with precision vacuum heat treatment and leveling, delivering:

• Stress-relieved alloy structure for stable sealing performance
• Flattened surfaces for tight assembly tolerances
• Oxidation-free finish suitable for glass-to-metal or ceramic-to-metal joining

By ensuring material consistency and post-treatment flatness, Normantherm helps semiconductor manufacturers achieve higher sealing reliability, longer component lifespan, and lower assembly defects. From sensor housing covers to IC package headers, our vacuum furnaces are engineered to deliver consistency at scale.