How 4J29 Alloy Powder Ensures Precision in Hermetic Sealing and Electronic Packaging

4J29 alloy powder, also known as Kovar, is a precision iron-nickel-cobalt alloy widely used in electronic packaging and hermetic sealing. Its controlled thermal expansion closely matches that of borosilicate glass and ceramics, making it essential in aerospace, telecommunications, and microelectronics.

Controlled Thermal Expansion for Hermetic Integrity

4J29 offers a low and predictable coefficient of thermal expansion (CTE), enabling:

• Tight seals with ceramic and glass materials

• Prevention of thermal stress-induced cracking

• Long-term stability in high-reliability electronic components

Excellent Magnetic and Mechanical Properties

4J29 alloy powder also provides:

• Good magnetic permeability for shielding applications

• High dimensional stability under thermal cycling

• Sufficient strength and toughness for structural reliability

These features are critical in vacuum tubes, sensors, and hybrid microcircuits.

Engineered for Additive Manufacturing and Powder Metallurgy

HUAXIAO TECH produces gas-atomized 4J29 alloy powder with:

• High sphericity and flowability

• Narrow particle size distribution

• Compatibility with laser powder bed fusion (LPBF) and metal injection molding (MIM)

Application Areas

• Glass-to-metal and ceramic-to-metal seals

• Headers and housings in aerospace electronics

• Sensor packages, oscillators, and semiconductor enclosures

• Hermetic connectors in military and satellite systems

Benefits Summary

• Matched expansion to glass and ceramics

• High mechanical stability and magnetic shielding

• Excellent compatibility with powder-based processing

• Proven reliability in aerospace and electronic packaging

Frequently Asked Questions (FAQ)

Q1: What is the typical composition of 4J29?
A1: Approximately 29% Ni, 17% Co, balance Fe, with tight control to ensure CTE matching.

Q2: Is 4J29 suitable for additive manufacturing?
A2: Yes, our high-purity powder supports laser-based 3D printing and sintering technologies.

Q3: Can 4J29 be used in high-vacuum environments?
A3: Absolutely. It performs reliably in vacuum and high-temperature hermetic applications.

Conclusion

4J29 alloy powder provides unmatched performance in critical sealing and packaging applications. Its stable thermal expansion, mechanical integrity, and AM compatibility make it a cornerstone material in modern electronic and aerospace systems.

Contact HUAXIAO TECH for high-quality 4J29 alloy powder tailored to your manufacturing process.