Expansion Alloy Super 4j29 Invar 36 Rod - China

What is Expansion Alloy 4J29 Invar 36 Rod? 钴基合金棒 (1) Precision Alloy Expansion Alloy Super 4J29 Invar 36 Rod is a controlled-expansion iron-nickel-cobalt alloy renowned for its exceptional thermal expansion compatibility with hard glass and ceramics.

4J29 maintains near-zero dimensional variance across extreme temperature fluctuations, establishing itself as the gold standard for hermetic sealing in critical applications.

This alloy bar also exhibits outstanding resistance to thermal stress cracking and corrosion in vacuum environments.

Precision Alloy Expansion Alloy Super 4J29 Invar 36 Rod is particularly valued for its unique thermal expansion synchrony and impermeable sealing capabilities.

A defining characteristic is its engineered crystallographic structure that remains geometrically stable from cryogenic to elevated temperatures, enabling the fabrication of precision components requiring micron-level tolerance retention during thermal cycling.

COBALT-BASE ALLOY BAR Characteristics of Kovar Alloy 4j29 Bar 1 - Precision Thermal Expansion Matching Maintains near-zero differential expansion with hard glass/ceramics across -60°C to +450°C, eliminating interfacial stress-induced sealing failures.

2 - Hermetic Sealing Integrity Creates impermeable metal-to-nonmetal joints sustaining helium leak rates <10⁻⁹ Pa·m³/sec under vacuum/high pressure, ensuring lifetime sealing reliability.

3 - Multi-Environment Stability (1) Thermal Shock Resistance:

Forms a dense, stable chromia (Cr₂O₃) protective layer at high temperatures, resisting oxidation in air or oxygen-containing environments.

(2)Ultra-High Vacuum Compatibility:

Zero outgassing in critical vacuum environments.

(3)Corrosion Resistance:

Resists weak acids, alkaline vapors, and electronic cleaning agents.

4 - Lattice-Driven Dimensional Invariance Precisely tuned Fe-Ni-Co atomic ratio stabilizes crystal structure below/above Curie point (~430°C), enabling micron-level dimensional reproducibility during thermal cycling.

5 - Machinability-Strength Balance Optimized annealed microstructure delivers unified mechanical strength and ductility, supporting complex machining while ensuring thin-wall seal rigidity.

6 - Sealing Interface Affinity

(1) Glass Fusion Bonding:

Forms chemical-bonded interfaces with borosilicate glass for hermetic seals.

(2)Metal Weldability:

Compatible with TIG/electron beam welding for hybrid sealing structures.

Company Contact:

• Posted By: DLX ALLOY

• Phone: 13218680935

• Address: 新北区太湖西路 , 常州 , 江苏 , China

• Email:

• Website: https://www.dlxalloys.com/

• Business Description: Established in 2002, Over 22 years of industry experience in providing OEM/ODM services Location: Zhenjiang Industrial Park, Jiangsu Province, covers an area of about 12,000 square meters.
  
  Annual output: The total output of alloy material is about 1200 tons, the main products include electric heating alloy material, high temperature alloy, special nickel-based welding wire, furnace bar, etc.