Zirconium 62 Active

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INTRODUCTION


Aufhauser Zirconium 62 Active is a low-erosion, corrosion resistant, filler metal foil, in roll form, for brazing: titanium alloys, titanium aluminides, refractory metals, ceramics, aluminum oxides (sapphire), graphite, carbon-carbon composites, titanium to copper, and titanium to stainless steel. This filler metal provides extremely high corrosion resistance in brazed joints, due to the absence of copper and silver.


APPLICATIONS

  • Heat exchangers
  • Fuel pipelines
  • Medical instruments or implants
  • Honeycomb panels
  • Fuel cells
  • Compressor rotors
  • Electronic devices
  • Cooling systems of divertors

DURABILITY

Aufhauser Zirconium 62 Active foil has been tested to provide a reliable 500-hour working-life when subjected to corrosive atmospheres with temperatures up to 550°C (1022°F). If temperatures rise above 650°C (1200°F), the joint will fail after approximately one hour. The cause of failure usually is differential coefficients of thermal expansion between stainless steels and ceramics and ceramic-like oxides. Proper joint design may reduce this problem.

 

Chemical Composition
Zirconium Nickel Titanium Hafnium
59 - 65 19 - 21 16 - 18 0.1 - 1.5
PHYSICAL and MECHANICAL PROPERTIES
Liquidus 1495°F (813°C)
Solidus 1465°F (796°C)
Brazing temperature for joining:  
  • Titanium or Nirobium
  • 1562-1598°F (850-870°C)
  • Ceramics, Graphite, Sapphire, Carbon composites
  • >1652°F (>900°C)
    Density ~6.72 g/cm3 (~0.24 lb/in3)
    Coefficient of thermal expansion 8.8 x 10-6 m/[m•°C-1] (4.9 x 10-6 in/[in•°F-1])
    Brazing in vacuum 10-4 Torr or better
     
    STANDARD SIZES AND FORMS
    Thickness Widths
    50 +/- 5 microns (0.002 inches) 50 mm (2 inches),
    75 mm (3 inches)