ZirconiumAlloy Z-62Zr-Active
Nominal Chemical
Composition
INTRODUCTION
Aufhauser ZirconiumAlloy Z-62Zr 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 ZirconiumAlloy Z-62Zr-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 (wt %)
| 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: | |
| 1562-1598°F (850-870°C) | |
| >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) |