Braze Alloys
Palniro® 4 (AMS 4785) Technical Information
High-purity gold, nickel and palladium alloy for vacuum brazing
Key Benefits
- High ductility
- High strength
- High oxidation resistance
- Recommended for brazing super alloys and stainless steels
- Similar to Palniro 4 but lower brazing temperature
Typical Applications
- Aero-engines (OEM and repair)
- Aerospace fuel-line assemblies
- Vacuum tubes
- Wave guide and Klystron assemblies
- Power supply surge arrestors
Nominal Composition by Weight
- Gold (Au): 30%
- Nickel (Ni): 36%
- Palladium (Pd): 34%
Forms Available
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Palniro® 4 Thermal Properties |
||
|---|---|---|
|
°C |
°F |
|
|
Liquidus |
1169 |
2139 |
|
Solidus |
1135 |
2075 |
|
Palniro® 4 Physical Properties* |
||||
|---|---|---|---|---|
|
Metric |
Imperial |
|||
|
Coefficient of Thermal Expansion (CTE) |
17.0 |
x10-6/°C for 20-1000°C |
9.6 |
x10-6/°F for 68-1832°F |
|
Density |
11.6 |
Mg/m3 |
0.419 |
lb/in3 |
|
Yield Strength (0.2% offset) |
655 |
MPa |
95 |
x103 lb/in2 |
|
Tensile Strength |
829 |
MPa |
120 |
x103 lb/in2 |
|
Elongation (2in/50mm gage section) |
28 |
% |
||
|
Electrical Resistivity |
162 |
x10-9(ohm*m) |
||
|
Electrical Conductivity |
3.7 |
x106/(ohm*m) |
||
|
Vapour Pressure (Calculated) |
2 |
10-6 mm Hg @ 1000°C |
2 |
10-6 mm Hg @ 1832°F |
|
2 |
10-5 mm Hg @ 1100°C |
2 |
10-5 mm Hg @ 2012°F |
|
|
Recommended Brazing Atmospheres |
10-5 mm Hg or inert gas |
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* Please note that all values quoted are based on test pieces and may vary according to component design. These values are not guaranteed in any way and should only be treated as indicative values. They should be used for guidance only and for no other purpose whatsoever.