Braze Alloys
Nioro® (AMS 4787, BAu-4) Technical Information
High-purity gold and nickel alloy for vacuum brazing
Key Benefits
- Excellent wetting and flow properties
- Excellent resistance to oxidation
- Excellent strength and ductility
Typical Applications
- Aero-engines (OEM and repair)
- Aerospace fuel-line assemblies
- Vacuum tubes
- Wave guide and Klystron assemblies
- Power supply surge arrestors
- Automotive components
Nominal Composition by Weight
- Gold (Au): 82%
- Nickel (Ni): 18%
Suggested Base Materials
- Kovar, Copper, Carbon/low alloys & Tool/high speed steel, Stainless steel, Nickel, Ni-super alloys, Refractory metals
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Nioro® Thermal Properties |
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|---|---|---|
|
°C |
°F |
|
|
Liquidus |
955 |
1751 |
|
Solidus |
955 |
1751 |
|
Nioro® Physical Properties* |
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|---|---|---|---|---|
|
Metric |
Imperial |
|||
|
Coefficient of Thermal Expansion (CTE) |
17.5 |
x10-6/°C for 20-850°C |
9.7 |
x10-6/°F for 68-1562°F |
|
Thermal Conductivity (Calculated) |
28 |
W/(m*K) |
16 |
BTU/ft h °F |
|
Yield Strength (0.2% offset) |
686 |
MPa |
99.5 |
x103 lb/in2 |
|
Tensile Strength |
792 |
MPa |
115 |
x103 lb/in2 |
|
Elongation (2in/50mm gage section) |
12 - 15 |
% |
||
|
Electrical Resistivity |
274 |
x10-9(ohm*m) |
||
|
Electrical Conductivity |
3.7 |
x106/(ohm*m) |
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|
Recommended Brazing Atmospheres |
10-5 mm Hg, H2, 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.