Braze Alloys
80Au-20Cu Technical Information
High-purity gold and copper alloy for vacuum brazing
Key Benefits
- Suitable for brazing assemblies of copper, nickel and Kovar (Ni-Co-Fe alloy)
- Widely used for brazing ceramic components that have been moly-manganese metallised
- High-integrity brazed joint duties in critical applications
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): 80%
- Copper (Cu): 20%
Forms Available
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80Au - 20Cu Thermal Properties |
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|---|---|---|
|
°C |
°F |
|
|
Liquidus |
910 |
1670 |
|
Solidus |
908 |
1666 |
|
80Au-20Cu Physical Properties* |
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|---|---|---|---|---|
|
Metric |
Imperial |
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|
Coefficient of Thermal Expansion (CTE) |
19.1 |
x10-6/°C for 20-850°C |
10.8 |
x10-6/°F for 68-1562°F |
|
Thermal Conductivity (Calculated) |
52 |
W/(m*K) |
30 |
BTU/ft h °F |
|
Density |
15.5 |
Mg/m3 |
0.55 |
lb/in3 |
|
Yield Strength (0.2% offset) |
613 |
MPa |
89.0 |
x103 lb/in2 |
|
Tensile Strength |
658 |
MPa |
95.5 |
x103 lb/in2 |
|
Elongation (2in/50mm gage section) |
4.5 |
% |
||
|
Electrical Resistivity |
131 |
x10-9(ohm*m) |
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|
Electrical Conductivity |
7.6 |
x106/(ohm*m) |
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|
Vapour Pressure (Calculated) |
1.4 |
10-9 mm Hg @ 700°C |
1.4 |
10-9 mm Hg @ 1292°F |
|
7.8 |
10-6 mm Hg @ 800°C |
7.8 |
10-6 mm Hg @ 1472°F |
|
|
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.