SilverAlloy BV-71
Nominal Chemical
Composition
INTRODUCTION
Aufhauser SilverAlloy BV-71 is a special alloy for vacuum brazing.
APPLICATIONS
SilverAlloy BV-71 is suitable for vacuum brazing applications at moderate temperatures, e.g. when assembling vacuum tube components. BV-71 contains a small amount of nickel which improves the wetting of the surface of ferrous metals at the expense of a slightly more sluggish flow.
GENERAL INFORMATION
Chemical Composition, Grade 1 (Grade 2)| Ag | Cu | Ni | Zn | Cd | Pb | P | C | Other volatile elements * |
|---|---|---|---|---|---|---|---|---|
| 71.5 ± 1.0 | Remainder | 0.5 ± 0.2 | < 0.001 (< 0.002) |
< 0.001 (< 0.002) |
< 0.002 (< 0.002) |
< 0.002 (< 0.02) |
< 0.005 (< 0.005) |
< 0.001 (< 0.002) |
Total volatile elements 0.01 max. Total non-volatile elements 0.05 max. (*) Elements with a vapor pressure higher than 10-7 torr at 932°F (500°C) such as Mg, Sb, K, Na, Li, Ti, S, Cs, Rb, Se, Te, Sr, and Ca.
ADDITIONAL INFORMATION
PHYSICAL and MECHANICAL PROPERTIES
| Solidus (Melting point) | 1436°F (780°C) |
| Liquidus (Flow point) | 1463°F (795°C) |
| Brazing temperature range | 1463-1650°F (795-900°C) |
| Density | 10.0 g/cm³ (5.27 troy oz/in³) |
| Electrical Conductivity, % IACS | 78.8 |
| Electrical Resistivity, 10-9 microhm-cm | 2.19 |
| Color | Silver white |
SPECIFICATIONS MEET or EXCEED |
| AWS A5.8/A5.8M BVAg-8b |
| UNS P07728 |
AVAILABLE FORMS |
| Powder/Paste |
| Wire, Strip |
| Specialty preforms per customer specifications |