AWS BVAu-8 (P00927) Vacuum Service Filler Metal
AWS BVAu-8 is a gold-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAu-8 is the AWS designation for this material. P00927 is the UNS number.
It has the highest density among gold-based braze fillers. In addition, it has the highest melting temperature and the lowest heat capacity.
The graph bars on the material properties cards below compare AWS BVAu-8 to: gold-based braze fillers (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Thermal Properties
Brazing Temperature
1240 to 1270 °C 2260 to 2330 °F
Latent Heat of Fusion
71 J/g
Melting Completion (Liquidus)
1240 °C 2260 °F
Melting Onset (Solidus)
1200 °C 2190 °F
Specific Heat Capacity
140 J/kg-K 0.033 BTU/lb-°F
Thermal Expansion
14 µm/m-K
Other Material Properties
Density
19 g/cm3 1170 lb/ft3
Elastic (Young's, Tensile) Modulus
100 GPa 15 x 106 psi
Poisson's Ratio
0.42
Shear Modulus
36 GPa 5.2 x 106 psi
Tensile Strength: Ultimate (UTS)
140 MPa 20 x 103 psi
Common Calculations
Stiffness to Weight: Axial
3.0 points
Stiffness to Weight: Bending
8.3 points
Strength to Weight: Axial
2.1 points
Strength to Weight: Bending
3.2 points
Thermal Shock Resistance
7.1 points
Alloy Composition
| Au | 91 to 93 | |
| Pd | 7.0 to 9.0 | |
| C | 0 to 0.0050 | |
| P | 0 to 0.0020 | |
| Pb | 0 to 0.0020 | |
| Zn | 0 to 0.0010 | |
| Cd | 0 to 0.0010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding