# UNS C14181 (BVCu-1x) Vacuum Service Filler Metal

C14181 copper is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately high melting temperature and the highest thermal conductivity among copper-based braze fillers.

The graph bars on the material properties cards below compare C14181 copper to: copper-based braze fillers (top), all copper alloys (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.

## Mechanical Properties

Elastic (Young's, Tensile) Modulus

120 *GPa* 17 *x 10 ^{6} psi*

Elongation at Break

15 *%*

Poisson's Ratio

0.34

Shear Modulus

43 *GPa* 6.3 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

210 *MPa* 30 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

130 *MPa* 18 *x 10 ^{3} psi*

## Thermal Properties

Brazing Temperature

1090 to 1150 *°C* 2000 to 2100 *°F*

Latent Heat of Fusion

210 *J/g*

Maximum Temperature: Mechanical

200 *°C* 390 *°F*

Melting Completion (Liquidus)

1080 *°C* 1980 *°F*

Melting Onset (Solidus)

1080 *°C* 1980 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.092 *BTU/lb-°F*

Thermal Conductivity

380 *W/m-K* 220 *BTU/h-ft-°F*

Thermal Expansion

17 *µm/m-K*

## Otherwise Unclassified Properties

Base Metal Price

31 *% relative*

Density

9.0 *g/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

2.6 *kg CO _{2}/kg material*

Embodied Energy

41 *MJ/kg* 18 *x 10 ^{3} BTU/lb*

Embodied Water

310 *L/kg* 37 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

28 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

69 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.2 *points*

Stiffness to Weight: Bending

18 *points*

Strength to Weight: Axial

6.5 *points*

Strength to Weight: Bending

8.8 *points*

Thermal Diffusivity

110 *mm ^{2}/s*

Thermal Shock Resistance

7.4 *points*

## Alloy Composition

Cu | 99.9 to 100 | |

C | 0 to 0.0050 | |

P | 0 to 0.0020 | |

Pb | 0 to 0.0020 | |

Zn | 0 to 0.0020 | |

Cd | 0 to 0.0020 |

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