| Silvaloy
15 (BCuP-5) |
 |
| Nominal
Composition: |
|
|
| Silver |
|
15.00
± 0.50% |
| Phosphorus |
|
5.00 ± 0.20% |
| Copper
|
|
Balance |
| Total
other elements |
|
0.15%
Max. |
| Physical
Constants: |
|
|
| Solidus |
|
1190°F
(643°C) |
| Liquidus |
|
1475°F
(802°C) |
| Brazing
Range |
|
1300-1500°F
(704-816°C) |
| Specific
Gravity |
|
8.44 |
| Density
(lb/cu in) |
|
0.305 |
| Electrical
Conductivity (% IACS) |
|
9.9 |
| Electrical
Resistivity (Michrohm-cm) |
|
17.4 |
| Color |
|
Light
Copper |
DESCRIPTION:
Silvaloy 15 is used for the brazing of
copper and copper alloys, brass and bronze. It can also be used
on silver, tungsten and molybdenum. It is very effective for joining
pipe and tubing and is widely used for electrical work. Silvaloy
15 should not be used on ferrous metals or copper alloys containing
more than 10% nickel because of phosphorous embrittlement due
to reactions with iron or nickel. Of the phos-copper brazing filler
metals, Silvaloy 15 has more ductility and better electrical conductivity
than the lower silver content phos-coppers. It has good flow and
wetting properties on copper, brass and bronze. Of the phos-copper
filler metals, Silvaloy 15 has the most “sluggish” flow characteristics.
This enables it to fill gaps better. The recommended joint clearances
are between 0.001: and 0.005”. Melting of Silvaloy 15 is virtually
complete at 1300°F (704°C) even though the liquidus is not yet
reached. Best results are obtained when brazing slightly above
this temperature.
PROPERTIES
OF BRAZED JOINTS:
Generally, the joint strength using Silvaloy
15 will surpass the strengths of the base metals. Strength is
a function of the base metals being joined, type of joint, design
of joint, joint clearances and brazing procedures. The recommended
maximum operating temperatures for Silvaloy 15 are 300°F (continuous
service) and 400°F (short time service). Corrosion resistance
is satisfactory except when the joint is in contact with sulfurous
atmosphere (especially at elevated temperatures).
APPLICATIONS:
The phosphorus content of Silvaloy 15 acts
as fluxing agent and no flux is necessary when brazing copper
to copper joints. However, when used with a copper alloy or one
of the other brazeable metals, a brazing flux must be used to
promote wetting, bonding and flow throughout the joint, The flux
used must be active within the required temperature range of Silvaloy
15 and active throughout the heating cycle. The flow point of
Silvaloy 15 is 1300°F (704°C).
| SPECIFICATIONS: |
|
AWS
A5.8
|
BCuP-5 |
| ASME |
BCuP-5 |
| QQ-B-650
|
BCuP-5 |
| Mil-B-15395 |
Grade
III |
| QQ-B-654 |
BCuP-5 |
SAFETY
INFORMATION:
The operation and maintenance of brazing
equipment or facility should conform to the provisions of American
National Standard (ANSI) Z49.1, “Safety in Welding and Cutting.”
For more complete information, refer to the Material Safety Data
Sheet for Silvaloy 15.
AVAILABLE
FORMS:
Standard Forms of Silvaloy 15 are wire,
strip, and preforms.
|
