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Lucas-Milhaupt BRAZE 720 Silver Based Cadmium Free Filler Metal

Category Metal , Nonferrous Metal , Precious Metal , Silver Alloy , Solder/Braze Alloy
Manufacturer Lucas-Milhaupt
Trade Name BRAZE
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Lucas-Milhaupt BRAZE 720 Silver Based Cadmium Free Filler Metal.pdf
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Material Notes:
Characteristics:Brazing 720 is the silver-copper eutectic composition and in melting it acts like a metallic element, i.e. it melts completely at a single temperature, thus it will quickly flow into long narrow joints. On either silver base of copper base alloys, Braze 720 exhibits a decreased fluidity and an increased remelt temperature due to the solution of either silver or copper in the eutetic. Brazing time and temperature should be minimized to prevent excessive diffusion and erosion of the base metal. This filler metal has limited wetting ability on iron and/on nickel base alloys. The wetting ability it does have is derived from its copper content. Both iron and nickel have practically no solubility in silver, while nickel is readily soluble in copper and the solubility of iron in copper is sufficient to provide wetting. It is an observed fact that the wetting obtained in good hydrogen atmospheres is superior to that derived from flux protection. Applications: Braze 720 is generally used to join silver, copper and nickel base alloys in reducing or inert atmospheres or vacuum. It is also widely used to join metallized ceramics to metals in vacuum. Specifications: This filler metal conforms to the following specifications: AWS A5.8 BAg-8, ASME Boiler & Pressure Vessel Code, Sec. II-C, SFA 5.8 BAg-8 Information provided by Lucas-Milhaupt, Inc.
Physical Properties Metric English Comments
Density 9.96 g/cc
0.360 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength at Break 207 - 241 MPa
30000 - 35000 psi
Copper butt joint
241 - 276 MPa
35000 - 40000 psi
Nickel-Silver butt joint
241 - 345 MPa
35000 - 50000 psi
Brass butt joint
Thermal Properties Metric English Comments
Melting Point 779.4 °C
1435 °F
Solidus 779.4 °C
1435 °F
Melting Point
Liquidus 779.4 °C
1435 °F
Flow Point
Component Elements Properties Metric English Comments
Copper, Cu 26.85 - 28.85 %
26.85 - 28.85 %
Other, each 0.15 %
0.15 %
Silver, Ag 71 - 73 %
71 - 73 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.00000220 ohm-cm
0.00000220 ohm-cm
Processing Properties Metric English Comments
Processing Temperature 788 - 927 °C
1450 - 1700 °F
Brazing Range
Descriptive Properties Value Comments
Color White
Corrosion Resistance 0.28 Mgs/dcm2/Day
Wet/Ammonia Gas, room temperature, closed container
nil
Dry Ammonia Gas, room temperature, closed container
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