Lucas-Milhaupt PREMABRAZE® 140 Gold-Copper Braze Alloy

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Lucas-Milhaupt PREMABRAZE® 140 Gold-Copper Braze Alloy
Categories:	Metal; Nonferrous Metal; Copper Alloy; Solder/Braze Alloy
Material Notes:	Alloy Premabraze 140 is a high-purity gold/copper alloy which is commonly used in vacuum brazing. Premabraze 140 can be used on any of the common ferrous and non-ferrous alloys – which may include copper, nickel and Kovar. This alloy exhibits good wetting characteristics on metallized ceramics. Typical applications include brazing of electron tubes, vacuum tubes, radar devices, wave guides in the electronic industry, and other aerospace applications. Premabraze 140 is readily used in the brazing of ceramic to metal seals. Premabraze 140 is generally used in reducing, vacuum, or inert atmospheres. The composition of the alloy allows for use in applications where braze filler metals low in volatile constituents are required. Due to its narrow plastic range, Premabraze 140 exhibits free flowing characteristics. Available forms: Wire, strip, engineered preforms, specialty preforms, powder and paste. Information provided by Lucas-Milhaupt.
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Physical Properties	Original Value	Comments

Specific Gravity	11.39 g/cc
Density	0.411 lb/in³

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000850 ohm-cm	20.3% IACS

Thermal Properties	Original Value	Comments
Melting Point	1796 - 1832 °F
Solidus	1796 °F
Liquidus	1832 °F

Processing Properties	Original Value	Comments
Processing Temperature	1832 - 1932 °F	Brazing Range

Component Elements Properties	Original Value	Comments
Cadmium, Cd	<= 0.0010 %
Carbon, C	<= 0.0050 %
Copper, Cu	59.5 - 64.5 %	Remainder
Gold, Au	39.5 - 40.5 %
Lead, Pb	<= 0.0020 %
Other, each	<= 0.0010 %	High vapor pressure elements.
Other, total	<= 0.010 %	high vapor pressure elements (Including zinc, cadmium, and lead)
Phosphorus, P	<= 0.0020 %
Zinc, Zn	<= 0.0010 %

Descriptive Properties
Color	Red brass

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NLUCM9828 / 254773

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