OROBRAZE  filler metals

Gold-copper OROBRAZETM filler metals show good wetting on Fe, Ni, Co, Ta, Nb and W. In general, these high purity filler metals show good resistance to oxidation at elevated temperatures and excellent corrosion resistance in many chemical environments. They are suitable for use in the fabrication of vacuum tube / thermionic valve devices as both gold and copper have low vapour pressures under the elevated temperature and levels of vacuum seen in such items. And they can be manufactured such that they contain only minimum levels of volatile elements, and can therefore be supplied to meet the requirements of EN 1044 - V1 grade (vacuum grade 1 materials).

They can produce ductile joints without excessive inter-alloying/erosion of the parent metals - advantageous when brazing thin walled structures. They form small radius smooth fillets at the joint edges.

All the gold-copper OROBRAZE filler metals have relatively short melting ranges and free flowing characteristics, with varying melting ranges allowing their use in step brazing operations. Typical joint gaps are between 0.025-0.1mm depending on parent materials and joint configuration.

Gold-nickel OROBRAZE filler metals show good high temperature strength (up to 600˚C), resistance to oxidation, and resistance to crevice corrosion on stainless steel. They produce small, exceptionally smooth fillets they produce at the joint edges that do not disturb the aerodynamic gas flow. So it is no surprise that they are often used in the aerospace industry, and we supply them according to Rolls-Royce (MSRR 9500) specification.

They are suitable for vacuum furnace brazing, as it contains no volatile elements, as well as for brazing components that operate at elevated temperatures in ultra high vacuum, such as vacuum tube devices. They are also suitable for step brazing in complex assemblies.

Typical joint gaps are in the range of 0.025-0.1mm for OROBRAZE 950 and 0.075-0.2mm for OROBRAZE 990, depending on parent metals, joint configuration and brazing methods.

Product  Au  Cu  Ag  Ni  Pd  In  Cr  Melting Range  ISO 17672 
 OROBRAZE 845  60  20  20          835 - 845 C  
 OROBRAZE 890  80  20            890 C  Au 800
 OROBRAZE 895  75  20  5          885-895 C  
 OROBRAZE 900  60  37        3    860-900 C  
 OROBRAZE 940  62.5  37.5            930-940 C  Au 625 v1
 OROBRAZE 940  82      18        950 C  Au 827 v1
 OROBRAZE 970  50  50            955-970 C  Au 503
 OROBRAZE 990  75      25        950-990 C  Au 752 v1
 OROBRAZE 998  37.5  62.5            980-998 C  Au 375 v1
 OROBRAZE 1000  40  60            980-1000 C  
 OROBRAZE 1000Cr  72      22      6  980-1000 C  
 OROBRAZE 1004  35  31.5    14  10      971-1004 C  
 OROBRAZE 1005  35  65            970-1005 C  Au 354
 OROBRAZE 1010  73.8      26.2        980-1010 C  
 OROBRAZE 1013  25  37    10  15      970-1013 C  
 OROBRAZE 1018  30  70            996-1018 C  Au 295 v1
 OROBRAZE 1025  20  78        2    975-1025 C  
 OROBRAZE 1030  35  62    3        1000-1030 C  Au 351
 OROBRAZE 1040  70    30          1030-1040 C  
 OROBRAZE 1045  70      22  5      1005-1045 C  Au 700
 OROBRAZE 1050  70      30        960-1050 C  
 OROBRAZE 1052  25  31    18  15      1017-1052 C  
 OROBRAZE 1121  50      25  25      1102-1121 C  Au 507
 OROBRAZE 1169  30      36  34      1135-1169 C  Au 300
 OROBRAZE 1270  92        8        

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