Some Properties of Ag Based Contact Materials

The following table lists just a few Ag based alloys that are obtained by a sintering process for specific contact uses
The melting point is always around 960 oC
Alloy r
[mWcm]
Brinell Hardness
[kp/mm2]
Uses
Ag (60 .... 90) %
Ni (40 ... 10) %
2,8...2,0 50 ... 130 Low Voltage
circuit breakers
Ag 88%
CdO 12%
2,4 60 ... 70 Circuit breakers
Ag 95%
SnO2 5%
2,5 50 ..60 High load relays
Ag 98 %
C 2 %
2,5 35 ... 45 Welding resistant contacts
Ag (10 ... 30) %
W (90 ... 70) %
5,0 ... 4,0 105 ... 230 Low voltage high power switches
 
The next table lists just a few Ag based alloys that are obtained by melting the constituents
The melting point varies from (800 - 1030) oC
Alloy rmWcm Brinell Hardness
(kp/mm2)
Uses
Ag 85 %
Cd 15 %
4,8 40...78 Welding resistant DC contacts
Ag (72 ...97) %
Cu (28...3) %
1,8 ... 2,1 40...140 Heavy duty relay contacts
Ag 95%
Ni 5%
1,9 50 Contacts in communication technology
Ag (70..50) %
Pd (30...50) %
15,6...32 70...190 Contacts in communication technology
Ag 20 %
Au 80 %
10 37...90 Fine contacts
Cu ca. 95 %
Co (...2,5) %
Be (1..3) %
3,5...10 100...400 Brushes, pantographs

1) S = Siemens = 1/W


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© H. Föll (Advanced Materials B, part 1 - script)