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→Silver Alloys
To improve the physical and contact properties of fine silver melt-metallurgical produced silver alloys are used ''(Table 2.13)''. By adding metal components the mechanical properties such as hardness and tensile strength as well as typical contact properties such as erosion resistance, and resistance against material transfer in DC circuits are increased <xr id="tab:tab2.14"/> (Table 2.14). On the other hand however, other properties such as electrical conductivity and chemical corrosion resistance can be negatively impacted by alloying <xr id="fig:fig2.47"/> (Fig. 2.47) and <xr id="fig:fig2.48"/> (Fig. 2.48).
<figtable id="tab:tab2.13">
'''Table 2.13: Physical Properties of Silver and Silver Alloys'''
{| class="twocolortable" style="text-align: left; font-size: 12px"
|-
!Material/<br />DODUCO-<br />Designation
!Silver Content<br />[wt%]
!Density<br />[g/cm3]
!Melting Point<br />or Range<br />[°C]
!Electrical<br />Resistivity<br />[μS.cm]
!Electrical<br />Conductivity<br />[MS/m]
!Thermal<br />Conductivity<br />[W/mK]
!Temp. Coefficient of<br />the Electr.Resistance<br />[10-3/K]
!Modulus of<br />Elasticity<br />[GPa]
|-
|Ag<br />AgNi0,15<br />ARGODUR-Spezial<br />AgCu3<br />AgNi98NiCu2<br />ARGODUR 27<br />AgCu24,5Ni0,5
|Relays,<br />Micro switches,<br />Auxiliary current switches,<br />Control circuit devices,<br />Appliance switches,<br />Wiring devices (< 20A),<br />Main switches
|'''Semi-finished Materials:''' <br />Strips, wires, contact profiles, clad contact strips, toplay profiles, seam- welded strips<br />'''Contact Parts:'''<br />Contact tips, solid and composite rivets, weld buttons; clad, welded and riveted contact parts
|-
|AgCu5<br />AgCu10<br />AgCu28
|Special applications
|'''Semi-finished Materials:'''<br />Strips, wires, contact profiles, clad contact strips, seam-welded strips<br />'''Contact parts:'''<br />Contact tips, solid contact rivets, weld buttons; clad, welded and riveted contact parts
|-
|Ag99, 5NiOMgO<br />ARGODUR 32
|Miniature relays, aerospace relays and contactors, erosion wire for injection nozzles
|Contact springs, contact carrier parts
|}
</figtable>
<xr id="fig:fig2.47"/> Fig. 2.47: Influence of 1-10 atom% of different alloying metals on the electrical resistivity of silver
Because of these mechanical properties and its high electrical conductivity ??? ARGODUR 32 is mainly used in the form of contact springs that are exposed to high thermal and mechanical stresses in relays, and contactors for aeronautic applications.
<xr id="fig:fig2.52"/> Fig. 2.52: Phase diagram of silver-copper
