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→Silver-Nickel (SINIDUR) Materials
The high density produced during hot extrusion aids the arc erosion resistance of these materials <xr id="tab:tab2.21"/> (Tab 2.21) and <xr id="tab:tab2.22"/> (Tab 2.22). The typical application of Ag/Ni contact materials is in devices for switching currents of up to 100A <xr id="tab:tab2.24"/> (Table 2.24). In this range they are significantly more erosion resistant than silver or silver alloys. In addition they exhibit with nickel contents <20 wt% a low and over their operational lifetime consistent contact resistance and good arc moving properties. In DC applications Ag/Ni materials exhibit a relatively low tendency of material transfer distributed evenly over the contact surfaces <xr id="tab:tab2.23"/> (Table 2.23).
Typically Ag/Ni (SINIDUR) materials are usually produced with contents of 10-40 wt% Ni. The most widely used materials SINIDUR 10 and SINIDUR 20- and also SINIDUR 15, mostly used in north america-, are easily formable and applied by cladding ''<xr id="fig:fig2.71"/> (FigsFig. 2.71-) <xr id="fig:fig2.72"/> (Fig. 2.72) <xr id="fig:fig2.73"/> (Fig. 2.73) <xr id="fig:fig2.74"/> (Fig. 2.74)''. They can be, without any additional welding aids, economically welded and brazed to the commonly used contact carrier materials.
The (SINIDUR) materials with nickel contents of 30 and 40 wt% are used in switching devices requiring a higher arc erosion resistance and where increases
in contact resistance can be compensated through higher contact forces.
