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→Silver-Palladium Alloys
compounds significantly (Tab 2.17) and <xr id="tab:tab2.18"/> (Tab.2.18). Alloys with 40-60 wt% Pd have an even higher resistance against silver sulfide formation. At these percentage ranges however the catalytic properties of palladium can influence the contact resistance behavior negatively. The formability also decreases with increasing Pd contents.
AgPd alloys are hard, arc erosion resistant, and have a lower tendency towards material transfer under DC loads ''<xr id="tab:tab2.19"/> (Table 2.19)''. On the other hand the electrical conductivity is decreased at higher Pd contents. The ternary alloy AgPd30Cu5 has an even higher hardness which makes it suitable for use in sliding contact systems.
AgPd alloys are mostly used in relays for the switching of medium to higher loads (>60V, >2A) as shown in Table 2.20<xr id="tab:tab2.20"/>. Because of the high palladium price these formerly solid contacts have been widely replaced by multi-layer designs such as AgNi0.15 or AgNi10 with a thin Au surface layer. A broader field of application for AgPd alloys remains in the wear resistant sliding contact systems.
Fig. 2.66: Phase diagram of silver-palladium
</figtable>
<figtable id="tab:tab2.19">
'''Table 2.19: Contact and Switching Properties of Silver-Palladium Alloys'''
|High Hardness
|}
</figtable>
<figtable id="tab:tab2.20">
'''Table 2.20: Application Examples and Forms of Suppl for Silver-Palladium Alloys'''
<table border="1" cellspacing="0" style="border-collapse:collapse"><tr><td><p class="s12">Material</p></td><td><p class="s12">Application Examples</p></td><td><p class="s12">Form of Supply</p></td></tr><tr><td><p class="s12">AgPd 30-60</p></td><td><p class="s12">Switches, relays, push-buttons,</p><p class="s12">connectors, sliding contacts</p></td><td><p class="s12">Semi-finished Materials:</p><p class="s12">Wires, micro profiles (weld tapes), clad</p><p class="s12">contact strips, seam-welded strips</p><p class="s12">Contact Parts:</p><p class="s12">Solid and composite rivets, weld buttons;</p><p class="s12">clad and welded contact parts, stamped parts</p></td></tr><tr><td><p class="s12">AgPd30Cu5</p></td><td><p class="s12">Sliding contacts, slider tracks</p></td><td><p class="s12">Wire-formed parts, contact springs, solid</p><p class="s12">and clad stamped parts</p></td></tr></table>
</figtable>
===Silver Composite Materials===