Changes

Fig. 2.78: Softening of internally oxidized Ag/CdO 90/10 after annealing for 1 hr after 40% cold working

[[File:Softening of internally oxidized AgCdO9010.jpg|right|thumb|Softening of internally oxidized Ag/CdO 90/10 after annealing for 1 hr after 40% cold working]]

'''Table 2.25: Physical and Mechanical Properties as well as Manufacturing Processes and Forms of Supply of Extruded Silver Cadmium Oxide (DODURIT CdO) Contact Materials'''

Fig. 2.88: Softening of Ag/SnO₂ 92/8 PE after annealing for 1 hr after 40% cold working

[[File:Softening of AgSnO2 92 8 PE.jpg|right|thumb|Softening of Ag/SnO₂ 92/8 PE after annealing for 1 hr after 40% cold working]]

'''Table 2.26: Physical and Mechanical Properties as well as Manufacturing Processes and Forms of Supply of Extruded Silver-Tin Oxide (SISTADOX) Contact Materials'''

b) parallel to extrusion direction, 1) AgSnO₂ contact layer, 2) Ag backing layer

[[File:Micro structure of Ag SnO2 86 14 WPX.jpg|right|thumb|Micro structure of Ag/SnO₂ 86/14 WPX: a) perpendicular to extrusion direction b) parallel to extrusion direction, 1) AgSnO2 contact layer, 2) Ag backing layer]]

'''Table 2.27: Physical Properties of Powder Metallurgical Silver-Metal Oxide Materials

*'''Silver–zinc oxide (DODURIT ZnO) materials'''

Silver zinc oxide (DODURIT ZnO) contact materials with mostly 6 - 10 wt% oxide content including other small metal oxides are produced exclusively by powder metallurgy ''(Figs. 2.120 – 2.125)'' ''(Table 2.28)''. Adding Ag₂WO₄ in the process b) as described in the preceding chapter on Ag/SnO₂ has proven most effective for applications in AC relays, wiring devices, and appliance controls. Just like with the other Ag metal oxide materials, semi-finished materials in strip and wire form are used to manufacture contact tips and rivets. Because of their high resistance against welding and arc erosion Ag/ZnO materials present an economic alternative to Cd free Ag-tin oxide contact materials ''(Tables 2.30 and 2.31)''.

'''Table 2.28: Physical and Mechanical Properties as well as Manufacturing Processes and Forms of Supply of Extruded Silver-Zinc Oxide (DODURIT ZnO) Contact'''

b) parallel to extrusion direction, 1) Ag/ZnO contact layer, 2) Ag backing layer

[[File:Micro structure of Ag ZnO 92 8 WPW25.jpg|right|thumb|Micro structure of Ag/ZnO 92/8 WPW25:a) perpendicular to extrusion direction b) parallel to extrusion direction, 1) Ag/ZnO contact layer, 2) Ag backing layer]]

'''Table 2.29: Optimizing of Silver–Tin Oxide Materials Regarding their Switching Properties and Forming Behavior'''

<table border="1" cellspacing="0" style="border-collapse:collapse"><tr><td><p class="s12">Material/</p><p class="s12">Material Group</p></td><td><p class="s12">Special Properties</p></td></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>PE</p></td><td><p class="s12">Especially suitable for automotive relays</p><p class="s12">(lamp loads)</p></td><td><p class="s12">Good formability (contact rivets)</p></td></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>98/2 PX/PC</p></td><td><p class="s12">Especially good heat resistance</p></td><td><p class="s12">Easily riveted, can be directly welded</p></td></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>TOS F</p></td><td><p class="s12">Especially suited for high inductive</p><p class="s12">DC loads</p></td><td><p class="s12">Very good formability (contact rivets)</p></td></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>WPC</p></td><td><p class="s12">For AC-3 and AC-4 applications in motor</p><p class="s12">switches (contactors)</p></td><td/></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>WPD</p></td><td><p class="s12">Especially suited for severe loads (AC-4)</p><p class="s12">and high switching currents</p></td><td/></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>WPX</p></td><td><p class="s12">For standard motor loads (AC-3) and</p><p class="s12">Resistive loads (AC-1), DC loads (DC-5)</p></td><td/></tr><tr><td><p class="s12">Ag/SnO<span class="s48">2 </span>WTOSF</p></td><td><p class="s12">Especially suitable for high inductive DC</p><p class="s12">loads</p></td><td/></tr></table>

'''Table 2.30: Contact and Switching Properties of Silver–Metal Oxide Materials'''

Formability better than the one of Ag/SnO2 and Ag/ZnO materials,<br />

Use of Ag/CdO in automotive components is prohibited because of Cd toxicity,<br />Prohibition of use in consumer products and appliances in EU.

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