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===Silber-Wolframkarbid (SIWODUR C)-Werkstoffe===
=== Silver–Molybdenum Silber-Molybdän (SILMODUR) Materials-Werkstoffe===Ag/Mo materials with typically (SILMODUR)-Kontaktwerkstoffe mit 50-70 wtMassen-% molybdenum are usually produced by the powder metallurgical infiltration process Molybdän werdenüblicherweise auf pulvermetallurgischem Wege nach dem Tränkverfahren hergestellt (<xr id="fig:Micro structure of Ag Mo 35 65"/><!--(Fig. 2.137)--> <xr id="tab:Physical Properties of-Contact Materials Based"/><!--(Table 2.36)-->). Their contact properties are similar to those of Sie ähneln in ihren Kontakteigenschaften den Ag/W materials -Werkstoffen (<xr id="tab:Contact and Switching Properties of Contact Materials Based on Silver – Tungsten (SIWODUR), Silver–Tungsten Carbide (SIWODUR C) and Silver Molybdenum (SILMODUR)"/><!--(Table 2.37)-->). Since the molybdenum oxide is thermally less stable than tungsten oxide the self-cleaning effect of Da Molybdänoxid im Vergleich zu Wolframoxid thermisch weniger stabil ist, istdie Selbstreinigung der Ag/Mo contact surface during arcing is more pronounced and the contact resistance remains lower than that of Ag/W-Kontaktoberflächen im Schaltlichtbogen intensiverund somit der Kontaktwiderstand niedriger. The arc erosion resistance of Ag/Mo however is lower than the one for -Kontaktwerkstoffe sindweniger abbrandfest als Ag/W materials-Kontaktwerkstoffe. The main applications for Haupteinsatzgebiet vonAg/Mo contacts are in equipment protecting switching devices -Kontaktwerkstoffen sind Geräteschutzschalter (<xr id="tab:Contact and Switching Properties of Contact Materials Based on Silver – Tungsten (SIWODUR), Silver–Tungsten Carbide (SIWODUR C) and Silver Molybdenum (SILMODUR)"/><!--(Table 2.38)-->).
<figtable id="tab:Physical Properties of-Contact Materials Based">
[[File:Physical Properties of-Contact Materials Based.jpg|right|thumb|Physical Properties of Contact Materials Based on Silver–Tungsten Physikalische Eigenschaften von Werkstoffen auf Silber-Wolfram (SIWODUR)-, Silver–Tungsten Carbide Silber-Wolframkarbid (SIWODUR C) and Silver Molybdenum - und Silber-Molybdän (SILMODUR)-Basis]]
</figtable>
<xr id="fig:Micro structure of Ag W 25 75"/><!--Fig. 2.134:--> Micro structure of Gefüge von Ag/W 25/75
<xr id="fig:Micro structure of Ag WC 50 50"/><!--Fig. 2.135:--> Micro structure of Gefüge von Ag/WC 50/50
<xr id="fig:Micro structure of -Ag WC 27 C3"/><!--Fig. 2.136:--> Micro structure of Gefüge von Ag/WC27WC 27/C3
<xr id="fig:Micro structure of Ag Mo 35 65"/><!--Fig. 2.137:--> Micro structure of Gefüge von Ag/Mo 35/65
<figure id="fig:Micro structure of Ag W 25 75">
[[File:Micro structure of Ag W 25 75.jpg|left|thumb|<caption>Micro structure of Gefüge von Ag/W 25/75</caption>]]
</figure>
<figure id="fig:Micro structure of Ag WC 50 50">
[[File:Micro structure of Ag WC 50 50.jpg|left|thumb|<caption>Micro structure of Gefüge von Ag/WC 50/50</caption>]]
</figure>
<figure id="fig:Micro structure of -Ag WC 27 C3">
[[File:Micro structure of -Ag WC 27 C3.jpg|left|thumb|<caption>Micro structure of Gefüge von Ag/WC27WC 27/C3</caption>]]
</figure>
<figure id="fig:Micro structure of Ag Mo 35 65">
[[File:Micro structure of Ag Mo 35 65.jpg|left|thumb|<caption>Micro structure of Gefüge von Ag/Mo 35/65</caption>]]
</figure>
</div>
<figtable id="tab:Contact and Switching Properties of Contact Materials Based on Silver – Tungsten (SIWODUR), Silver–Tungsten Carbide (SIWODUR C) and Silver Molybdenum (SILMODUR)">
<caption>'''<!--Table 2.37:-->Contact and Switching Properties of Contact Materials Based on Silver – Tungsten Kontakt- und Schalteigenschaften der Silber-Wolfram (SIWODUR), Silver–Tungsten Carbide Silber-Wolframkarbid- (SIWODUR C) and Silver Molybdenum -,Silber-Wolframkarbid-Grafit (SIWODUR C/C) und Silber-Molybdän-(SILMODUR)-Werkstoffe'''</caption>
<table class="twocolortable">
<tr><th><p class="s12">Material/ DODUCO- Designation</p></th><th><p class="s12">Properties</p></th></tr><tr><td><p class="s12">Silver-Tungsten</p><p class="s12">SIWODUR</p><p class="s12">Silver-tungsten carbide SIWODUR C</p></td><td><p class="s12">Tendency to weld at high make currents in symmetrical pairing,</p><p class="s12">Higher contact resistance and higher temperature rise over increased number of operations through tungsten oxide and tungstate formation, especially for Ag/W,</p><p class="s12">High welding tendency of closed contacts during short circuit,</p><p class="s12">Very high arc erosion resistance, poor arc moving properties, High hardness and low formability,</p><p class="s12">Easy to braze and weld through Ag enriched backing layer</p></td></tr><tr><td><p class="s12">Silver-Tungsten Carbide plus Grafit SIWODUR C Plus</p></td><td><p class="s12">Low contact resistance and low temperature rise through graphite addition,</p><p class="s12">Lower tendency to contact welding, Lower arc erosion resistance than Ag/W</p></td></tr><tr><td><p class="s12">Silver-Molybdenum</p><p class="s12">SILMODUR</p></td><td><p class="s12">Better contact resistance stability due to less stable surface layers,</p><p class="s12">Lower arc erosion resistance than Ag/W</p></td></tr></table>